Chemistry Questions and Answers for Competitive Exam

Chemistry GK Questions

Q.22 The major constituent of air is

(A) nitrogen

(B) carbon dioxide

(C) oxygen

(D) hydrogen

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Q.23 The main chemical constituent of clay is

(A) silicon oxide

(B) aluminium borosilicate

(C) zeolites

(D) aluminium silicate

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Q.24 The mineral containing both magnesium and calcium is

(A) magnesite

(B) calcite

(C) carnallite

(D) dolomite

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Q.25 The method that cannot be used for removing the permanent hardness of water is

(A) adding sodium carbonate

(B) distillation

(C) adding caustic soda

(D) boiling

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Q.26 The following are the half-lives of four active isotopes. Which one of the following is the most dangerous to handle?

(A) 3 billion years

(B) 100 years

(C) 0.01 minute

(D) 13 days

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Q.27 The gas used for artificial ripening of green fruit is

(A) ethylene

(B) ethane

(C) carbon dioxide

(D) acetylene

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Q.28 Zone refining is used for the purification of

(A) Au

(B) Ge

(C) Ag

(D) Cu

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