Class 10 Science - Previous Year Paper SA 1 Set-5 2015

 Page 1


 
 
 
  
 
SUMMATIVE ASSESSMENT-I,2015-16 
 CLASS-X, SCINECE 41Y5TME 
 
 Time allowed: 3 hours                                Maximum Marks: 90 
 
General Instructions: 
1. The question paper comprises of two Sections, A and B. You are to attempt both the sections. 
2. All questions are compulsory. 
3. All questions of Section-A and all questions of Section-B are to be attempted separately. 
4. Question numbers 1 to 3 in section-A are one mark questions. These are to be answered in one word 
or in one sentence. 
5. Question number 4 to 6 in section-A are two marks questions. These are to be answered in about 30 
words each. 
6. Question numbers 7 to 18 in section-A are three marks questions. These are to be answered in about 
50 words each 
7. Question number 19 to 24 in section-A are five marks questions. These are to be answered in about 
70 words each. 
8. Question number 25 to 33 in section-B are multiple choice questions based on practical skills. Each 
question is a one mark question. You are to select one most appropriated response our of the four 
provided to you. 
9. Question numbers 34 to 36 in section-B are questions based on practical skills. Each question is of 
two marks. 
 
Section-A 
Q. 1 Explain synapse. 
Q. 2 Define magnetic field of a bar magnet. 
Q. 3 Name the types of energy transformations that take place in a Hydro electric power plant. 
Q. 4 Explain why respiration is considered as an exothermic reaction. Write chemical equation for 
the reaction the take place during the process of respiration.  
Q. 5 Name the constituents of bronze and write its two use. 
Q. 6 (i) The rate of breathing in terrestrial organisms is much slower than that seen in aquatic 
organisms. Why? 
(ii) How do fishes breathe? 
Q. 7 Define redox reaction. Identify the substance oxidized and the substance reduced in the 
following redox reaction: 
Page 2


 
 
 
  
 
SUMMATIVE ASSESSMENT-I,2015-16 
 CLASS-X, SCINECE 41Y5TME 
 
 Time allowed: 3 hours                                Maximum Marks: 90 
 
General Instructions: 
1. The question paper comprises of two Sections, A and B. You are to attempt both the sections. 
2. All questions are compulsory. 
3. All questions of Section-A and all questions of Section-B are to be attempted separately. 
4. Question numbers 1 to 3 in section-A are one mark questions. These are to be answered in one word 
or in one sentence. 
5. Question number 4 to 6 in section-A are two marks questions. These are to be answered in about 30 
words each. 
6. Question numbers 7 to 18 in section-A are three marks questions. These are to be answered in about 
50 words each 
7. Question number 19 to 24 in section-A are five marks questions. These are to be answered in about 
70 words each. 
8. Question number 25 to 33 in section-B are multiple choice questions based on practical skills. Each 
question is a one mark question. You are to select one most appropriated response our of the four 
provided to you. 
9. Question numbers 34 to 36 in section-B are questions based on practical skills. Each question is of 
two marks. 
 
Section-A 
Q. 1 Explain synapse. 
Q. 2 Define magnetic field of a bar magnet. 
Q. 3 Name the types of energy transformations that take place in a Hydro electric power plant. 
Q. 4 Explain why respiration is considered as an exothermic reaction. Write chemical equation for 
the reaction the take place during the process of respiration.  
Q. 5 Name the constituents of bronze and write its two use. 
Q. 6 (i) The rate of breathing in terrestrial organisms is much slower than that seen in aquatic 
organisms. Why? 
(ii) How do fishes breathe? 
Q. 7 Define redox reaction. Identify the substance oxidized and the substance reduced in the 
following redox reaction: 
 
 
 
  
 
