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Science Olympiad Test: Acids, Bases and Salts- 1 - Class 10 MCQ


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10 Questions MCQ Test - Science Olympiad Test: Acids, Bases and Salts- 1

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Science Olympiad Test: Acids, Bases and Salts- 1 - Question 1

Which of the following statements is true for acids?

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 1 - Question 1

Acids change the colour of the litmus solution from blue to red. They have a sour, vinegar-like flavour and are sticky to the touch. Bases, on the other hand, change the colour of the red litmus solution to blue. They have a bitter taste, similar to baking soda, and are slippery to the touch.

Science Olympiad Test: Acids, Bases and Salts- 1 - Question 2

Lemon juice and coffee are

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 1 - Question 2

Lemon juice and coffee are both acidic solutions. Lemon juice has a pH of 2, and coffee has a pH of 5.

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Science Olympiad Test: Acids, Bases and Salts- 1 - Question 3

When sodium hydroxide is added to ammonium carbonate salt and then a glass rod dipped in dilute hydrochloric acid is brought near the test tube, we observe

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 1 - Question 3

When a glass rod dipped in the ammonia solution is brought near HCl gas, a dense white fume of ammonium chloride is formed.
This is because ammonia reacts with the fumes of HCl to give ammonium chloride.
NH3​ + HCl → NH4​Cl

Science Olympiad Test: Acids, Bases and Salts- 1 - Question 4

Which of the following phenomenon occur, when a small amount of acid is added to water?
(i) Ionisation
(ii) Neutralization
(iii) Dilution
(iv) Salt formation

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 1 - Question 4

When a small amount of acid is added to water, a concentrated acid turns into dilute acid. This process is called dilution of acid. A dilute acid is also called an aqueous solution in which acid releases hydronium ions (H+) and undergoes ionisation. 
HCl(aq) → H+(aq) + Cl(aq)

Science Olympiad Test: Acids, Bases and Salts- 1 - Question 5

What will be pH  of solution when 0.02 mole of hydrochloric acid in 2 litres of the solution

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 1 - Question 5

Molar concentration of HCl acid solution = 0.02/2L = 0.01 mol L–1
= 10–2 mol L–1  
pH = – log [H+]
pH = – log (10–2)
pH = 2 log 10
pH = 2

Science Olympiad Test: Acids, Bases and Salts- 1 - Question 6

Solutions A, B, C and D have pH 3, 4, 6 and 8. The solution with highest acidic strength is

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 1 - Question 6

 A, B, C and D have pH 3,4,6 and 8. The solution with highest acidic strength is 6.

Science Olympiad Test: Acids, Bases and Salts- 1 - Question 7

In an attempt to demonstrate electrical conductivity through an electrolyte, the following apparatus was set up​

Which among the following statement(s) is (are) correct?
(i) Bulb will not glow because electrolyte is not acidic
(ii) Bulb will not glow because NaOH is a strong base and furnishes ions for conduction
(iii) Bulb will not glow because circuit is incomplete
(iv) Bulb will not glow because it depends upon the type of electrolytic solution

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 1 - Question 7

Option (C):- (ii) only

  • Electrical conductivity is the ability of an electrolyte to carry a current.
  • Electrolyte is actually a medium which contains ions and because of the movement of those charged ions when placed in an electric field, there would be conduction of electricity.
  • Electric current flows only in a closed circuit that would be formed here by the joining of two iron nails (which are the good conductor of electricity in the NaOH solution) with the bulb , battery and switch through the connecting wires.
  • NaOH is a strong base and furnishes strong Na+ and OH- ions which would be responsible for the electrical conductivity.
Science Olympiad Test: Acids, Bases and Salts- 1 - Question 8

Which of the following is not a mineral acid?

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 1 - Question 8

Citric acid is not a mineral acid but an organic acid present in citrus fruits

Science Olympiad Test: Acids, Bases and Salts- 1 - Question 9

Washing soda (Na2CO3.10 H2O) on exposure to air gives

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 1 - Question 9

Na2CO3.10H2O is efflorescent and loses 9 water molecules on exposure to air to give Na2CO3.H2O.

Science Olympiad Test: Acids, Bases and Salts- 1 - Question 10

Which of the following statements is not correct?

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 1 - Question 10

Most metal oxides are insoluble in water but few of them, such as Na2O and CaO dissolve in water to form alkalies and not salt and acid. Mainly group I and group II metals react with water to form hydroxides. Other metals such as iron, chromium, etc do not react with water.

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