Which of the following hydride of chalcogens has lowest bond angle and highest bond length?
$\quad \mathrm{H}_2 \mathrm{~S}$
$\mathrm{H}_2 \mathrm{Se}$
$\mathrm{H}_2 \mathrm{Te}$
$\mathrm{H}_2 \mathrm{O}$
What type of solution is the benzoic acid in benzene?
Solid as solvent and solid as solute.
Liquid as solvent and solid as solute.
Solid as solvent and liquid as solute.
Liquid as solute and liquid as solvent.
The solubility product of $\mathrm{PbI}_2$ is $2.8 \times 10^{-8}$. Calculate its solubility in $\mathrm{mol} \mathrm{dm}^{-3}$.
$1.323 \times 10^{-3}$
$1.912 \times 10^{-3}$
$7.912 \times 10^{-3}$
$7.323 \times 10^{-23}$
When forward bias is applied to a p-n junction, then the potential barrier and the width of the depletion region respectively.
increases, increases.
decreases, increases.
increases, decreases.
decreases, decreases.
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