SOME BASIC CONCEPT OF CHEMISTRY
SINGLE CORRECT CHOICE TYPE:
1. 0.64 g of
gas occupies a volume of 224 ml at STP. The gas could be:
a) N2O b) O2 c) SO3 d) SO2
2. Vapour
density of a gaseous substance is 4 with respect to oxygen (molecular mass=32).
The molar mass of the substance is:
a) 8 g b) 16 g c) 64 g d) 128 g
3. When burnt
in air, 14.0 g mixture of carbon and sulphur gives a mixture of CO2
and SO2 in the volume ratio of 2:1, volumes being measured at the
same condition of temperature and pressure. Moles of carbon in the mixture is:
a) 0.25 b) 0.40 c) 0.5 d) 0.75
4. Amount of
glucose required to be dissolved in 81.0 g of water to give 10% by mass of
solution is
a) 8.1 g b) 9 g c) 10 g d) 18 g
5. Consider the reaction 2A+B+3C → P+2Q. Starting with 3 moles of A, 2 moles of B and 6 moles of C,number of moles of the products P and Q would respectively be:
a) 2 and
4 b) 4 and 2 c) 3 and 1.5 d) 1.5 and 3
6. A mixture
of methane and ethane in the mole ratio of x:y, has a mean molecular mass equal
to 20. What would be the mean molecular mass of the mixture of the same gases
present in the ratio y:x:
a) 20 b) 22 c) 24 d) none of
these
7. 2.24 ml of
a gas ‘X’ is produced at STP by the action of 4.6 mg of alcohol ROH with methyl
magnesium iodide. The molecular mass of alcohol and the gas ‘X’ are
respectively :
a) 46, C2H6 b) 46, CH4 c) 4.6, C2H6 d) 0.46, CH4
8. 5.0 g of a certain
metal X forms 10.0 g of its oxide having the formula X4O6.
The atomic mass of X is :
a) 12.0
amu b) 24.0 amu c) 30.0 amu d) 32.0 amu
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