The first -iH1 and second -iH2 ionisation enthalpies in kJ mol -1 and the -eqH electron gain enthalpy in kJ mol -1 of a few elements are given below -Elements -iH1 -i H2 -egHAP5207300-60BQ4193051-48CR16813374-328DS10081846-295ET23725251-48FU7381451-40The least reactive element is -

The correct option is D TFrom the given data, it is visible that ( _i H_1 ) and #160;( _i H_2 ) for T is maximum which means it is very difficu ...

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Byju's Answer

Standard XII

Chemistry

Trend in Ionisation Enthalpy

The first Δ...

Question

The first $Δ_{i} H_{1}$ and second $Δ_{i} H_{2}$ ionisation enthalpies in kJ mol $^{- 1}$ and the $Δ_{e q} H$ electron gain enthalpy in kJ mol $^{- 1}$ of a few elements are given below :

Elements $Δ_{i} H_{1}$ $Δ_{i} H_{2}$ $Δ_{e g} H$
(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 least reactive element is :

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Solution

The correct option is D T
From the given data, it is visible that ( $△_{i} H_{1}$ ) and ( $△_{i} H_{2}$ ) for $T$ is maximum which means it is very difficult to take out an electron from $T$ .

Also ( $△_{e g} H$ ) for $T$ is positive which resembles the value of a noble gas which is inert and least reactive.

Therefore, the correct option is D.

Suggest Corrections

Similar questions

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 :

Q. The first

(Δ_{i} H_{1})

and the second

(Δ_{i} H_{2})

ionization enthalpies (in kJ mol

^{- 1}

) and the

(Δ_{e g} H)

electron gain enthalpy (in kJ mol

^{- 1}

) of a few elements are given below:

Elements	$Δ H_{1}$	$Δ H_{2}$	$Δ_{e g}$ H
I	520	7300	-60
II	419	3051	-48
III	1681	3374	-328
IV	1008	1846	-295
V	2372	5251	+48
VI	738	1451	-40

Which of the above elements is likely to be :
(a) the least reactive element,
(b) the most reactive metal,
(c) the most reactive non-metal,
(d) the least reactive non-metal,
(e) the metal which can form a stable binary halide of the formula MX

_{2}

(X=halogen) and
(f) the metal which can form a predominantly stable covalent halide of the formula MX (X=halogen)?

Q. The first and the second ionisation enthalpies in

k J m o l^{- 1}

and the electron gain enthalpy in

k J m o l^{- 1}

of a few elements are given below:

\begin{matrix} Elements & Δ_{i} H_{1} & Δ_{i} H_{2} & Δ_{e g} H (A) & 520 & 7300 & - 60 (B) & 419 & 3051 & - 48 (C) & 1681 & 3374 & - 328 (D) & 1008 & 1846 & - 295 (E) & 2372 & 5251 & + 48 (F) & 738 & 1451 & - 40 \end{matrix}

Which one of the above elements is least reactive?

Q. The first (

Δ H_{1}

) and second (

Δ H_{2}

) ionisation enthalpies (in

k J m o l^{- 1}

) and the electron gain enthalpy (

Δ_{e g} H

) (in

k J m o l^{- 1}

) of the elements I, II, III, IV and V are given below:

Element	$Δ_{1} H_{1}$	$Δ_{1} H_{2}$	$Δ_{e g} H$
I	520	7300	-60
II	419	3051	-48
II	1681	3374	-328
IV	1008	1846	-295
V	2372	5251	+48

The most reactive metal and the least reactive non-metal of these are respectively.

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 :

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	Elements	$Δ_{i} H_{1}$	$Δ_{i} H_{2}$	$Δ_{e g} H$
(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 first ΔiH1 and second ΔiH2 ionisation enthalpies in kJ mol−1 and the ΔeqH electron gain enthalpy in kJ mol−1 of a few elements are given below :ElementsΔiH1ΔiH2ΔegH(A)P5207300-60(B)Q4193051-48(C)R16813374-328(D)S10081846-295(E)T23725251+48(F)U7381451-40The least reactive element is :