Assertion (A): Carbon dioxide is a compound
Reason (R) : Carbon and Oxygen combine together in the ratio 3:8 by mass.

Assertion (A): Carbon dioxide turns lime water milky. Reason (R ): Carbon dioxide sullies the water.

Assertion (A) : Carbon monoxide is a posonous gas . Reason (R) : Caron monoxide combines with haemoglobin of blood to form carboxy-haemoglonbin whith is not capable of asorbing oxygen .

Assertion : Carbon monoxide is a poisonous gas Reason : Carbon monoxide combines with hameoglobin to form carboxy-haemoglobin which prevents absorption of oxygen by it.

Carbon dioxide is a mixture of carbon and oxygen.

Assertion (A) : Carbon forms a large number of compounds . Reason (R) : Carbon has small size and is tetravalent .

Assertion (A) : Carbon forms a large number of compounds . Reason (R) :Carbon has smallised and is tertavelent. Reason (R) : Carbon ha small size and is teravalent .

Assertion (A) : The pH of acid rain is less than 5.6. Reason (R) : Carbon dioxide present in the atmosphere dissolves in rain water and forms carbonic acid.