Chemistry - 03
11. A substance used in metallurgy to remove rock material is called
(A) flux
(B) gangue
(C) matrix
(D) slag.
(A) flux
(B) gangue
(C) matrix
(D) slag.
Correct Answer: [A] flux.
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.
(A) HF
(B) FIBr
(C) HNO3
(D) HCI.
Correct Answer: [A] HF.
13. Whose presence in drinking water is welcome?
(A) As
(B) Fe
(C) K
(D) Ca.
(A) As
(B) Fe
(C) K
(D) Ca.
Correct Answer: [C] K.
14. Phosgene is a common name of
(A) Phosphine
(B) Carbonyl chloride
(C) Phosphorus trichloride
(D) Phosphorus oxychloride.
(A) Phosphine
(B) Carbonyl chloride
(C) Phosphorus trichloride
(D) Phosphorus oxychloride.
Correct Answer: [B] Carbonyl chloride.
15. The purest form of iron is
(A) Iron turning
(B) Cast iron
(C) Wrought iron
(D) Stainless steel.
(A) Iron turning
(B) Cast iron
(C) Wrought iron
(D) Stainless steel.
Correct Answer: [C] Wrought iron.
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