General Chemistry – 1 – 1

1. Chemical formula for water is :

(a) NaA1O2
(b) H2O
(c) Al2O3
(d) CaSiO3

ANSWER

EXPLANATION

2. Brass gets discolored in air because of the presence of which of the following gases in air ?

(a) Oxygen
(b) Hydrogen sulphide
(c) Carbon dioxide
(d) Nitrogen

ANSWER

EXPLANATION

3. Which of the following metals forms an amalgam with other metals ?

(a) Tin
(b) Mercury
(c) Lead
(d) Zinc

ANSWER

EXPLANATION

4. Quartz crystals normally used in quartz clocks etc. is chemically :

(a) silicon dioxide
(b) germanium oxide
(c) a mixture of germanium oxide and silicon dioxide
(d) sodium silicate

ANSWER

EXPLANATION

5. Bromine is a :

(a) black solid
(b) red liquid
(c) colourless gas
(d) highly inflammable gas

ANSWER

EXPLANATION


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