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 |
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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): 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): The number of molecules in 2 moles of NH3 is equal to the number of molecules in 4 moles of CH4. Reason (R): Both are chemically similar species.
 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 |
80%
From NCERT
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 Assertion (A): 1 a.m.u = 1 .66 × 10−24 gram . Reason (R): The actual mass of one atom of C-12 is equal to 1.99 × 10-23 g .
 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 |
From NCERT
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 Assertion (A): The combustion of 16 g of methane gives 18 g of water. Reason (R): In the combustion of methane, water is one of the products.

 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 |
65%
From NCERT
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Given below are two statements:

 Assertion (A): One atomic mass unit is defined as one-twelfth of the mass of one carbon-12 atom. Reason (R): The carbon-12 isotope is the most abundant isotope of carbon and has been chosen as the standard.

 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 |
From NCERT
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 Assertion (A): 1 g O2 and 1 g O3  have an equal number of oxygen atoms. Reason (R): O2  and  O3  have different molar masses.
 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 |
From NCERT
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Match the following:

 COLUMN I COLUMN II A.  88 g of CO2 1.       0.25 mol B.  6.022×1023 molecules of H2O 2.       2 mol C.  5.6 L of O2 at STP 3.       3 mol D.  96 g of O2 4.       1 mol
Codes
 A B C D 1. 2 4 1 3 2. 1 2 3 4 3. 1 4 3 2 4. 4 1 3 2
Subtopic:  Moles, Atoms & Electrons |
91%
From NCERT
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