STD 12 - 4. d and f- block elements — NEET STD 11 Science — Question

$\lambda_{\mathrm{m}\left(\mathrm{H}_{2} \mathrm{SO}_{4}\right)}^{0}=\mathrm{x} \;\mathrm{S}\; \mathrm{cm}^{2} \mathrm{mol}^{-1}$

$\lambda_{\mathrm{m}\left(\mathrm{K}_{2} \mathrm{SO}_{4}\right)}^{0}=\mathrm{y} \;\mathrm{S\;cm}^{2} \mathrm{mol}^{-1}$

$\lambda_{\mathrm{m}(\mathrm{CH_3} \mathrm{COOK})}^{0}=\mathrm{z}\; \mathrm{S\;cm}^{2} \mathrm{mol}^{-1}$

$\lambda_{\mathrm{m}}^{0}\left(\mathrm{in}\; \mathrm{S} \;\mathrm{cm}^{2} \mathrm{mol}^{-1}\right)$ for $\mathrm{CH}_{3} \mathrm{COOH}$ will be

$(A)$ Total number of valence shell electrons at metal centre in $Fe ( CO )_5$ or $Ni ( CO )_4$ is $16$

$(B)$ These are predominantly low spin in nature

$(C)$ Metal-carbon bond strengthens when the oxidation state of the metal is lowered

$(D)$ The carbonyl $C - O$ bond weakens when the oxidation state of the metal is increased