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
Ans . A
Q.23 The main chemical constituent of clay is
(A) silicon oxide
(B) aluminium borosilicate
(C) zeolites
(D) aluminium silicate
Ans . D
Q.24 The mineral containing both magnesium and calcium is
(A) magnesite
(B) calcite
(C) carnallite
(D) dolomite
Ans . D
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
Ans . D
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
Ans . C
Q.27 The gas used for artificial ripening of green fruit is
(A) ethylene
(B) ethane
(C) carbon dioxide
(D) acetylene
Ans . A
Q.28 Zone refining is used for the purification of
(A) Au
(B) Ge
(C) Ag
(D) Cu
Ans . B
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Rajesh Bhatia
A Writer, Teacher and GK Expert. I am an M.A. & M.Ed. in English Literature and Political Science. I am highly keen and passionate about reading Indian History. Also, I like to mentor students about how to prepare for a competitive examination. Share your concerns with me by comment box. Also, you can ask anything at linkedin.com/in/rajesh-bhatia-7395a015b/.
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