Ans . D
Q.2 Which of the following is in liquid form at room temperature?
Q.3 Sodium metal is kept under
Q.4 Which of the following are the ingredients of gunmetal?
(A) Iron, Zinc, Titanium
(B) Iron, tin
(C) Iron, Brass, Tin
(D) Copper, Tin
Q.5 From which mineral is radium obtained?
Q.6 Potassium nitrate is used in
Q.7 Permanent hardness of water may be removed by the addition of
(A) sodium carbonate
(C) potassium permanganate
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