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Science → MCQs → Chemistry MCQs from 26 to 30. Online Chemistry Questions and Answers. Basic Chemistry and general knowledge (GK) about chemistry multiple choice questions test.

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26. The major component of troposphere is
(A) Argon
(B) Carbon
(C) Hydrogen
(D) Nitrogen

27. Ozone depletion causes
(A) Blood Cancer
(B) Skin Cancer
(C) Malaria
(D) T.B

28. The pH of the acid rains is less than
(A) 5.6
(B) 5.1
(C) 4.6
(D) 4.1

29. Ozone is a ____________ gas.
(A) Reddish
(B) Greenish
(C) Bluish
(D) Yellowish

30. In water, ratio of oxygen and hydrogen by mass is
(A) 1:3
(B) 2:1
(C) 1:2
(D) 8:1

ANSWERS: CHEMISTRY MCQS
26. (D) Nitrogen
27. (B) Skin Cancer
28. (A) 5.6
29. (C) Bluish
30. (D) 8:1