 
2 2 2 2
M nO H Cl Mn Cl H O Cl ? ? ? ? . Also balance the above equation. 
Q. 8 State the chemical property in each case on which the following uses of baking soda are 
based: 
(i) as an antacid  
(ii) as a constituednt of baking powder 
(iii) applied on a honey bee stung area 
Q. 9 Study the following reactions and explain their reactivity. Arrange Cu, Fe, Zn and Ag in 
increasing order of their reactivity 
(i) 
4 4
C uS O F e F e SO I C u ? ? ? 
(ii) 
4 4
F e SO Z n Z nS O F e ? ? ? 
(iii) ? ?
3 3
2
2 A gN O Cu Cu N O 2 A g ? ? ? 
Q. 10 You are provided with three test tubes A, B and C which contain distilled water, acidic 
solution and basic solution respectively. If you are given blue litmus paper only, how will you 
identify the contents of each test tube? 
Q. 11 Mention the site of photosynthesis. List basic requirements for this process to occur. 
Q. 12 State the importance of tropic movements in plants. List two such movements. 
Q. 13 Mention the pathway of urine starting from the organ of its formation. Name four substances 
which are reabsorbed from the initial filtrate in the tubular part of the nephron. 
Q. 14 Calculate the resistivity of the material of a wire of length 1 m, radius 0.01 cm and of 
resistance 20 ohms. 
Q. 15 For the current carrying solenoid as shown below, draw magnetic field lines and giving 
reason explain the out of the three points A, B and C at which point the field strength is 
maximum and at which point it is minimum. 
 
Q. 16 A current of 0.2 A flows through a circuit containing a battery and a resistor R. When a wire 
of resistance 2 ohms is connected in parallel with the resistor, the current in the circuit 
becomes 1.2 A. Find the resistance of the resistor R. 
Q. 17 (i) List aby two alternatives that Anita must have suggested to her grandmother. 
(ii) How will Anita’s grandmother benefit herself and the community by not buringin the fire 
wood? Give one reason each. 
(iii) Which qualities of Anita are reflected in her way of thinking? 
Page 3


 
 
 
  
 
SUMMATIVE ASSESSMENT-I,2015-16 
 CLASS-X, SCINECE 41Y5TME 
 
 Time allowed: 3 hours                                Maximum Marks: 90 
 
General Instructions: 
1. The question paper comprises of two Sections, A and B. You are to attempt both the sections. 
2. All questions are compulsory. 
3. All questions of Section-A and all questions of Section-B are to be attempted separately. 
4. Question numbers 1 to 3 in section-A are one mark questions. These are to be answered in one word 
or in one sentence. 
5. Question number 4 to 6 in section-A are two marks questions. These are to be answered in about 30 
words each. 
6. Question numbers 7 to 18 in section-A are three marks questions. These are to be answered in about 
50 words each 
7. Question number 19 to 24 in section-A are five marks questions. These are to be answered in about 
70 words each. 
8. Question number 25 to 33 in section-B are multiple choice questions based on practical skills. Each 
question is a one mark question. You are to select one most appropriated response our of the four 
provided to you. 
9. Question numbers 34 to 36 in section-B are questions based on practical skills. Each question is of 
two marks. 
 
Section-A 
Q. 1 Explain synapse. 
Q. 2 Define magnetic field of a bar magnet. 
Q. 3 Name the types of energy transformations that take place in a Hydro electric power plant. 
Q. 4 Explain why respiration is considered as an exothermic reaction. Write chemical equation for 
the reaction the take place during the process of respiration.  
Q. 5 Name the constituents of bronze and write its two use. 
Q. 6 (i) The rate of breathing in terrestrial organisms is much slower than that seen in aquatic 
organisms. Why? 
(ii) How do fishes breathe? 
Q. 7 Define redox reaction. Identify the substance oxidized and the substance reduced in the 
following redox reaction: 
 
 
 
  
 
 
2 2 2 2
M nO H Cl Mn Cl H O Cl ? ? ? ? . Also balance the above equation. 
Q. 8 State the chemical property in each case on which the following uses of baking soda are 
based: 
(i) as an antacid  
(ii) as a constituednt of baking powder 
(iii) applied on a honey bee stung area 
Q. 9 Study the following reactions and explain their reactivity. Arrange Cu, Fe, Zn and Ag in 
increasing order of their reactivity 
(i) 
4 4
C uS O F e F e SO I C u ? ? ? 
(ii) 
4 4
F e SO Z n Z nS O F e ? ? ? 
(iii) ? ?
3 3
2
2 A gN O Cu Cu N O 2 A g ? ? ? 
Q. 10 You are provided with three test tubes A, B and C which contain distilled water, acidic 
solution and basic solution respectively. If you are given blue litmus paper only, how will you 
identify the contents of each test tube? 
Q. 11 Mention the site of photosynthesis. List basic requirements for this process to occur. 
Q. 12 State the importance of tropic movements in plants. List two such movements. 
Q. 13 Mention the pathway of urine starting from the organ of its formation. Name four substances 
which are reabsorbed from the initial filtrate in the tubular part of the nephron. 
Q. 14 Calculate the resistivity of the material of a wire of length 1 m, radius 0.01 cm and of 
resistance 20 ohms. 
Q. 15 For the current carrying solenoid as shown below, draw magnetic field lines and giving 
reason explain the out of the three points A, B and C at which point the field strength is 
maximum and at which point it is minimum. 
 
