Chemistry

HF molecules are associated with strong intermolecular hydrogen bonding hence its boiling point is the highest

s – block and p – block elements together are called as representative elements.

Zn (Z = 30) is a d-block element.

$Be{\left(OH\right)}_2$ is amphoteric in nature

$Be{\left(OH\right)}_2+2O{H}^{-}\to {\left. [Be{\left(OH\right)}_4\right]}^{2-}$

Generally, $?iH$ decreases down the group but Pb has higher $?iH$  than Sn due to poor shielding effect of intervening d and f orbitals.

Brompheniramine (Dimetapp) acts as antihistamine

High density polythene is chemically inert

$C{H}_{3}C{H}_{2}N{O}_2\stackrel{573K}{\to }C{H}_2=C{H}_2+HN{O}_2$

Kindly consider the following figure

Kindly consider the following figure

Sulphuric acid, because of its low volatility can be used to manufacture more volatile acids from their corresponding salts.

^{$2MX+H_{2}S{O}_4\to 2HX+M_{2}S{O}_4\left(X=F,Cl,N{O}_3\right)$}