Friday, April 26, 2019

WBCS Polity and Constitution MCQs Prelims and Mains

Quiz on General Science (Chemistry) For WBCS Prelims Exams P3


Chemistry - 03

11. A substance used in metallurgy to remove rock material is called
(A) flux
(B) gangue
(C) matrix
(D) slag.

Correct Answer: [A] flux.
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12. The compound that can not be kept in glass vessel because it reacts with glass is
(A) HF
(B) FIBr
(C) HNO3
(D) HCI.

Correct Answer: [A] HF.
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13. Whose presence in drinking water is welcome?
(A) As
(B) Fe
(C) K
(D) Ca.

Correct Answer: [C] K.
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14. Phosgene is a common name of
(A) Phosphine
(B) Carbonyl chloride
(C) Phosphorus trichloride
(D) Phosphorus oxychloride.

Correct Answer: [B] Carbonyl chloride.
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15. The purest form of iron is
(A) Iron turning
(B) Cast iron
(C) Wrought iron
(D) Stainless steel.

Correct Answer: [C] Wrought iron.
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