Q. 16 A current of 0.2 A flows through a circuit containing a battery and a resistor R. When a wire 
of resistance 2 ohms is connected in parallel with the resistor, the current in the circuit 
becomes 1.2 A. Find the resistance of the resistor R. 
Q. 17 (i) List aby two alternatives that Anita must have suggested to her grandmother. 
(ii) How will Anita’s grandmother benefit herself and the community by not buringin the fire 
wood? Give one reason each. 
(iii) Which qualities of Anita are reflected in her way of thinking? 
 
 
 
  
 
Q. 18 Write any three disadvantages of burning fossil fuels. 
Q. 19 (a) What is termite reaction? Giving chemical equations, explain how it is used to join railway 
tracks or cracked machine parts? 
(b) Differentiate between roasting and calcinations by giving suitable examples. 
Q. 20 (a) Define corrosion, what name is given to the corrosion of iron? 
(b) Name the colour of coating formed on silver and copper articles, when exposed to air? 
(c) List two damages caused by corrosion and suggest how corrosion can be prevented. 
Q. 21 (a) Define reflex action. State its singnificance. 
(b) How do plants respond to external stimuli? 
Q. 22 (a) State Ohm’s law. Give mathematical relation between potential difference (V), current (I) 
and resistance (R) of a conductor. Draw an electric circuit for studying ohm’s law.  
(b) When a 12 V battery is connected across an unknown resistor, 2.5 mA current flows in 
the circuit. Find the resistance of the resistor. 
Q. 23 (a) What is meant by electromagnetic indication? 
(b) Describe an activity to illustrate the phenomenon of electromagnetic indication. In three 
different manners with the help of diagram for each. 
Q. 24 What  are magnetic field lines? List three characteristics of these lines. Describe in brief an 
activity to study the magnetic field lines due to a current flowing in a circular coil. 
 
Section-B 
Q. 25 Which of the following is correct about the colour obtained on pH paper and their pH values 
in the solution taken in test tubes A, B and C respectively? 
 
 A B C 
(a) Blue, 10 Red, 2 Green, 7 
(b) Red, 2 Blue, 10 Green, 7 
(c) Green, 7 Red, 2 Blue, 10 
(d) Blue, 2 Red, 10 Green, 7 
 
Page 4


 
 
 
  
 
SUMMATIVE ASSESSMENT-I,2015-16 
 CLASS-X, SCINECE 41Y5TME 
 
 Time allowed: 3 hours                                Maximum Marks: 90 
 
General Instructions: 
1. The question paper comprises of two Sections, A and B. You are to attempt both the sections. 
2. All questions are compulsory. 
3. All questions of Section-A and all questions of Section-B are to be attempted separately. 
4. Question numbers 1 to 3 in section-A are one mark questions. These are to be answered in one word 
or in one sentence. 
5. Question number 4 to 6 in section-A are two marks questions. These are to be answered in about 30 
words each. 
6. Question numbers 7 to 18 in section-A are three marks questions. These are to be answered in about 
50 words each 
7. Question number 19 to 24 in section-A are five marks questions. These are to be answered in about 
70 words each. 
8. Question number 25 to 33 in section-B are multiple choice questions based on practical skills. Each 
question is a one mark question. You are to select one most appropriated response our of the four 
provided to you. 
9. Question numbers 34 to 36 in section-B are questions based on practical skills. Each question is of 
two marks. 
 
