Chemistry - MCQs with answers - Part II
Q1. With reference to ionic compounds,consider the following statements:1) Ionic compounds are insoluble in alcohol.
2) Ionic compounds in the solid state are good conductors of electricity.
Which of these statements is /are correct ?
a) Only 1
b)Only 2
c)Both 1 and 2
d)Neither 1 nor 2
View Answer / Hide AnswerANSWER: a) Only 1
Explanation-Ionic compounds are insoluble in non –polar solvent, but are soluble in water and other polar solvent .Ionic compounds donot conduct electricity in solid state because the ions occupied fixed positions and are not able to have free movement .Thus ionic compounds are bad conductors of electricity in solid state but are good conductor of electricity in molten or dissolved state.
a) Physical change
b) Chemical change
c) Both of them
d) None
View Answer / Hide AnswerANSWER: b) Chemical change
Explanation-A chemical change is also called as chemical reaction and it is irreversible.
A) Ionization
B) Crystallization
C) Galvanization
D) Neutralization
View Answer / Hide AnswerANSWER: C) Galvanization
Explanation-Galvanization prevents rusting of iron.
a) Zinc and sulphur
b) Potassium and mercury
c) Strontium and barium
D) Chromium and nickel
View Answer / Hide AnswerANSWER: c) Strontium and barium
1) Reactions in which energy is absorbed are known as Endothermic Reactions.
2) Zinc and lead are less reactive elements than copper.
Select the incorrect option.:
a) 1 only
b) 2 only
c) Both
d) None
View Answer / Hide AnswerANSWER: b) 2 only
Explanation-zinc and lead are more reactive than copper .Thus they displace copper from its compounds.
1. Oxides of Hydrogen
2. Oxides of Nitrogen
3. Oxides of Sulphur
Which of the above causes acid rains?
a) 1 and 2
b) 3 only
c) 2 and 3
d) 1,2 and 3
View Answer / Hide AnswerANSWER: c) 2 and 3
Explanation- Acid rain is caused by emissions of compounds of ammonium,carbon, nitrogen and sulphur which reacts with the water molecules in the
Atmosphere to produce acids.
a) Dialysis
b) Electrolysis
c) Hydrolysis
d) photolysis
View Answer / Hide AnswerQ8.With reference to the uses of washing soda.1. Washing soda is used in glass , paper and soap industries.
2. It is not used in the manufacture of Borax.
3. It can be used as a cleaning agent.
4. It is unable for removing permanent hardness of water.
Choose the correct options:
a) 1,2 and 3
b) 2 and 3
c) 3 only
d) 1 an 3 only
View Answer / Hide AnswerANSWER: d) 1 an 3 only
Explanation-It is used in the production of borax that is sodium compounds and can be easily used for removing permanent hardness of water.
a) Lithium and mercury
b) Lithium and osmium
c) Aluminium and osmium
d) Aluminium and mercury
View Answer / Hide AnswerANSWER: b) Lithium and osmium
Explanation-Lithium lightest metal and osmium heaviest metal.
a) Phosphorus trichloride
b) Mercuric oxide
c) Graphite
d) Nitroglycerine
View Answer / Hide AnswerANSWER: d) Nitroglycerine
Explanation-Nitroglycerine is a heavy ,colourless , oily, explosive liquid obtained by nitrating glycerol .It is a very active compound in the manufacturing of explosives like Dynamite etc.
