Chemistry - MCQs with answers - Part I
Q1. Consider the following statements: Hard water is not suitable for
i. Drinking
ii. Washing clothes with soap
iii. Use in boilers
iv. Irrigating crops
Which of these statements are correct?
a) 1 and 3
b) 2 and 3
c) 1,2 and 4
d) 1,2 3 and 4
View Answer / Hide AnswerANSWER: d) 1,2 3 and 4
Hard water is salty and therefore not used for drinking. It doesnot produce lather with soaps or detergents .when boiled the salts of calcium and magnesium is deposited on the walls of the boilers which is harmful. It blocks the Xylem tissues of the plants and thus not suitable for irrigation.
remains unchanged .This is known as the :a) Law of molar masses
b) Law of Conservation of Mass
c) Law of definite proportions.
d) Law of indefinite proportions.
View Answer / Hide AnswerANSWER: (b) Law of Conservation of mass.
This process is known as …a) Roasting
b) Calcination
c) Detoxification
d) Corrosion
View Answer / Hide AnswerQ4.Non-metals form oxides which are:a) Either acidic or neutral
b) Acidic only
c) Basic only
d) Neither acidic nor neutral
View Answer / Hide AnswerANSWER: a) Either acidic or neutral
a) Zinc bromide
b) Zinc nitrate
c) Zinc oxide
d) Zinc chloride
View Answer / Hide AnswerQ6. Which of the following methods is suitable for preventing an iron frying pan from Rusting ?a) Applying paint
b) Applying grease
c) Applying a coating of zinc.
d) All of the above.
View Answer / Hide AnswerANSWER: d) All of the above.
a) Argon
b) Neon
c) Xenon
d) Nitrous oxide
View Answer / Hide AnswerANSWER: c) Xenon
Xenon is well known as an inert gas filled inside incandescent lamps. Although named after a Greek word "stranger", it is becoming less and less of a stranger among
for scientists.
mainly due to.a) The formation of hydrochloric acid when chlorine is added to water.
b) The formation of hypochlorous acid when chlorine is added to water.
c) The formation of nascent oxygen when chlorine is added to water.
d) The formation of hydrogen when chlorine is added to water.
View Answer / Hide AnswerANSWER: b) The formation of hypochlorous acid when chlorine is added to water.
When chlorine is added to water it reacts to form a pH dependent equilibrium
mixture of chlorine ,hypochlorous acid and hydrochloric acid. Depending pH hydrochlorous acid partly dissociates to hydrogen and hypochlorite ions.Disinfecting action of chlorine is due to the hydrochlorous acid .
a) Zinc
b) Copper
c) Magnesium
d) Iron
View Answer / Hide AnswerANSWER: b) Copper
Copper is not able to form amalgam while iron, zinc and magnesium are used to make amalgam.
Glass can be etched or scratched by
1. Diamond
2. Hydrofluoric acid
3. Aquaregia
4. Conc. sulphuric acid
a) 1 and 4
b) 2 and 3
c) 1 and 2
d) 2 and 4
View Answer / Hide AnswerANSWER: c) 1 and 2
Diamond is the hardest element of the world and therefore is used to cut or scratch the glass whereas hydrofluoric acid is used for writing on the glass.
