Question

a) Which hydrocarbons burn with (i) non-sooty blue flame and (ii) sooty yellow flame?

(b) What happens when methane reacts with chlorine?

(c) What is rectified spirit?

(d) Why does soap not work in hard water?

(e) What is glacial acetic acid?

Answer 1

b. when methane reacts with chlorine and exposed to sunlight ,it forms an organic compound chloromethane.

Answer 2

Explanation:

a) Saturated hydrocarbons burns with non sooty flame and unsaturated hydrocarbon burns with sooty flame.

b) When methane reacts with chlorine , it gives chloro methane.

$CH_4+Cl_2\rightarrow CH_3Cl+HCl$

c)rectified spirit: The direct distillation of the fermented molasses gives 90% of alcohol.

d) This is because calcium and magnesium ions present in the hard water replaces the ionic part of the soap molecule which results in formation of white precipitation termed as scum.

e) The purest form of acetic acid is known as glacial acetic acid. The glacial acetic acid has very less amount of water due to which it get crystallize into solid crystals for which it is called as glacial acetic acid.