Short Answer TypeWhat is charcoal? Give its different forms.
Charcoal is black, soft and highly porous substance which exists in the following forms:
(i) Wood charcoal: It is obtained by heating wood or nutshells strongly in a limited supply of air and volatile gases are allowed to escape. It is mainly elemental carbon (95 to 98%). It is used in the gas masks to remove poisonous gases.
(ii) Animal charcoal: It is also called bone charcoal and obtained by destructive distillation of bones. It contains 10 to 12% by carbon and rest is calcium phosphate. Animal charcoal is generally used to absorb colouring matter from sugarcane juice and also to decolourise certain impure compounds.
(iii) Sugar charcoal: It is formed by the action of concentrated H2SO4 on sucrose (C12H22O11).
Sugar charcoal is a very good adsorbent to remove colouring matter.
Long Answer TypeShort Answer TypeDescribe what happens (give chemical equations only) when:
(i) carbon monoxide is treated with chlorine.
(ii) carbon monoxide is passed through heated NaOH under pressure.
(iii) Vapours of carbon monoxide are passed over nickel and
(iv) carbon monoxide is passed through heated ferric oxide.
Long Answer TypeShort Answer TypeWhat is the action of heat on:
(i) Sodium bicarbonate
(ii) calcium carbonate
(iii) Zinc carbonate?
Give one method for industrial preparation and one for laboratory preparation of CO and CO2 each.
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