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IAS/IPS Prelims Chemistry - General Knowledge Questions and Answers for UPSC Exam | Page-3

(21) Mixture of which one of the following pairs of gases is the cause of occurrence of most of the explosions in mines ?
[A] methane and air
[B] oxygen and acetylene
[C] hydrogen and oxygen
[D] carbon dioxide with ethane

Comment

Answer: Option [A]
(22) In an atom, the order of filling up of the orbitals is governed by
[A] Hund’s rule
[B] Aufbau’s principle
[C] Heisenberg’s uncertainly principle
[D] Pauli’s exclusion principle

Comment

Answer: Option [B]

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(23) In a dry cell (battery), which of the following are used as electrolytes ?
[A] Ammonium chloride and Calcium chloride
[B] Magnesium chloride and Zinc chloride
[C] Sodium chloride and Calcium chloride
[D] Ammonium chloride and Zinc chloride

Comment

Answer: Option [D]
(24) Which one of the following is a mixed fertilizer ?
[A] CAN
[B] Urea
[C] NPK
[D] Ammonium sulphate

Comment

Answer: Option [C]
(25) Consider the following statements: Cook is one of the materials of the charge added to blast furnace for the production of steel / iron. Its function is to

Of these statements

I. act as the reducing agent
II. remove silica associated with the iron ore
III. function as fuel ; to supply heat
IV. act as an oxidizing agent

[A] I and II are correct
[B] II and IV are correct
[C] I and III are correct
[D] III and IV are correct

Comment

Answer: Option [C]
(26) An aqueous solution of copper sulphate is acidic in nature because the salt undergoes
[A] dialysis
[B] hydrolysis
[C] photolysis
[D] electrolysis

Comment

Answer: Option [B]
(27) Which are the materials generally employed as solder in soldering operations in electronics ?
[A] Lead and tin
[B] Iron and tin
[C] Aluminium and iron
[D] Aluminium and lead

Comment

Answer: Option [A]
(28) What are Rubies and Sapphires chemically known as ?
[A] Lead tetroxide
[B] Silicon dioxide
[C] Boron nitride
[D] Aluminium oxide

Comment

Answer: Option [D]
(29) Which one of the following is another name of RDX ?
[A] Cyclonite
[B] Cyclohexane
[C] Cyanohydrin
[D] Dextran

Comment

Answer: Option [A]
(30) Which one of the following is used as an explosive ?
[A] Graphite
[B] Nitroglycerine
[C] Mercuric oxide
[D] Phosphorus trichloride

Comment

Answer: Option [B]

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