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Electron Gain Enthalpy

Explain the a...

Question

Explain the appropriate reason for the following statement:
(a)Size of $M g^{2 +}$ is less than Mg.
(b) Electron gain enthalpy of Cl is more than that of F.

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Solution

Chlorine has higher electron gain enthalpy than fluorine because due to small size of fluorine some energy is utilized in overcoming the force of repulsion among electrons. Hence it has lesser value of electron affinity.

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Q. Give reasons for the following:

(a) Oxygen has lower ionisation energy than that of nitrogen.

(b) Electron gain enthalpy of chlorine is more negative than that of fluorine.

O^{2 -}

A l^{3 +}

N a^{+}, F^{-}

M g^{2 +}

in the increasing order of their sizes.

Q. Statement 1:

F

atom has a less negative electron gain enthalpy than

C l

atom.
Statement 2: Additional electron is repelled more efficiently by

3 p

C l

2 p

F

Q. Assertion :For the element

O

F

, the electron gain enthalpy is less negative than that of the succeeding element. Reason: Electron gain enthalpy becomes less negative as we go down a group.

Q. Assertion :Assertion:

N_{2}

is less reactive than

P_{4}

Reason: Reason: Nitrogen has more electron gain enthalpy than phosphorus.

Q. Give reasons for the following:
(a) Red phosphorus is less reactive than white phosphorus.
(b) Electron gain enthalpies of halogens are largely negative.
(c)

N_{2} O_{5}

is more acidic than

N_{2} O_{3}

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