Which among the following has maximum number of molecules?

1. 7g N₂ 

2. 2g H₂ 

3. 16g NO₂ 

4. 16g O₂ 

What volume of  oxygen gas (O₂) measured at $0°\mathrm{C}$ and 1 atm,

is needed to burn completely 1L of

propane gas (C₃H₈) measured under the same conditions?

(1) 7L 

(2) 6L

(3) 5L

(4) 10L

The product of atomic mass and specific heat of a 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

A gas is found to have the formula (CO)x. Its Vapour Density is 70. The value of x must be:

(a) 7 

(b) 4

(c) 5

(d) 6

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

Oxygen consists of two isotopes:

Calculate the average atomic mass of oxygen based on its isotopic composition:

1. 17.4

2. 16.2

3. 16.5

4. 17

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

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

A 4.4 g sample of an unknown gas occupies a volume of 2.24 L at NTP. Identify the gas from the following options:

1. Carbon dioxide

2. Carbon monoxide

3. Oxygen

4. Sulphur dioxide

The mass of carbon present in 0.5 mole of K₄[Fe(CN)₆] is: