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Class 10 NCERT Chemistry MCQs for UPPSC (UP) Exam
It covers all Important Questions with answers on Class 10 NCERT Chemistry for the UPPSC (UP) exam. The questions are based on important topics. Details about the questions:- Topic: Class 10 NCERT Chemistry
- Type of Questions: MCQs with solutions
- Number of Questions: 50
- You can attempt them on EduRev to score high in UPPSC (UP) exam.
Which of the following does not conduct electricity?- a)Sodium hydroxide
- b)Rain water
- c)Hydrochloric acid
- d)Distilled water
Correct answer is option 'D'. Can you explain this answer?
Which of the following does not conduct electricity?
a)
Sodium hydroxide
b)
Rain water
c)
Hydrochloric acid
d)
Distilled water
 | Gaurav Kumar answered |
Distilled water do not conduct electricity. The reason is that a liquid conducts electricity is by the positively or negatively charged ions that are actually moving from one of the electrodes to the other, carrying charge (electricity) with them.
Fe2O3 + 2Al → Al2O3 + 2Fe
The above reaction is an example of a:- a)Decomposition reaction
- b)Combination reaction
- c)Displacement reaction
- d)Single displacement reaction
Correct answer is option 'C'. Can you explain this answer?
Fe2O3 + 2Al → Al2O3 + 2Fe
The above reaction is an example of a:
The above reaction is an example of a:
a)
Decomposition reaction
b)
Combination reaction
c)
Displacement reaction
d)
Single displacement reaction
 | Anushka Chopra answered |
The given equation is a displacement reaction in which Fe of Fe2O3 has been displaced by Al. Hence, (c) is the correct option.
How many elements were known when Mendeleev started his work on his periodic table?- a)63
- b)55
- c)69
- d)45
Correct answer is option 'A'. Can you explain this answer?
How many elements were known when Mendeleev started his work on his periodic table?
a)
63
b)
55
c)
69
d)
45
 | Nisha Choudhury answered |
There were 63 known elements in 1860 when Mendeleev published his Periodic Table. CIENTISTS HAD IDENTIFIED over 63 elements by Mendeleev's time.
The best conductor of electricity among the following is:- a)Hg (Mercury)
- b)Al (Aluminum)
- c)Ag (Silver)
- d)Au (Gold)
Correct answer is option 'C'. Can you explain this answer?
The best conductor of electricity among the following is:
a)
Hg (Mercury)
b)
Al (Aluminum)
c)
Ag (Silver)
d)
Au (Gold)
 | Avinash Patel answered |
Metals are good conductors of electricity. silver is found in in pure form from the earth. so In the given options all are metals. Among them silver is the best conductor of electricity after second best conductor of electricity is gold.
Metal which is a poor conductor of heat is:- a)Zinc
- b)Lead
- c)Gold
- d)Copper
Correct answer is option 'B'. Can you explain this answer?
Metal which is a poor conductor of heat is:
a)
Zinc
b)
Lead
c)
Gold
d)
Copper
| | Anjana Khatri answered |
Although metals are supposed to be good conductors of electricity and heat,metals like mercury, lead, alloys of iron and chromium, titanium and stainless steel are poor conductors when compared to silver, copper and gold.
Among the following metals, the metal that can displace zinc from zinc sulphate solution is:- a)Magnesium
- b)Copper
- c)Lead
- d)Silver
Correct answer is option 'A'. Can you explain this answer?
Among the following metals, the metal that can displace zinc from zinc sulphate solution is:
a)
Magnesium
b)
Copper
c)
Lead
d)
Silver
| | Arun Sharma answered |
Magnesium is more reactive than zinc therefore it can displace zinc from its solution.
Which of the following is an example of displacement reaction?- a)4 Na+ O2 → 2 Na2O
- b)2 Cu + O2 → 2 CuO
- c)Mg + 2 HCl → MgCl2 + H2
- d)N2 + 3 H2 → 2 NH3
Correct answer is option 'C'. Can you explain this answer?
Which of the following is an example of displacement reaction?
a)
4 Na+ O2 → 2 Na2O
b)
2 Cu + O2 → 2 CuO
c)
Mg + 2 HCl → MgCl2 + H2
d)
N2 + 3 H2 → 2 NH3
 | Orion Classes answered |
It is a single replacement reaction.
Mg + 2HCl → MgCl2 + H2
Mg + 2HCl → MgCl2 + H2
Which of the following metals comes above zinc in reactivity series?- a)Silver
- b)Copper
- c)Aluminium
- d)Iron
Correct answer is option 'C'. Can you explain this answer?
Which of the following metals comes above zinc in reactivity series?
a)
Silver
b)
Copper
c)
Aluminium
d)
Iron
 | Karthik murthy answered |
Reactivity Series:
The reactivity series is a list of metals arranged in order of their decreasing reactivity. The most reactive metal is placed at the top and the least reactive metal is placed at the bottom of the series.
