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26. The technique through which gold and silver are refined (NTSE Karnataka, Stage-I, 2015-16)
Electrolytic refining
Vacuum melting
Liquation process
Zone refining
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27. Brass contains (NTSE Madhya Pradesh, Stage-I, 2015-16)
Cu and Sn
Cu and Ni
Cu and Zn
Mg and AI
28. Froath floatation process for the concentration of ores is an example of the practical application of (NTSE Chhattisgarh, Stage-I, 2015-16)
Coagulation
Absorption
Adsorption
Sedimentation
29. The impurity present in the ore is called (NTSE Telangana, Stage-I, 2016-17)
Gangue
Flux
Slag
Mineral
30. Which of the following gas is known as tear gas? (NTSE Uttar Pradesh, Stage-I, 2016-17)
Methyl isocyanide
Sulphur dioxide
Chloropicrin
Nitrous oxide
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