PG TRB Chemistry Previous Year Question Papers with Answers Pdf - 4
Question: 16
Which of the following type of ore is concentrated by froth floatation process?
(A) Fluoride
(B) Sulphide
(C) Carbonate
(D) Oxide
Ans: B
Sulphide
Question: 17
When aluminium reacts with alkalis, the gas liberated is
(A) Chlorine
(B) Nitrogen
(C) Oxygen
(D) Hydrogen
Ans: D
Hydrogen
Question: 18
Which of the following substance is coated on plastic tape-recorder tapes?
(A) Manganese oxide
(B) Iron sulphate
(C) Iron oxide
(D) Zinc oxide
Ans: C
Iron oxide
Question: 19
The IUPAC name of diethyl ketone is
(A) Propanone
(B) Pentan-3-one
(C) Butan-2-one
(D) Acetone
Ans: B
Pentan-3-one
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