Chemistry

Sodium phenoxide is resonance stabilized hence phenol is most easily soluble in aqueous alkali.

For a multi electron system, the energy of orbitals increase with increase in (n + l) value.

For same n + l value, the orbital with higher value of n has higher energy.

So₂ is the component of classical smog.

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