Chemistry - 18
86. The most malleable metal is
(A) Iron
(B) Gold
(C) Platinum
(D) Silver
(A) Iron
(B) Gold
(C) Platinum
(D) Silver
Correct Answer: [B] Gold.
87. The white vitriol is
(A) MgSO4 , 7H2O
(B) CuSO4 , 5H2O
(C) FeSO4 , 7H2O
(D) ZnSO4 , 7H2O
(A) MgSO4 , 7H2O
(B) CuSO4 , 5H2O
(C) FeSO4 , 7H2O
(D) ZnSO4 , 7H2O
Correct Answer: [D] ZnSO4 , 7H2O.
88. Rate of radiation of heat from a body is the highest if its surface is
(A) Smooth but black
(B) Rough but black
(C) White
(D) Smooth
(A) Smooth but black
(B) Rough but black
(C) White
(D) Smooth
Correct Answer: [A] Smooth but black.
89. Galvanization is deposition of
(A) tin on iron
(B) copper on iron
(C) zinc on iron
(D) aluminum on iron
(A) tin on iron
(B) copper on iron
(C) zinc on iron
(D) aluminum on iron
Correct Answer: [C] zinc on iron.
90. How many grams of NaOH are needed to make 100 ml. of a 0.5 M solution of NaOH (Atomic weight : Na = 23, O=16, H=1)
(A) 4
(B) 1
(C) 2
(D) 20
(A) 4
(B) 1
(C) 2
(D) 20
Correct Answer: [C] 2.
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