323. Hydrogenation of oil takes place in a/an __________ reactor.
324. An alkali metal salt of palmitic acid is known as
325. Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it
326. Very fine suspended and colloidal impurities are removed from water by a process called
327. Chrome tanning and vegetable tanning are done for
328. Plasticisers are added to paints to
329. Magnesium and calcium __________ cause temporary hardness of water.