Section-A 
Q. 1 Explain synapse. 
Q. 2 Define magnetic field of a bar magnet. 
Q. 3 Name the types of energy transformations that take place in a Hydro electric power plant. 
Q. 4 Explain why respiration is considered as an exothermic reaction. Write chemical equation for 
the reaction the take place during the process of respiration.  
Q. 5 Name the constituents of bronze and write its two use. 
Q. 6 (i) The rate of breathing in terrestrial organisms is much slower than that seen in aquatic 
organisms. Why? 
(ii) How do fishes breathe? 
Q. 7 Define redox reaction. Identify the substance oxidized and the substance reduced in the 
following redox reaction: 
 
 
 
  
 
 
2 2 2 2
M nO H Cl Mn Cl H O Cl ? ? ? ? . Also balance the above equation. 
Q. 8 State the chemical property in each case on which the following uses of baking soda are 
based: 
(i) as an antacid  
(ii) as a constituednt of baking powder 
(iii) applied on a honey bee stung area 
Q. 9 Study the following reactions and explain their reactivity. Arrange Cu, Fe, Zn and Ag in 
increasing order of their reactivity 
(i) 
4 4
C uS O F e F e SO I C u ? ? ? 
(ii) 
4 4
F e SO Z n Z nS O F e ? ? ? 
(iii) ? ?
3 3
2
2 A gN O Cu Cu N O 2 A g ? ? ? 
Q. 10 You are provided with three test tubes A, B and C which contain distilled water, acidic 
solution and basic solution respectively. If you are given blue litmus paper only, how will you 
identify the contents of each test tube? 
Q. 11 Mention the site of photosynthesis. List basic requirements for this process to occur. 
Q. 12 State the importance of tropic movements in plants. List two such movements. 
Q. 13 Mention the pathway of urine starting from the organ of its formation. Name four substances 
which are reabsorbed from the initial filtrate in the tubular part of the nephron. 
Q. 14 Calculate the resistivity of the material of a wire of length 1 m, radius 0.01 cm and of 
resistance 20 ohms. 
Q. 15 For the current carrying solenoid as shown below, draw magnetic field lines and giving 
reason explain the out of the three points A, B and C at which point the field strength is 
maximum and at which point it is minimum. 
 
Q. 16 A current of 0.2 A flows through a circuit containing a battery and a resistor R. When a wire 
of resistance 2 ohms is connected in parallel with the resistor, the current in the circuit 
becomes 1.2 A. Find the resistance of the resistor R. 
Q. 17 (i) List aby two alternatives that Anita must have suggested to her grandmother. 
(ii) How will Anita’s grandmother benefit herself and the community by not buringin the fire 
wood? Give one reason each. 
(iii) Which qualities of Anita are reflected in her way of thinking? 
 
 
 
  
 
Q. 18 Write any three disadvantages of burning fossil fuels. 
Q. 19 (a) What is termite reaction? Giving chemical equations, explain how it is used to join railway 
tracks or cracked machine parts? 
(b) Differentiate between roasting and calcinations by giving suitable examples. 
Q. 20 (a) Define corrosion, what name is given to the corrosion of iron? 
(b) Name the colour of coating formed on silver and copper articles, when exposed to air? 
(c) List two damages caused by corrosion and suggest how corrosion can be prevented. 
Q. 21 (a) Define reflex action. State its singnificance. 
(b) How do plants respond to external stimuli? 
Q. 22 (a) State Ohm’s law. Give mathematical relation between potential difference (V), current (I) 
and resistance (R) of a conductor. Draw an electric circuit for studying ohm’s law.  
(b) When a 12 V battery is connected across an unknown resistor, 2.5 mA current flows in 
the circuit. Find the resistance of the resistor. 
Q. 23 (a) What is meant by electromagnetic indication? 
(b) Describe an activity to illustrate the phenomenon of electromagnetic indication. In three 
different manners with the help of diagram for each. 
Q. 24 What  are magnetic field lines? List three characteristics of these lines. Describe in brief an 
activity to study the magnetic field lines due to a current flowing in a circular coil. 
 
Section-B 
Q. 25 Which of the following is correct about the colour obtained on pH paper and their pH values 
in the solution taken in test tubes A, B and C respectively? 
 
