8.2 Carboxylic acids and their derivative — Chemistry STD 12 Science — Question

$(a)$ Number of $S-S$ bonds in $H_2S_nO_6$ are $(n +1)$

$(b)$ When $F_2$ reacts with $H_2O$ it forms $HF,$ $O_2$ & $O_3.$

$(c)$ $XeF_6$ on hydrolysis shows disproportionation reaction

$(d)$ $Al$ metal on reacting with dilute $NaOH$ gives a white precipitate of $Al (OH)_3$ as a final product

$A$. All group $16$ elements form oxides of general formula $\mathrm{EO}_2$ and $\mathrm{EO}_3$ where $\mathrm{E}=\mathrm{S}, \mathrm{Se}, \mathrm{Te}$ and Po. Both the types of oxides are acidic in nature.

$B$. $\mathrm{TeO}_2$ is an oxidising agent while $\mathrm{SO}_2$ is reducing in nature.

$C$. The reducing property decreases from $\mathrm{H}_2 \mathrm{~S}$ to $\mathrm{H}_2 \mathrm{Te}$ down the group.

$D$. The ozone molecule contains five lone pairs of electrons.

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