Lead is soluble in

$A$. 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.

Choose the correct answer from the options given below:

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The most stable carbocation for the following is:

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$C_8H_{18}$ ($A$) on mono chlorination forms only one type of $C_8H_{17}Cl\ \ (B)$ Hence ($A$) can be

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The ionic radii of $\mathrm{F}^{-}$ and $O^{2-}$ respectively are $1.33\, A^o$ and $1.4\, A^o$, while the covalent radius of $\mathrm{N}$ is $0.74\,A^o$

The correct statement for the ionic radius of $\mathrm{N}^{3-}$ from the following is :

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The ‘epimerisation’ involves

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If reaction is started with $NH_4COONH_2(s)$ and equilibrium mixture has pressure of $3\, atm$ then $K_P$ for $NH_4COONH_2(s) \rightleftharpoons 2NH_3(g) + CO_2(g)$ is .....$atm^3$

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The entropy change when $2\, moles$ of ideal monoatomic gas is heated from $200\,^oC$ to $300\,^oC$ and isochorically

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Methyl acetate and propionic acid are

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Calculate $\Lambda _{HOAc}^\infty $ using appropriate molar conductances of the electrolytes listed above at infinite dilution in ${H_2}O$ at $25\,^o\, C$

Electrolyte :	$KCl$	$KNO_3$	$HCl$	$NaOAc$	$NaCl$
$\Lambda ^\infty (Scm^2mol^{-1}) $:	$149.9$	$145.0$	$426.2$	$91.0$	$126.5$

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STD 11 -p-Block elements - I — JEE STD 11 Science — Question

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