JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Pick out the statement which is not relevant in the discussion of colloids.

(A)Sodium aluminium silicate is used in the softening of hard waterCorrect
(B)Potash alum is used in shaving rounds and as a styptic in medicine
(C)Artificial rain is caused by throwing electrified sand on clouds from an aeroplane
(D)Deltas are formed at the place where a river pours its water into the sea

Answer: (A)

Solution

Alum acting as a styptic coagulates negatively charged blood-protein colloids (B), artificial rain is induced by neutralising/coagulating the charged water-droplet aerosol in clouds using electrified particles (C), and deltas form when colloidal clay particles carried by river water are coagulated on meeting the

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Question ID VK-144778