Q.41 Which of the following was to be discovered first in the chromospheres of the sun?
(A) Krypton
(B) Xenon
(C) Neon
(D) Helium
Q.42 Which of the following is in liquid form at room temperature?
(A) Lithium
(B) Sodium
(C) Francium
(D) Cerium
Q.43 Sodium metal is kept under
(A) petrol
(B) alcohol
(C) water
(D) kerosene
Q.44 Which of the following are the ingredients gunmetal?
(A) Iron, Zinc, Titanium
(B) Iron, tin
(C) Iron, Brass, Tin
(D) Copper, Tin
Q.45 From which mineral is radium obtained?
(A) Rutile
(B) Haematite
(C) Limestone
(D) Pitchblende
Q.46 Potassium nitrate is used in
(A) medicine
(B) fertilizer
(C) salt
(D) glass
Q.47 Permanent hardness of water may be removed by the addition of
(A) sodium carbonate
(B) alum
(C) potassium permanganate
(D) lime
Q.48 Soda water contains
(A) carbonic acid
(B) sulphuric acid
(C) carbon dioxide
(D) nitrous acid
Q.49 The most important ore of aluminum is
(A) galena
(B) calamine
(C) calcite
(D) bauxite
Q.50 Most soluble in water is
(A) camphor
(B) sulfur
(C) common salt
(D) sugar
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