Chemistry - Study Mode

[#726] Water gas is the combination of
Correct Answer

(A) CO and H 2

Explanation

Solution: Water-gas A mixture of carbon monoxide (CO) and hydrogen (H2) produced by passing steam over red-hot coke using the endothermic reaction.

[#727] The gas that causes suffocation and death when coal or coke is burnt in a closed room is
Correct Answer

(C) Carbon monoxide

Explanation

Solution: Exhaust fumes of motor cars, gases produced from coal fire in a closed room and coal gas, all contain carbon monoxide, which is the cause of their poisonous nature. When carbon monoxide is inhaled, it prevents the oxygen from combining with hemoglobin and instead combines itself with hemoglobin to form carboxyhaemoglobin, which is stable compound. This causes oxygen starvation in the body tissues and eventually causes death by suffocation.

[#728] Which one is not a pure form of carbon?
Correct Answer

(D) Gold

Explanation

Solution: There are many pure forms of carbon in earth, but Diamond is the purest form of carbon. Other pure forms are graphite, fullerene and charcoal. Gold is not a form of carbon.

[#729] Which one is the purest form of carbon?
Correct Answer

(C) Diamond

Explanation

Solution: There are many pure forms of carbon in earth, but Diamond is the purest form of carbon. Other pure forms are graphite, fullerene and charcoal.

[#730] A subshell with l = 2 can take up
Correct Answer

(D) 10 electron

Explanation

Solution: l = 2 corresponds to d orbitals which can take upto 10 electrons.