 A B C 
(a) Blue, 10 Red, 2 Green, 7 
(b) Red, 2 Blue, 10 Green, 7 
(c) Green, 7 Red, 2 Blue, 10 
(d) Blue, 2 Red, 10 Green, 7 
 
 
 
 
  
 
Q. 26 Four samples A, B, C and D turns pH paper to light green, dark red, light orange and dark blue 
respectively. The correct sequence of increasing order of the pH value for samples is: 
(a) A<B<C<D 
(b) A<D<C<B 
(c) C<B<A<D 
(d) B<C<A<D 
Q. 27 The gas evolved in the set-up shown below would be: 
 
(a) Hydrogen  
(b) Carbon dioxide 
(c) Nitrogen 
(d) Oxygen 
Q. 28 Rohit observed the formation of a coating when he added the solution of copper sulphate to 
the iron nails. This deposition is of: 
(a) Iron 
(b) Copper 
(c) Iron sulphide 
(d) Sulphur 
Q. 29 Archana took solution of copper sulphate and added a metal (X). To her surprise after an 
hour the colour disappeared and the metal had reddish brown deposit. The metal could be: 
(a) Zn only  
(b) Al only 
(c) Fe only 
(d) Zn or Al 
Q. 30 In an experiment to find the equivalent resistance of two resistor, connected in series, two 
circuits are prepared. The circuit in which ammeter is connected correctly is: 
 
Page 5


 
 
 
  
 
SUMMATIVE ASSESSMENT-I,2015-16 
 CLASS-X, SCINECE 41Y5TME 
 
 Time allowed: 3 hours                                Maximum Marks: 90 
 
General Instructions: 
1. The question paper comprises of two Sections, A and B. You are to attempt both the sections. 
2. All questions are compulsory. 
3. All questions of Section-A and all questions of Section-B are to be attempted separately. 
4. Question numbers 1 to 3 in section-A are one mark questions. These are to be answered in one word 
or in one sentence. 
5. Question number 4 to 6 in section-A are two marks questions. These are to be answered in about 30 
words each. 
6. Question numbers 7 to 18 in section-A are three marks questions. These are to be answered in about 
50 words each 
7. Question number 19 to 24 in section-A are five marks questions. These are to be answered in about 
70 words each. 
8. Question number 25 to 33 in section-B are multiple choice questions based on practical skills. Each 
question is a one mark question. You are to select one most appropriated response our of the four 
provided to you. 
9. Question numbers 34 to 36 in section-B are questions based on practical skills. Each question is of 
two marks. 
 
Section-A 
Q. 1 Explain synapse. 
Q. 2 Define magnetic field of a bar magnet. 
Q. 3 Name the types of energy transformations that take place in a Hydro electric power plant. 
Q. 4 Explain why respiration is considered as an exothermic reaction. Write chemical equation for 
the reaction the take place during the process of respiration.  
Q. 5 Name the constituents of bronze and write its two use. 
Q. 6 (i) The rate of breathing in terrestrial organisms is much slower than that seen in aquatic 
organisms. Why? 
(ii) How do fishes breathe? 
Q. 7 Define redox reaction. Identify the substance oxidized and the substance reduced in the 
following redox reaction: 
 
 
 
  
 
 
2 2 2 2
M nO H Cl Mn Cl H O Cl ? ? ? ? . Also balance the above equation. 
Q. 8 State the chemical property in each case on which the following uses of baking soda are 
based: 
(i) as an antacid  
(ii) as a constituednt of baking powder 
(iii) applied on a honey bee stung area 
Q. 9 Study the following reactions and explain their reactivity. Arrange Cu, Fe, Zn and Ag in 
increasing order of their reactivity 
(i) 
4 4
C uS O F e F e SO I C u ? ? ? 
(ii) 
4 4
F e SO Z n Z nS O F e ? ? ? 
(iii) ? ?
3 3
2
2 A gN O Cu Cu N O 2 A g ? ? ? 
Q. 10 You are provided with three test tubes A, B and C which contain distilled water, acidic 
solution and basic solution respectively. If you are given blue litmus paper only, how will you 
identify the contents of each test tube? 
Q. 11 Mention the site of photosynthesis. List basic requirements for this process to occur. 
Q. 12 State the importance of tropic movements in plants. List two such movements. 
Q. 13 Mention the pathway of urine starting from the organ of its formation. Name four substances 
which are reabsorbed from the initial filtrate in the tubular part of the nephron. 
Q. 14 Calculate the resistivity of the material of a wire of length 1 m, radius 0.01 cm and of 
resistance 20 ohms. 
Q. 15 For the current carrying solenoid as shown below, draw magnetic field lines and giving 
reason explain the out of the three points A, B and C at which point the field strength is 
maximum and at which point it is minimum. 
 
