Which of The following has a maximum number of molecules?

1. 7g N

2. 2g H

3. 16g NO

4. 16g O

Subtopic:  Moles, Atoms & Electrons |
 70%
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How much oxygen gas (O2) at standard temperature (0°C) and pressure (1 atm) is required to completely combust 1 liter of propane gas (C3H8) under the same conditions?

1. 7L  2. 6L
3. 5L 4. 10L
Subtopic:  Equation Based Problem |
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The product of atomic mass and specific heat of metal is approximately 6.4. This was given by:

1. Dalton's law

2. Avogadro's law

3. Newton's law

4. Dulong Petit's law

Subtopic:  Introduction |
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A gas is found to have the formula (CO)x. Its VD is 70. The value of x must be:

1. 7 

2. 4

3. 5

4. 6

Subtopic:  Moles, Atoms & Electrons |
 75%
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2 gm Iron pyrite (FeS2) is burnt with O2 to form Fe2O3 and SO2. The mass of SO2 produced is (Fe=56, S=32, O=16)

1. 2 gm

2. 2.13 gm

3. 4 gm

4. 4.26 gm

Subtopic:  Equation Based Problem |
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Oxygen contains 90% O16 and 10% O18. Its atomic mass is

(1) 17.4

(2) 16.2

(3) 16.5

(4) 17

Subtopic:  Moles, Atoms & Electrons |
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KClO3 on heating decomposes to KCl and O2. The volume of O2 at STP liberated by 0.1 mole KClO3 is

1. 4.36 L

2. 3.36 L

3. 2.36 L

4. None of these

Subtopic:  Equation Based Problem |
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At S.T.P. the density of CCl4 vapour in g/L will be nearest to [CBSE PMT 1988]

(1) 6.84

(2) 3.42

(3) 10.26

(4) 4.57

Subtopic:  Moles, Atoms & Electrons |
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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 |
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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 |
 72%
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