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Reaction Conditions

Give reason.A...

Question

Give reason.
Apparatus for laboratory preparation of hydrogen should be air-tight and away from a naked flame.

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Solution

Apparatus for laboratory preparation of hydrogen should be air-tight and away from a naked flame because the mixture of hydrogen and air explodes violently when brought near a flame.

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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.

For the laboratory preparation of hydrogen, give a method of collection.

Q. Give reasons for the following:
In the laboratory preparation of nitric acid, the mixture of concentrated sulphuric acid and sodium nitrate should not be heated very strongly, above 200°C.

Q. Give reasons:
Apparatus for laboratory preparation of hydrogen should be air tight and away from a naked flame.

Q. Explain why apparatus for laboratory preparation of hydrogen should be air tight and away from a naked flame?

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