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Q. No.

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%
Level 1: 80%+
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4.4 g of an unknown gas occupies 2.24 litres of volume at NTP. The gas may be: 

1. Carbon dioxide 2. Carbon monoxide
3. Oxygen 4. Sulphur dioxide
Subtopic:  Moles, Atoms & Electrons |
 87%
Level 1: 80%+
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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 |
 86%
Level 1: 80%+
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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 |
 86%
Level 1: 80%+
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The weight of 1x1023 molecules of CuSO4.5H2O is: 

1. 34.42 g

2. 41.42 g

3. 54.44 g

4. 68.94 g

Subtopic:  Moles, Atoms & Electrons |
 73%
Level 2: 60%+
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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 |
 83%
Level 1: 80%+
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The mass of carbon present in 0.5 mole of K4[Fe(CN)6] is:

1. 1.8 g 2. 18 g
3. 3.6 g 4. 36 g
Subtopic:  Moles, Atoms & Electrons |
 73%
Level 2: 60%+
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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 |
 74%
Level 2: 60%+
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The amount of copper (in grams) that can be obtained from 100 g of copper sulphate (CuSO4) is:

1. 54.00 2. 39.81
3. 63.50 4. 159.50
Subtopic:  Moles, Atoms & Electrons |
 71%
Level 2: 60%+
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The haemoglobin from the red blood corpuscles contains approximately 0.33%  iron
by mass. The molar mass of haemoglobin is 67,200. The number of iron atoms in each molecule of haemoglobin is :
(atomic mass of iron=56):

1. 2
2. 3
3. 4
4. 5
Subtopic:  Moles, Atoms & Electrons |
 74%
Level 2: 60%+
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