The first and the second ionisation enthalpies in kJ mol-1 and the electron gain enthalpy in kJ mol-1 of a few elements are given below- Elements -iH1 -iH2 -egH- A 520 7300 -60- B 419 3051 -48- C 1681 3374 -328- D 1008 1846 -295- E 2372 5251 -48- F 738 1451 -40- -Which one of the above elements is least reactive-

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Standard XII

Chemistry

Ionization Enthalpy

The first and...

Question

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?

C

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D

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E

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F

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Solution

The correct option is C $E$
Among all the given elements, the element $(E)$ having very high ionisation enthalpy and positive electron gain enthalpy would be a noble element, i.e., least reactive.

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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 :

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

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:

Elements	Δ_iH	Δ_iH	Δ_egH
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.

(d) the least reactive non-metal.

(e) the metal which can form a stable binary halide of the formula MX₂, (X=halogen).

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

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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The correct option is C EAmong all the given elements, the element (E) having very high ionisation enthalpy and positive electron gain enthalpy would be a noble element, i.e., least reactive.

The correct option is C $E$
Among all the given elements, the element $(E)$ having very high ionisation enthalpy and positive electron gain enthalpy would be a noble element, i.e., least reactive.