PG TRB Chemistry Model Question Paper with Answer - 3
Question: 11
Manganese steel is used in making
(A) Electromagnets
(B) Razor blades
(C) Burglar proof safety lockers
(D) Surgical instrument
Ans: C
Burglar proof safety lockers
Question: 12
Oils are purified by
(A) Fractional distillation
(B) Steam distillation
(C) Vacuum distillation
(D) Crystallization
Ans: B
Steam distillation
Question: 13
In chemical terms, what are alums used for purifying water for drinking purposes?
(A) Hydrated chlorides
(B) Double nitrate
(C) Nitrates of aluminium
(D) Double sulphates
Ans: D
Double sulphates
Question: 14
What is iodized table salt?
(A) a heterogeneous mixture
(B) a homogeneous mixture
(C) a compound
(D) an element
Ans: B
a homogeneous mixture
Question: 15
Mark the halogen that does not give disproportionation reaction with alkalies
(A) Iodine
(B) Fluorine
(C) Bromine
(D) Chlorine
Ans: B
Fluorine
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