S Block Elements Question 8

Question 8 - 29 January - Shift 1

The correct order of hydration enthalpies is

(A) $K^{+}$

(B) $Rb^{+}$

(C) $Mg^{2+}$

(D) $Cs^{+}$

(E) $Ca^{2+}$

Choose the correct answer from the options given below:

(1) C $>$ A $>$ E $>$ B $>$ D

(2) $E>C>A>B>D$

(3) C $>$ E $>$ A $>$ D $>$ B

(4) $C>E>A>B>D$

Show Answer

Answer: (4)

Solution:

Formula: Hydration enthalpy of alkali and alkaline earth metals

Hydration enthalpies:

(i) $K^{+}>Rb^{+}>Cs^{+}$: (A) $>$(B) $>$(D)

(ii) $Mg^{+2}>Ca^{+2}:(C)>$ (E)

Option (D)

(C) $>$ (E) $>($ A $)>($ B $)>($ D $)$