Consider the following statements:(i) Na_2O

Question

(D) $(i)$ Acidic property increases with the increase in oxidation number of the central atom and for the same oxidation number,acidic nature increase

Vedclass · Accepted Answer

Vedclass · Answer

(D) $(i)$ Acidic property increases with the increase in oxidation number of the central atom and for the same oxidation number,acidic nature increases along the period. Thus,$Na_2O$ (basic) $$(ii)$ The electron gain enthalpy of $Cl$ is more negative than that of $F$ due to the small size and inter-electronic repulsion in $F$. The order is $Cl > F > Br$. Thus,this statement is False $(F)$.$(iii)$ Ionic size increases with an increase in the number of electrons (anions) and decreases with a loss of electrons (cations). The order $M^{2-} > M^{-} > M^{+} > M^{2+}$ is correct. This statement is True $(T)$.$(iv)$ The second ionisation enthalpy involves removing an electron from $M^{+}$ ion. $K^{+}$ has a stable noble gas configuration $([Ar])$,while $Cu^{+}$ has a $d^{10}$ configuration. Removing an electron from the stable noble gas configuration of $K^{+}$ requires much more energy than from $Cu^{+}$. Thus,the second ionisation enthalpy of $K$ is greater than that of $Cu$. This statement is False $(F)$.Therefore,the correct sequence is $(i)-T, (ii)-F, (iii)-T, (iv)-F$. The correct option is $(d)$.

Column $I$ (Element types)	Column $II$ (Electronic configuration)
$A$. Inert-gas elements	$1. (n-1)d^{1-10} ns^{1-2}$
$B$. Transition elements	$2. ns^2 np^6$
$C$. Inner-transition elements	$3. (n-2)f^{1-14} (n-1)s^2 p^6 d^{0-1} ns^2$

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