Which has maximum number of molecules?

(a) 7g N

(b) 2g H

(c) 16g NO

(d) 16g O

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What volume of  oxygen gas (O2) measured at 0°C and 1 atm, is needed to burn completely 1L of  propane gas (C3H8) measured under the same conditions?

(a) 7L 

(b) 6L

(c) 5L

(d) 10L

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The product of atomic mass and specific heat of a metal is approximately 6.4. This was given by:
(a) Dalton's law
(b) Avogadro's law
(c) Newton's law
(d) Dulong Petit's law

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

(a) 7 

(b) 4

(c) 5

(d) 6

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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

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Oxygen contains 90% O16 and 10% O18. Its atomic mass is [KCET 1998]

(1) 17.4

(2) 16.2

(3) 16.5

(4) 17

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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

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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

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4.4 g of an unknown gas occupies 2.24 litres of volume at NTP. The gas may be [MP PMT 1995]

(1) Carbon dioxide

(2) Carbon monoxide

(3) Oxygen

(4) Sulphur dioxide

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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

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