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  • Which of the following order is correct ?Option: 1  F > N > C > Si > Ga – non-metallic character.<div class='qna

Which of the following order is correct ?

Option: 1

 F > N > C > Si > Ga – non-metallic character.


Option: 2

 F > O > Cl > N – oxidising property.


Option: 3

C > N > P > Si – electron affinity value.


Option: 4

Only (1) and (2)


Answers (1)

Non- Metal -

–  Located at the right of Periodic Table

–  Poor conductor of heat & electricity 

–  They are usually solids or gases at room temperatures.

-

Difference between electron gain enthalpy and electron affinity -

Electron affinity is defined at absolute zero and therefore at any other temperature heat capacities of the reactants & product have to be taken into account.

- wherein

\Delta _{eg} H^{\circleddash }= -EA-\frac{5}{2}RT

-

(A) As electronegativity increases the non-metallic character increases as tendency to form anion increases.

(B) The oxidizing character of elements increases from left to right across a period, in group its decreases because of presence of vacant d orbitals in their valency shells Thus, we get the decreasing order of oxidizing property as F > O > N.

Again, the oxidizing character of elements decreases down a group. Thus, we get F > Cl.

However, the oxidizing character of O is more than that of Cl i.e., O > Cl.

Hence, the correct order of chemical reactivity of F, Cl, O, and N in terms of their oxidizing property is F > O > Cl > N.

(C) C = – 121; Si = – 135 ; P = – 60 ; N = + 31 (all values are in KJ/mole). It depends on various factors like size of atom, nuclear charge, partially filled, half filled and completely filled electronic configurations.

Therefore, Option(4) is correct.

Posted by

Ramraj Saini

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