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%
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The number of  moles  present in 2.5 litres of 0.2 M  H2SO4 are:

1. 0.25

2. 0.5

3. 0.75

4. 0.2

Subtopic:  Moles, Atoms & Electrons |
 85%
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Mark the species among the following that contains the highest number of atoms.

1. 4 g He

2. 46 g Na

3. 0.40 g Ca

4. 12 g He

Subtopic:  Moles, Atoms & Electrons |
 85%
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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 |
 81%
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The formula of an acid is HXO2. The mass of 0.0242 moles of the acid is 1.657 g.
The atomic weight of X is:

1. 35.5 2. 28.1
3. 128 4. 19.0
Subtopic:  Moles, Atoms & Electrons |
 73%
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 The maximum number of molecules is present in which of the following? 

1. 15 L of H2 gas at STP

2. 5 L of N2 gas at STP

3. 0.5 g of H2 gas

4. 10 g of O2 gas

Subtopic:  Moles, Atoms & Electrons |
 72%
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An organic substance containing C, H, and O gave the following percentage composition :

C = 40.687%, H = 5.085% and O = 54.228%. The vapour density of this organic substance is 59.

The molecular formula of the compound will be:

1. C4H6O4

2. C4H6O2

3. C4H4O2

4. None of the above

Subtopic:  Moles, Atoms & Electrons |
 70%
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The number of valence electrons present in 0.53 grams of Na2COis:

1. 3.01×1023

2. 7.22×1022

3. 12.046×1023

4. 6.023×1023

Subtopic:  Moles, Atoms & Electrons |
 60%
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An element X has the following isotopic composition,

200X : 90%, 199X : 8.0%, 202X : 2.0%

The weighted average atomic mass of the naturally occurring element X is closest to: 

1. 205 u 2. 220 u
3. 196 u 4. 200 u
Subtopic:  Moles, Atoms & Electrons |
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100 mL of H2SO4 solution having molarity of 1M and density 1.5 g/mL is mixed with 400 mL of water. The molarity of the H2SO4 solution will be: (final density is 1.25 g/mL )

1. 4.4 M 2. 0.145 M
3. 0.52 M 4. 0.227 M
Subtopic:  Moles, Atoms & Electrons |
 55%
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