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Applications of Colloids

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Question

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

A

sodium aluminium silicate is used in the softening of hard water

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B

potash alum is used in shaving rounds and as a styptic in medicine

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C

artificial rain is caused by throwing electrified sand on the clouds from an aeroplane

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D

deltas are formed at a place when the river pours its water into the sea

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Solution

The correct option is B sodium aluminium silicate is used in the softening of hard water
The statement which is not relevant in the discussion of colloids is sodium aluminium silicate is used in the softening of hard water. Sodium aluminium silicate and the softening of hard water have nothing to do with colloids. It is actually the simple chemical substitution of calcium salts with zeolite so that calcium zeolite precipitates out, and hardness of water removes.

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The clouds consists of charged particles of water dispersed in air. Some of them are positively charged, others are negatively charged. When positively charged clouds come closer, they cause lightening and thundering whereas when positive and negative charged colloids come closer, they cause heavy rain by aggregation of minute particles. It is possible to cause artificial rain by throwing electrified sand or silver iodide from an aeroplane and thus, coagulation the mist hanging in air.

Clouds are colloidol solution of :

The clouds consists of charged particles of water dispersed in air. Some of them are positively charged, others are negatively charged. When positively charged clouds come closer, they cause lightening and thundering whereas when positive and negative charged colloids come closer, they cause heavy rain by aggregation of minute particles. It is possible to cause artificial rain by throwing electrified sand or silver iodide from an aeroplane and thus, coagulation the mist hanging in air.

AgI helps in artificial rain because :

The clouds consist of charged particles of water dispersed in the air. Some of them are positively charged, others are negatively charged. When positively charged clouds come closer, they cause lightning and thundering whereas when positive and negative charged colloids come closer, they cause heavy rain by aggregation of minute particles. It is possible to cause artificial rain by throwing electrified sand or silver iodide from an aeroplane and thus, coagulation the mist hanging in the air.

Electrical chimneys are made on the principle of :

Q. Softening of hard water is done using sodium aluminium silicate (zeolite). This causes:

Q. Assertion :Zeolite, which is hydrated sodium aluminium silicate is used as a water softner. Reason: The sodium ions of zeolite are exchanged with calcium and magnesium ions when hard water is passed through it.

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