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Preparation of Hydrogen

Hydrogen is c...

Question

Hydrogen is collected by downward displacement of water and not of air, even though it is lighter than air. Explain why?

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Solution

Hydrogen gas is almost insoluble in water,it can be collected by displacement of water using an inverted apparatus. Hydrogen is highly explosive when mixed with air.

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Q. Why Hydrogen although lighter than air, is not collected by the downwards displacement of air?

Q. Give reasons for the following:
Though hydrogen is lighter than air, it cannot be collected by downward displacement of air.

Give reasons :

(a) Hydrogen is collected by the downward displacement of water and not of air, even though it is lighter than air.

(b) A candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar.

(c) Oxy-hydrogen flame is used for welding and cutting metals.

(d) Apparatus for laboratory preparation of hydrogen should be air tight and away from a naked flame.

Q. Assertion :The downward displacement of air method used for drying and collecting ammonia gas. Reason: Ammonia gas is lighter than air and hence collected by the downward displacement of air. Ammonia is not collected over water since it is highly soluble in water.(1 vol.of water dissolves about 702 vol.at 20C and 1 atm pressure). The drying agent used is calcium oxide.

Q. Assertion :Oxygen is collected by the downward displacement of water and not over air. Reason: Downward displacement of water is used to collect oxygen. Any gas be collected by this method and the gas pushes the water down as it is lighter and do not react with water.

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