Question

Match the correct ionisation enthalpies and electron gain enthalpies of the following elements

	Elements		$\Delta H_1$	$\Delta H_2$	${\Delta }_{eg}H$
(i)	Most reactive non-metal	A.	419	3051	-48
(ii)	Most reactive metal	B.	1681	3374	-328
(iii)	Least reactive element	C.	738	1451	-40
(iv)	Metal forming binary halide	D.	2372	5251	+48

• A. (i)-A, (ii)-B, (iii)-D, (iv)-C
• B. (i)-B, (ii)-A, (iii)-D, (iv)-C
• C. (i)-C, (ii)-B, (iii)-A, (iv)-D
• D. (i)-D, (ii)-C, (iii)-A, (iv)-B

Answer 1

Answer: (B)

Elements Most reactive non-metal - $B$ (Most negative ${\Delta }_{eg}H$
(ii) Most reactive metal - $A$ (Low$\Delta H_1$ and high $\Delta H_2$)
(iii) Least reactive element - $D$ (Very high $\Delta H_1$ and +ve ${\Delta }_{eg}H$)
(iv) Metal forming binary halide - $C$ (Low $\Delta H_1$ and $\Delta H_2$)