21. Structure of H ,C , N and their oxidation state in HCN are

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The heats of neutralisation of $C H_{3} C O O H$ , HCOOH, HCN and $H_{2} S$ are -12.8, -13.2, -3.2 and -3.9 kcal per equivalent. Arrange these acids in increasing order of strength.

Q. In the reaction of

H_{2} S O_{4}

with

H_{2} S

, the change in oxidation states of sulphur are:

The oxidation state of the $C$ atom in $H C N$ molecule is

Enthalpy of hydrogenation is the enthalpy change when one mole of unsaturated compound is converted to saturated compound. $Δ_{H} h y d r o g e n a t i o n$ helps to calculate resonance energy.

The heat of neutralization of $C H_{3} C O O H, H C O O H, H C N$ and $H_{2} S$ are -12.8, -13.2, -3.2 and -3.9 Kcal per equivalent. Arrange these acids in increasing order of strength.

Q. Assertion :Oxidation number of carbon in HCN is

+ 2

. Reason: Carbon always shows an oxidation state of

+ 4

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