(d) it cannot donate or accept electrons
Ans: (c)
156. The conversion of Fe++ to Fe+++ is: [NDA2004]
     (a) oxidation
     (b) reduction
     (c) ionisation
     (d) nuclear reaction
Ans: (a)
157. Which of the following quantum numbers is/are required to describe the state of an electron?
         1) Principal
         2) Azimuthal
         3) Magnetic
         4) Spin
     (a) 1 only
     (b) 1 and 2
     (c) 1, 2 and 3
     (d) 1, 2, 3 and 4
Ans: (d)
158. The fractionation of petroleum gives many products. What is the correct order in which the various fractions mentioned
     below separate from petroleum?
         1) Gasoline
         2) Kerosene
         3) Diesel oil
         4) Lubricating oil
     (a) 1, 2, 3, 4
     (b) 2, 3, 4, 1
     (c) 3, 2, 1, 4
     (d) 4, 2, 3, 1
Ans: (a)
159. Water is a good fire extinguisher because:
         1) the specific heat of water is high.
         2) steam, formed as the water boils in contact with the burning object, forms an envelop and shuts off oxygen
               supply.
     (a) 1 only
     (b) 2 only
     (c) Both 1 and 2
     (d) Neither 1 nor 2
Ans: (c)
160. Sulphuric acid is used in the" manufacture of:
         1) Fertilisers
         2) Dyestuff intermediates
         3) Pigments and paints
         4) Storage batteries
     (a) 1 and 2
     (b) 2 and 3
     (c) 1, 2, 3 and 4
     (d) 1, 3 and 4
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