The reactivity series of metals is as follows:
Potassium > Sodium > Calcium > Magnesium > Aluminium > Zinc > Iron > Lead > Copper > Silver > Gold
Explanation:
Aluminium is more reactive than zinc and is placed above zinc in the reactivity series. This is because aluminium has a stronger tendency than zinc to lose electrons and form positive ions.
When aluminium is exposed to air, it reacts with oxygen to form a layer of aluminium oxide. This layer of oxide is very thin and is also very stable. It prevents further reaction of aluminium with oxygen and protects the metal from corrosion.
Zinc, on the other hand, reacts with oxygen in the air to form zinc oxide. However, the layer of oxide formed on zinc is not as stable as the layer of oxide formed on aluminium. Therefore, zinc is more susceptible to corrosion than aluminium.
Conclusion:
In conclusion, aluminium is more reactive than zinc and is placed above zinc in the reactivity series. This means that aluminium can displace zinc from its compounds in a chemical reaction, but zinc cannot displace aluminium from its compounds.
The reactivity series is a list of metals arranged in order of their decreasing reactivity. The most reactive metal is placed at the top and the least reactive metal is placed at the bottom of the series.
The reactivity series of metals is as follows:
Potassium > Sodium > Calcium > Magnesium > Aluminium > Zinc > Iron > Lead > Copper > Silver > Gold
Explanation:
Aluminium is more reactive than zinc and is placed above zinc in the reactivity series. This is because aluminium has a stronger tendency than zinc to lose electrons and form positive ions.
When aluminium is exposed to air, it reacts with oxygen to form a layer of aluminium oxide. This layer of oxide is very thin and is also very stable. It prevents further reaction of aluminium with oxygen and protects the metal from corrosion.
Zinc, on the other hand, reacts with oxygen in the air to form zinc oxide. However, the layer of oxide formed on zinc is not as stable as the layer of oxide formed on aluminium. Therefore, zinc is more susceptible to corrosion than aluminium.
Conclusion:
In conclusion, aluminium is more reactive than zinc and is placed above zinc in the reactivity series. This means that aluminium can displace zinc from its compounds in a chemical reaction, but zinc cannot displace aluminium from its compounds.
Identify the amphoteric oxide from the following:- a)MgO
- b)Na2O
- c)Al2O3
- d)K2O
Correct answer is option 'C'. Can you explain this answer?
Identify the amphoteric oxide from the following:
a)
MgO
b)
Na2O
c)
Al2O3
d)
K2O
| | Arun Sharma answered |
Amphoteric metal oxides react with both acids as well as bases to produce salt and water.
Aluminium oxide is an amphoteric oxide because it reacts with acids as well as bases and form salts and water.
Al2O3 + 6HCl → 2AlCl3 + 3H2O (Basic nature)
Aluminium Hydrochloric Aluminium Water
oxide acid chloride
Al2O3 + 2NaOH → 2NaAlO2 + H2O (Acidic nature)
Aluminium Sodium Sodium Water
oxide Hydroxide aluminate
Identify ‘X’ in the reaction: 2HCl + CuO → X + H2O- a)CuCl
- b)Cu(OH)2
- c)CuCl2
- d)HOCl
Correct answer is option 'C'. Can you explain this answer?
Identify ‘X’ in the reaction: 2HCl + CuO → X + H2O
a)
CuCl
b)
Cu(OH)2
c)
CuCl2
d)
HOCl
 | Vikram Kapoor answered |
When copper oxide and dilute hydrochloric acid are mixed the blue green solution is formed.
The reaction is :-
CuO + 2HCl → CuCl2 + H2O
The reaction is :-
CuO + 2HCl → CuCl2 + H2O
All metals exist as solid at room temperature except the metal ‘X’. Name the metal “X’.- a)Tungsten
- b)Mercury
- c)Gold
- d)Potassium
Correct answer is option 'B'. Can you explain this answer?
All metals exist as solid at room temperature except the metal ‘X’. Name the metal “X’.
a)
Tungsten
b)
Mercury
c)
Gold
d)
Potassium
| | Ananya Das answered |
It is the only metal that is liquid at room temperature. It has the lowest melting point and boiling point of any other metal. It has low thermal conductivity, and a quite low electrical conductivity. It is the only metal that doesn’t form diatomic molecules in the gaseous phase.
Which metal is present in Calcium Hydroxide?- a)C
- b)O
- c)Ca
- d)H
Correct answer is option 'C'. Can you explain this answer?
Which metal is present in Calcium Hydroxide?
a)
C
b)
O
c)
Ca
d)
H
| | Amit Sharma answered |
Calcium hydroxide Ca ( OH) 2 , has calcium ( Ca) which is a metal.
The colour of phenolphthalein in acids is:- a)Colourless
- b)Red
- c)Pink
- d)Blue
Correct answer is option 'A'. Can you explain this answer?
The colour of phenolphthalein in acids is:
a)
Colourless
b)
Red
c)
Pink
d)
Blue
 | Krishna Iyer answered |
Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colourless in acidic solutions and magenta in basic solutions.
