Engineering Entrance Chemistry Questions

1. The weight of 10 x 1023 atoms of
oxygen is
(a) 32 gm (b) 16 amu (c) 5.34 amu
(d) 5.34 gm (e) None
2. 1.76gms' of CO2 and 1120m1 of CO at
STP are taken in an empty vessel, calculate the total mmiber of moles of molecules present in the vessel
(a) 9 x 1023 moles ()) 9 x 10-2moles
(c) 9 x 6 x 1023 moles
(d) 0.9 moles (e) None
3. 1.2grns of an inorganic base furnishes
1.02gms of hydroxyl ions during a neutralisation reaction in aqueous medium. The equivalent weight of the base is
(a) 120 (b) 56 (c) 20
(d) 10 (e) 40
4. 8.4gms of carbonate of metal on
strong heating gives 4gms of its oxide. Find the equivalent weight of the metal
(a) 20 (b) 6 (c) 24 (d) 12 (e) 32
5. An hydrocarbon contains 85.8% of
carbon. The weight of 5.6 litres of the same gas at STP is found to be 14gms, The molecular formula of the hydrocarbon is
(a) C21-12 (b) C2114
(c) C4H 1 a (d) C41-18 (e) C3H8
6. 1.12m1 of a gas is produced at ATP by
the action of 4.12 mg of an alcohol ROH with methyl magnesiusm iodide. The molecular mass of alcohol is
(a) 8.24 (b) 0.824 (c) 82.4
(d) 824 (e) None
7. 27g of aluminium will react
completely with
(a) 8 g of oxygen (b) 24 g of oxygen
(c) 16 g of oxygen
(d) 48 g of oxygen (e) None


8. The compound with identical crystal
structures and analogous chemical formulae are called
(a) allotropes (b) isotones (c) isomers
(d) isomorphs (e) isodiaphers
9. On reaction with hydrogen 3.6g of an
oxide of metal leaves 3.2g of metallic residue. If the atomic mass of metal is
64, the formula of metal oxide is
(a) M203 (b) M20 (c) MO
(d) MO2 (e) M30
10. The number of oxygen atoms in 0.2mole of decahydrate sodium carbonate is
(a) 1.56 x 1024 (b) 1.56 x 1023
(c) 1.56 x 1025 (d) 3.12 x 1024
(e) None
11. , Which of the following pairs of
compound illustrate law of multiple proportion?
(a) KOH, CsOH (b) H20, D20
(c) ethane, benzene (d) KC1, K.Br
(e) None
12. The percentage of hydrogen in water
and hydrogen peroxide is 11.1 and 5.9% respectively. These figures illustrate
(a) Law of multiple proportions (b)Law of conservation of proportions
(c) Law of reciprocal proportions
(d) Law of combining volumes
(e) Law of constant composition
13. A certain gaseous mixture contains
methane and sulphur dioxide in ratio of 1 : 8 by mass. The ratio of the number of molecules is
(a) 1 : 8 (b) 1 : 2 (c) I: 1
(d) 2 : 1 (e) 3 : 1
14. The balancing of chemical equation is
based on
(a)Law of combining volumes
(b) Law of multiple proportions
(c)Law of conservation of mass
(d) Law of definite proportion
(e) All of these