Q. 16 A current of 0.2 A flows through a circuit containing a battery and a resistor R. When a wire 
of resistance 2 ohms is connected in parallel with the resistor, the current in the circuit 
becomes 1.2 A. Find the resistance of the resistor R. 
Q. 17 (i) List aby two alternatives that Anita must have suggested to her grandmother. 
(ii) How will Anita’s grandmother benefit herself and the community by not buringin the fire 
wood? Give one reason each. 
(iii) Which qualities of Anita are reflected in her way of thinking? 
 
 
 
  
 
Q. 18 Write any three disadvantages of burning fossil fuels. 
Q. 19 (a) What is termite reaction? Giving chemical equations, explain how it is used to join railway 
tracks or cracked machine parts? 
(b) Differentiate between roasting and calcinations by giving suitable examples. 
Q. 20 (a) Define corrosion, what name is given to the corrosion of iron? 
(b) Name the colour of coating formed on silver and copper articles, when exposed to air? 
(c) List two damages caused by corrosion and suggest how corrosion can be prevented. 
Q. 21 (a) Define reflex action. State its singnificance. 
(b) How do plants respond to external stimuli? 
Q. 22 (a) State Ohm’s law. Give mathematical relation between potential difference (V), current (I) 
and resistance (R) of a conductor. Draw an electric circuit for studying ohm’s law.  
(b) When a 12 V battery is connected across an unknown resistor, 2.5 mA current flows in 
the circuit. Find the resistance of the resistor. 
Q. 23 (a) What is meant by electromagnetic indication? 
(b) Describe an activity to illustrate the phenomenon of electromagnetic indication. In three 
different manners with the help of diagram for each. 
Q. 24 What  are magnetic field lines? List three characteristics of these lines. Describe in brief an 
activity to study the magnetic field lines due to a current flowing in a circular coil. 
 
Section-B 
Q. 25 Which of the following is correct about the colour obtained on pH paper and their pH values 
in the solution taken in test tubes A, B and C respectively? 
 
 A B C 
(a) Blue, 10 Red, 2 Green, 7 
(b) Red, 2 Blue, 10 Green, 7 
(c) Green, 7 Red, 2 Blue, 10 
(d) Blue, 2 Red, 10 Green, 7 
 
 
 
 
  
 
Q. 26 Four samples A, B, C and D turns pH paper to light green, dark red, light orange and dark blue 
respectively. The correct sequence of increasing order of the pH value for samples is: 
(a) A<B<C<D 
(b) A<D<C<B 
(c) C<B<A<D 
(d) B<C<A<D 
Q. 27 The gas evolved in the set-up shown below would be: 
 
(a) Hydrogen  
(b) Carbon dioxide 
(c) Nitrogen 
(d) Oxygen 
Q. 28 Rohit observed the formation of a coating when he added the solution of copper sulphate to 
the iron nails. This deposition is of: 
(a) Iron 
(b) Copper 
(c) Iron sulphide 
(d) Sulphur 
Q. 29 Archana took solution of copper sulphate and added a metal (X). To her surprise after an 
hour the colour disappeared and the metal had reddish brown deposit. The metal could be: 
(a) Zn only  
(b) Al only 
(c) Fe only 
(d) Zn or Al 
Q. 30 In an experiment to find the equivalent resistance of two resistor, connected in series, two 
circuits are prepared. The circuit in which ammeter is connected correctly is: 
 
 
 
 
  
 
(a) Circuit I only 
(b) Circuit II only 
(c) Both circuit I and II  
(d) Neither of two circuits. 
Q. 31 In the laboratory a student took a pieace of wire of resistance R and cut it into five equal 
parts. These parts are then connected in paralle. If the equivalent resistance of this 
combination is 
1
R , then the ration 
1
R / R is – 
(a) 1/25 
(b) 1/5 
(c) 5 
(d) 25  
Q. 32 The photosynthetic pigments are located in: 
(a) chloroplasts 
(b) leucoplast 
(c) nucleus 
(d) ribosome’s 
Q. 33 To show that ‘carbon dioxide is given out during respiration’ through in the above given 
diagram showing an experiments set-up, the lime water did not turn milky because : 
 
(a) Oxygen reacts with it 
(b) KOH reacts with it 
(c) KOH absorbs the 
2
C O released by the germinating seeds 
(d) KOH absorbs the 
2
O in the conical flask 
Q. 34 Aqueous solutions of sodium sulphate and barium chloride are taken in two test tubes A and 
B respectively. State the colour of the two solutions. What is likely to happen if these solution 
are mixed together. Justify your answer.