The first - H 1 and second - H 2 ionisation enthalpies in kJ mol -1 and the - eg H electron gain enthalpy in kJ mol -1 of a few elements are given below-eg H-1 H 2 Elements -1 H 1A P 5204197300 -60-60-48-328-295D S 7300305133741846- B Q 419-2 - C R 1681 3374 - - S 1008 1846 -295- 2372 5251 -48- 738 1451 -40 -E TF U - 2 1- 2 5- 1- 1 -The most reactive metal is-A- P B- QC- UD- S

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Chemistry

Ionization Enthalpy

The first .Δ ...

Question

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 :

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B Q
Metal having low $I E_{1}$ and higher $I E_{2}$ corresponds to alkali metal. Hence, Q is most reactive metal (easily forms cation).

Suggest Corrections

Similar questions

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.

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_{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 :

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)?

Join BYJU'S Learning Program

Explore more

Ionization Enthalpy

Standard XII Chemistry

Join BYJU'S Learning Program

The correct option is B QMetal having low IE1 and higher IE2 corresponds to alkali metal. Hence, Q is most reactive metal (easily forms cation).

The correct option is B Q
Metal having low $I E_{1}$ and higher $I E_{2}$ corresponds to alkali metal. Hence, Q is most reactive metal (easily forms cation).