# Assertion (A): The molarity of pure water is 55.55 M at 298 K. Reason (R): Molarity is temperature-dependent.   1. Both (A) and (R) are true and (R) is the correct explanation of (A). 2. Both (A) and (R) are true but (R) is not the correct explanation of (A). 3. (A) is true but (R) is false. 4. (A) is false but (R) is true.

Subtopic:  Concentration Based Problem |
58%
From NCERT
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Given below are two statements:
 Assertion (A): Equivalent volume of H2 is 11.2 L at 1 atm and 273 K. Reason (R): 1/2 mole H2 has produced when 1 mole of H+ (aq.) accepted 1 mole of e-.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 (A) is false but (R) is true.

Subtopic:  Moles, Atoms & Electrons |
60%
From NCERT
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 Assertion (A): Both 106 g of sodium carbonate and 12 g of graphite have the same number of carbon atoms. Reason (R): Both 106 g of sodium carbonate and 12 g of graphite contain 1 g atom (1 mole) of carbon atoms.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.

Subtopic:  Moles, Atoms & Electrons |
73%
From NCERT
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Given below are two statements:
 Assertion (A): Atoms can neither be created nor destroyed. Reason (R): Under similar conditions of temperature and pressure, an equal volume of gases do not contain an equal number of molecules.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.
Subtopic:  Introduction |
69%
From NCERT
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 Assertion (A): 233 g of BaSO4 is equal to one mole of BaSO4 Reason (R): One mole of BaSO4 is obtained when one mole of BaCl2 is treated with 1 litre of 1M H2SO4

 1 Both (A) and (R) are true, and (R) is the correct explanation of (A). 2 Both (A) and (R) are true, but (R) is not the correct explanation of (A). 3 (A) is true, but (R) is false. 4 Both (A) and (R) are false.
Subtopic:  Introduction |
63%
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 Assertion (A): When 100 ml 1 M H2SO4 is mixed with 200 ml 1 M NaOH, the solution becomes neutral. Reason (R): Moles of H2SO4 are equal to moles of NaOH.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.
Subtopic:  Equation Based Problem |
51%
From NCERT
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 Assertion (A): The number of molecules in 1g NH3 is more than 1g N2 . Reason (R): 1mole of NH3 as well as 1 mole of N2 contains $$6.023 \times 10^{23}$$ atoms.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.
Subtopic:  Moles, Atoms & Electrons |
From NCERT
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Assertion: Specific gravity is dimensionless.
Reason: Specific gravity is the density of a substance measured with respect to density of water at 4°C.

1. Both statements are true and the reason is the correct explanation of the assertion.
2. Both statements are true but the reason is not the correct explanation of the assertion.
3. Assertion is true and the reason is false.
4. Assertion is false and reason is true.

Subtopic:  Introduction |
68%
From NCERT
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One of the statements of Dalton's atomic theory is given below:

"Compounds are formed when atoms of different elements combine in a fixed ratio"

Which of the following laws is not related to this statement?

(a) Law of conservation of mass

(b) Law of definite proportions

(c) Law of multiple proportions

1. (a), (d)

2. (b), (c)

3. (c), (d)

4. (b), (d)

Subtopic:  Introduction |
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 Assertion (A): When 4 moles of H2 reacts with 2 moles of O2, then 4 moles of water are formed. Reason (R): O2 will act as a limiting reagent.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.

Subtopic:  Equation Based Problem |
56%
From NCERT
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