(a) Ammonium chloride and zinc chloride
(b) Sodium chloride and calcium chloride
(c) Magnesium chloride and zinc chloride
(d) Ammonium chloride and calcium chloride
Ans: (a)
61. The iron container (vessel) is galvanized by: [Jharkhand PCS (Pre) 2008]
(a) Chromium
(b) Zinc
(c) Aluminium
(d) Nickel
Ans: (b)
62. Silver ware turns black after a period of time due to formation of [NDA 2011]
(a) nitrate coating on silver
(b) sulphide coating on silver
(c) chloride coating on silver
(d) oxide coating on silver
Ans: (b)
63. Which one among the following methods is not effective in removing arsenic from contaminated ground water?
[NDA, 2011]
(a) Boiling
(b) Coagulation adsorption
(c) Ion exchange
(d) Reverse osmosis
Ans: (b)
64. Cryolite is an ore of which one of the following metal? [CDS 2008]
(a) Antimony
(b) Barium
(c) Arsenic
(d) Aluminium
Ans: (d)
65. Usually doctors recommend the foodstuffs which are prepared in the oil with comparison to the vegetable ghee
because; [Uttrakhand PCS (Pre) 2008]
(a) oil has unsaturated fats
(b) oil has saturated fats
(c) to store the oil is convenient
(d) oil is cheeper
Ans: (a)
66. Which one of the following pairs of gases mainly cause the explosion in the land mines? [IAS (Pre) 2008]
(a) H2 and 02
(b) Oxygen and acetylene
(c) Methane and air
(d) Carbondioxide and methane
Ans: (c)
67. The catalyst used in the hydrogenation process of the oils is :
(a) Fe
(b) Ni
(c) Mo
(d) Pt
Ans: (b)
68. Which of the following is another name of RDX: [IAS (Pre) 2007]
(a) Cynohydrine
(b) Deestron
(c) Cychlohexane
(d) Cychlonite
Ans: (d)
69. The catalyst used in the production of H2SO4 by the Contact process is/ are:
(a) pieces (powder) of iron
(b) pieces (powder) of platinum
(c) oxide of nitrogen
(d) nickel
Ans: (b)
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