UPSC Chemistry-Acids, Bases, Salts and Metals

Electrolytic cell ✘ Storage cell ✘ Primary cell ✘ Fuel cell ✔

becomes < 6 ✘ remains the same i.e., 6 ✘ becomes > 6 ✘ becomes neutral, i.e., 7 ✔

K4[Fe(CN)6] ✘ K2SO4.Al2(SO4)3.24H2O ✘ CuSO4.5H2O ✘ NaCl ✔

carbon dioxide from air is dissolved in the water ✘ oxygen from air is dissolved in the water ✘ the dissolved carbon dioxide of the ground water escapes into air ✘ the dissolved oxygen of the ground water escapes into air ✔

carbon dioxide ✘ bicarbonate salts ✘ Both [a] and [b] ✘ carbon dioxide and lime ✔

sodium hydrogen phthalate ✘ magnesium hydroxide ✘ calcium hydroxide ✘ manganese acetate ✔

It is used in soda acid fire extinguisher ✘ It is added for faster cooking. ✘ It is a corrosive base ✘ It neutralizes excess acid in the stomach ✔

acetic acid ✘ nitric acid ✘ hydrochloric acid ✘ sulphuric acid ✔

crushing and grinding ✘ concentration of ore ✘ calcination ✘ roasting ✔

aluminium is a light metal ✘ aluminium has more affinity for oxygen ✘ aluminium is a strong oxidising agent ✘ aluminium is a reactive metal ✔