Which has maximum number of molecules?

(a) 7g N_{2 }

(b) 2g H_{2 }

(c) 16g NO_{2 }

(d) 16g O_{2 }

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What volume of oxygen gas (O_{2}) measured at $0\xb0\mathrm{C}$ and 1 atm, is needed to burn completely 1L of propane gas (C_{3}H_{8}) 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 (FeS_{2}) is burnt with O_{2} to form Fe_{2}O_{3} and SO_{2}. The mass of SO_{2} 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% O^{16} and 10% O^{18}. Its atomic mass is **[KCET 1998]**

(1) 17.4

(2) 16.2

(3) 16.5

(4) 17

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KClO_{3} on heating decomposes to KCl and O_{2}. The volume of O_{2 }at STP liberated by 0.1 mole KClO_{3 }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 CCl_{4} 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 K_{4}[Fe(CN)_{6}] is

(1) 1.8 g

(2) 18 g

(3) 3.6 g

(4) 36 g

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