Which gas is mostly present in Venus atmosphere?
(A) Hydrogen
(B) Carbon Dioxide
(C) Helium
(D) Nitrogen
German silver used for making utensils is an alloy of
(A) copper silver nickel
(B) copper zinc nickel
(C) copper zinc aluminum
(D) copper nickel aluminum
Which is the purest form of iron?
(A) Steel
(B) Cast iron
(C) Pig iron
(D) Wrought iron
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