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41. Extraction of highly electropositive metal is done by (NTSE West Bengal, Stage-I, 2015-16)
Electrolysis of aqueous solution of metal chloride
Electrolysis of molten metal chloride
Carbon reduction of the oxide of the metal
Strongly heating the oxide of the metal
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42. An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be(NTSE Rajasthan, Stage-I, 2015-16)
Calcium
Carbon
Silicon
Iron
43. Which method is used for concentration of those ores obtained in the sulphide form? (NTSE Gujarat, Stage-I, 2015-16)
Magnetic separation
Centrifugation
Froth flotation
Calcinations
44. During Electrolytic refining of copper (a) Pure copper acts as anode (b) Pure copper acts as cathode (c) Impure copper acts as anode (d) Impure copper acts as cathode (NTSE Maharashtra, Stage-I, 2014-15) (NTSE Maharashtra, Stage-I, 2015-16)
(a), (b)
(b), (c)
(a), (d)
(b), (d)
45. Read the following statements and choose the correct option (a)Calcium is present in the bones of animals and human beings as sulphate (b) Heating calcium carbonate to 1070K-1270K gives quick lime (c) Aluminium is not affected by dry air (NTSE Haryana, Stage-I, 2015-16)
Only (a) and (c) are true
Only (a) and (b) are true
Only (b) and (c) are true
All are true
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