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Practice MCQ Questions and answers on Chemistry-GK

Learn and practice General Knowledge questions and answers on Chemistry with very easy and understandable explanations. GK questions are very helpful different type of competitive exams. Page-2 section-6

Each section contains 100 MCQs on Chemistry .
11
Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives
Discuss
Answer & Solution
Answer: Option A
Solution:
Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives copper at cathode and oxygen at anode.
12
Aluminium can be purified by
Discuss
Answer & Solution
Answer: Option C
Solution:
Electrolysis is a method of using a direct electric current (DC) to drive an otherwise non-spontaneous chemical reaction. Electrolysis is commercially highly important as a stage in the separation of elements from naturally occurring sources such as ores using an electrolytic cell. Aluminum is extracted from its oxide ore “Bauxite”. Electrolytic smelting of alumina was originally cost-prohibitive in part because of the high melting point of alumina, or aluminium oxide. Many minerals, however, will dissolve into a second already molten mineral, even if the temperature of the melt is significantly lower than the melting point of the first mineral. Molten cryolite was discovered to dissolve alumina at temperatures significantly lower than the melting point of pure alumina without interfering in the smelting process.
13
The aqueous solution of potassium chloride is
Discuss
Answer & Solution
Answer: Option B
Solution:
Potassium chloride (KCl) is a strong electrolyte because it completely diassociates into positively charged potassium ions.
14
Sodium is produced by the electrolysis of
Discuss
Answer & Solution
Answer: Option B
Solution:
Sodium is produced by the electrolysis of molten sodium chloride.
15
Bleaching powder is prepared by passing :
Discuss
Answer & Solution
Answer: Option A
Solution:
Bleaching powder is prepared by passing chlorine gas over dry slaked lime Ca(OH)2 by Hesenclaver method or by Bachmann method.
16
Most commonly used bleaching agent is
Discuss
Answer & Solution
Answer: Option D
Solution:
Chlorine is the most commonly used bleaching agent. Bleaching agents are compounds which are used to remove color from substances such as textiles. A bleaching agent is a material that lightens or whitens a substrate through the chemical reaction. The bleaching reactions usually involve oxidative or reductive processes that degrade color systems.
17
The acid which is secreted by the glands in the stomach wall is
Discuss
Answer & Solution
Answer: Option B
Solution:
Our stomachs have special glands in their walls.
These glands produce an acid to help us digest food.
The acid is not Sulphuric acid, Nitric acid, or Phosphoric acid.
The correct answer is Hydrochloric acid.
Hydrochloric acid is a strong acid that helps break down food in the stomach.
18
Hydrochloric acid is also known as
Discuss
Answer & Solution
Answer: Option C
Solution:
Hydrochloric acid is also known as Muriatic acid.
19
Heating of a ore below its melting point in the absence of air is known as
Discuss
Answer & Solution
Answer: Option B
Solution:
Calcination is the process in which the ore is heated below its melting point in absence of air.
20
Stainless steel is usually made by alloying the steel with
Discuss
Answer & Solution
Answer: Option C
Solution:
Stainless steel is usually made by alloying the steel with chromium and nickel.