Carbon dioxide is an example of:- a)Amphoteric oxide
- b)Acidic oxide
- c)Basic oxide
- d)Neutral oxide
Correct answer is option 'B'. Can you explain this answer?
Carbon dioxide is an example of:
a)
Amphoteric oxide
b)
Acidic oxide
c)
Basic oxide
d)
Neutral oxide
| | Gaurav Kumar answered |
Acid oxides is a complex chemical substance oxides, which form a salt with the chemical reactions with bases or basic oxides and do not react with acidic oxides.
Examples of acidic oxides can be:
CO2 (all known carbon dioxide), P2O5 - oxide of phosphorus (formed in air if burns white phosphorus), SO3 - oxide of sulfur (VI) is a substance used for sulfuric acid.
Examples of acidic oxides can be:
CO2 (all known carbon dioxide), P2O5 - oxide of phosphorus (formed in air if burns white phosphorus), SO3 - oxide of sulfur (VI) is a substance used for sulfuric acid.
The colour of anhydrous copper sulphate is:- a)White
- b)Blue
- c)Red
- d)Yellow
Correct answer is option 'A'. Can you explain this answer?
The colour of anhydrous copper sulphate is:
a)
White
b)
Blue
c)
Red
d)
Yellow
 | Rahul Kapoor answered |
The answer is b.
The crystals of hydrated copper sulphate salt are blue in colour. When heated, the salt loses its water of crystallization and turns white.
Which of the following non-metal is good conductor of electricity?- a)Graphite
- b)Phosphorus
- c)Hydrogen
- d)Bromine
Correct answer is option 'A'. Can you explain this answer?
Which of the following non-metal is good conductor of electricity?
a)
Graphite
b)
Phosphorus
c)
Hydrogen
d)
Bromine
| | Gaurav Kumar answered |
Carbon, in the form of Graphite is a good conductor of electricity. It conducts heat and electricity like a metal or a metalloid.
The Law of Octaves was applicable only upto element ________.- a)Sodium
- b)Calcium
- c)Zinc
- d)Copper
Correct answer is option 'B'. Can you explain this answer?
The Law of Octaves was applicable only upto element ________.
a)
Sodium
b)
Calcium
c)
Zinc
d)
Copper
| | Vikram Kapoor answered |
The major limitations of Newlands' law of octaves were :
It was applicable to only lighter elements having atomic masses upto 40 u, i.e., upto calcium. After calcium, the first and the eighth element did not have similar properties. For example chromium (Cr) and yttrium (Y) are the first and the eighth element placed in the same column but they have entirely different properties.
It was applicable to only lighter elements having atomic masses upto 40 u, i.e., upto calcium. After calcium, the first and the eighth element did not have similar properties. For example chromium (Cr) and yttrium (Y) are the first and the eighth element placed in the same column but they have entirely different properties.
What happens when non-metals react with water?a) Hydrogen gas is formedb) Carbon dioxide gas is formedc) Non-metals do not react with waterd) None of these.Correct answer is option 'C'. Can you explain this answer?
b) Carbon dioxide gas is formed
c) Non-metals do not react with water
d) None of these.
Correct answer is option 'C'. Can you explain this answer?
 | Pooja Shah answered |
Non - metals do not react with water to evolve hydrogen gas. ( no reaction)
Identify the type of reaction: HCl + NaOH → NaCl + H2O- a)Combination reaction
- b)Double decomposition reaction
- c)Decomposition reaction
- d)Neutralisation reaction
Correct answer is option 'D'. Can you explain this answer?
Identify the type of reaction: HCl + NaOH → NaCl + H2O
a)
Combination reaction
b)
Double decomposition reaction
c)
Decomposition reaction
d)
Neutralisation reaction
| | Krishna Iyer answered |
Reaction of a strong acid with strong base is called neutralization reaction which produces salt and water,
HCl + NaOH → NaCl + H2O
This equation is already balanced.
P, Q, R are elements of Dobereiner’s triads. If the atomic mass of P is 7 and that of Q is 23, What will be the atomic mass of R?- a)15.0
- b)40.0
- c)30.0
- d)39.0
Correct answer is option 'D'. Can you explain this answer?
P, Q, R are elements of Dobereiner’s triads. If the atomic mass of P is 7 and that of Q is 23, What will be the atomic mass of R?
a)
15.0
b)
40.0
c)
30.0
d)
39.0
| | Gaurav Kumar answered |
In a Dobereiner's traid, the atomic mass of the middle element is roughly the average of the atomic mass of the other 2 elements. Thus,
Atomic mass of Q = (at. mass of P+ at. mass of R) /2
⇒ 23 = 7+ m(R) /2
⇒ 23*2 = 7+ m(R)
⇒ 46 -7 = m(R)
⇒ atomic mass of R = 39
Atomic mass of Q = (at. mass of P+ at. mass of R) /2
⇒ 23 = 7+ m(R) /2
⇒ 23*2 = 7+ m(R)
⇒ 46 -7 = m(R)
⇒ atomic mass of R = 39
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