Chemistry mcq questions and answers for competitive exams

Ramya_naidu

Posted on


Chemistry mcq questions and answers for competitive exams UPSC SSC , SSC CGL, SSC CHSL, upsc Civils , Entrance exams Online test practice online free Quiz, mock practice online
31.
Air contains maximum amount of

a
oxygen
b
nitrogen
c
hydrogen
d
carbon dioxide

32.
=The main active constituent of tea and coffee is

a
aspirin
b
nicotine
c
caffeine
d
chlorophyll

33.
Which metal is heaviest?

a
iron
b
nickle
c
osmium
d
mercury

34.
The main chemical constituent of clay is?

a
zeolites
b
silicon oxide
c
aluminium silicate
d
aluminium borosilicate

35.
The chemical used as a fixer in photography is?

a
borax
b
sodium sulphate
c
ammonium sulphate
d
sodium thiosulphate

36.
The mineral containing both magnesium and calcium is

a
calcite
b
dolomite
c
carnallite
d
magnesite

37.
Human bone does not contain

a
oxygen
b
carbon
c
calcium
d
phosphorous

38.
Oil of vitriol is

a
nitric acid
b
sulphuric acid
c
phosphoric acid
d
hydrochloric acid

39.
pH of blood is?

a
5
b
6.2
c
7.4
d
8.6

40.
The most electropositive elements among the following is :

a
Ca
b
Cs
c
Na
d
Br

41.
The Chemical Symbol of Sodium is

a
Na
b
Sd
c
So
d
Br

42.
The gas used in the manufacture of vanaspati from vegetable oil is

a
oxygen
b
nitrogen
c
hydrogen
d
carbon dioxide

43.
The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is

a
ozone
b
helium
c
oxygen
d
methane

44.
Bleaching action of chlorine is by

a
oxidation
b
reduction
c
hydrolysis
d
decomposition

45.
Water drops are spherical because of?

a
density
b
polarity
c
viscosity
d
surface tension

Rate This:
NaN / 5 - 1 votes
Profile photo for Dasaradhan Gajendra