Mechanism of action of sodium nitroprusside in cyanide poisoning -

Ans. is 'a' i.e., Produces methemoglobinemia o Nitrates generate methaemoglobin which has high affinity for cyanide and forms cyanomethaemoglobin.o Cynomethaemoglobin may again dissociate to release cyanide, therefore, sodium thiosulfate is given to form sod.