Match the corect ionisation enthalpies and electron gain enthalpies of the following elements-i- Most reactive non metal- A - 419 - 3051 - -48Wii- Most reactive metal - B - 1681 - 3374 - -32811iii - Least reactive element - C - 738 - 1451 - -40-iv - Metal forming binary halide - D- - 2372 - 5251 - -48 Whline

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Trend in Electron Affinity

Match the cor...

Question

Match the corect ionisation enthalpies and electron gain enthalpies of the following elements.
$\begin{matrix} E l e m e n t s & △ H_{1} & △ H_{2} & △_{e g} H (i) & M o s t r e a c t i v e n o n m e t a l & A & 419 & 3051 & - 48 (i i) & M o s t r e a c t i v e m e t a l & B & 1681 & 3374 & - 328 (i i i) & L e a s t r e a c t i v e e l e m e n t & C & 738 & 1451 & - 40 (i v) & M e t a l f o r m i n g b i n a r y h a l i d e & D . & 2372 & 5251 & + 48 \end{matrix}$

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Solution

$△_{I} H_{1} i s f i r s t i o n i s a t i o n e n t h a l p y a n d h i g h △_{I} H_{2} i s s e c o n d i o n i s a t i o n e n t h a l p y a n d △_{e g} H i s e l e c t r o n g a i n e n t h a l p y$

(i) Most reactive non-metal has high $△_{I} H_{1}$ and high $△_{I} H_{2}$ and most negative $△_{e g}$ H. Therefore , the element is B.
(ii) Most reactive metal has low $△_{I} H_{1}$ and higher $△_{I} H_{2}$ (because the second electron has to be lost from the noble gas configuration) and has small negative $△_{e g}$ H. Therefore, the element is A
(iii) Noble gases are the least reactive elements. They have very higher $△_{I} H_{1} a n d △_{I} H_{2}$ and have positive $△_{e g}$ H values. Thus the element is D.
(iv) metal forming binary halides are halides are alkaline earth metals. They have $△_{I} H_{1} a n d △_{I} H_{2}$ values little higher than those of most reactive metals (such as A) and have comparatively slightly less negative $△_{e g}$ H values. Thus the element is C.

Answer:

$\begin{matrix} E l e m e n t s & △ H_{1} & △ H_{2} & △_{e g} H (i) & M o s t r e a c t i v e n o n m e t a l & B & 1681 & 3374 & - 328 (i i) & M o s t r e a c t i v e m e t a l & A & 419 & 3051 & - 48 (i i i) & L e a s t r e a c t i v e e l e m e n t & D . & 2372 & 5251 & + 48 (i v) & M e t a l f o r m i n g b i n a r y h a l i d e & C & 738 & 1451 & - 40 \end{matrix}$

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Similar questions

Match the correct ionization enthalpies and electron gain enthalpies of the following elements.

List I	List II
A. Most reactive non-metal	1. $Δ H_{1} = 419, Δ H_{2} = 3051, Δ_{e g} H = - 48$
B. Most reactive metal	2. $Δ H_{1} = 1681, Δ H_{2} = 3374, Δ_{e g} H = - 328$
C. Least reactive elements	3. $Δ H_{1} = 738, Δ H_{2} = 1451, Δ_{e g} H = - 40$
D. Metal forming binary halide	4. $Δ H_{1} = 3272, Δ H_{2} = 5251, Δ_{e g} H = + 48$

Q. The first (

Δ H_{1}

) and second (

Δ H_{2}

) ionisation enthalpies (in kJ

m o l^{- 1}

) and the (

Δ_{e g} H

) electron gain enthalpy (in kJ

m o l^{- 1}

) of a few elements are given below:
Elements

Δ_{1} H_{1}

Δ_{1} H_{2}

Δ_{e g} H

(A) P 520 7300 -60
(B) Q 419 3051 -48
(C) R 1681 3374 -328
(D) S 1008 1846 -295
(E) T 2372 5251 +48
(F) U 738 1451 -40
The most reactive metal is :

The first (Δ_iH1) and the second (Δ_iH) ionization enthalpies (in kJ mol^–1) and the (Δ_egH) electron gain enthalpy (in kJ mol^–1) of a few elements are given below: