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36. When a student put some copper turnings in a colourless solution, he observed that the solution gradually turned blue. The colourless solution is most likely to be (NTSE Chandigarh, Stage-I, 2016-17)
Ferrous sulphate solution
Magnesium nitrate solution
Silver nitrate solution
Copper sulphate solution
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37. Which is the symbol of the element tungsten? (NTSE Delhi, Stage-I, 2014-15)
Ta
Tc
W
V
38. Match the terms used in metallurgy with their meanings A. Roasting i. Heating the ore just below its melting pOint in the absence of air B. Calcination ii. Unwanted impurities present in the ore C. Gangue iii. Heating the ore just below its melting point in the presence of air D. Flux iv. Process of increasing the percentage of desired component of the ore v. Substance added to ores to remove unwanted impurities (NTSE Karnataka, Stage-I, 2014-15)
A-i B-iii C-ii D-v
A-iii B-i C-iv D-ii
A-iii B-i C-ii D-v
A-i B-iii C-v D-ii
39. The metal that can be obtained by electrolysis of an aqueous solution of its salts is (NTSE Bihar, Stage-I, 2014-15)
Zn
Cr
Mg
Ca
40. By which reaction metals are obtained from metal oxide (NTSE Uttar Pradesh, Stage-I, 2015-16)
Liquefaction
Reduction
Calcination
Roasting
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