Following are the applications of adsorption. Select the correct ones.
I. For producing high vacuum
II. In gas masks
II. Separation of inert gases
V. In froth floatation process
V. In adsorption indicators
VI. In curing diseases

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All of these

All except V

All except IV and V

All except I and IV

answer is A.

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Detailed Solution

(I) Traces of moisture and air can prevent formation of vacuum. Traces of moisture and air can be adsorbed by charcoal.

(II) Gas mask (a device which consists of activated charcoal or mixture of adsorbents) is usually used for breathing in coal mines to adsorb poisonous gases.

(III) Due to the difference in degree of adsorption of gases by charcoal, a mixture of noble gases can be separated by adsorption on coconut charcoal at different temperature.

(IV) A low grade sulphide ore is concentrated by separating it from silica and other earthy matter by this method based on adsorption.

(V) Surfaces of some precipitates AgCUAgBr etc.. have the property of adsorbing some dyes Iike eosin, fluorescein etc.
Thus, there is formation of charactenstic colours at the end point.
(VI) A number of drugs are used to Kill germs by getting adsorbed on them.

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