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Q. No.
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 |
 92%
From NCERT
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