Ncert Solutions Chemistry Class 11th

  $2Cl\left(g\right)\to C{l}_2\left(g\right)$ is exothermic process so $?H<0$ $$

$?n_g<0so,?S<0$

$Ca{H}_2+2H_{2}O\to Ca{\left(OH\right)}_2+2H_2\left(g\right)$

(Hydrolith)

$CaC{O}_3\left(s\right)\to CaO\left(s\right)+C{O}_2\left(g\right)$

1 mol 1 mol

100 g 22.4 L at STP

Volume of ${}_{}$ $C{O}_2$ obtained $=22.4\times \frac{25}{100}=5.6L$ $\frac{}{}$ at STP

Kindly consider the following figure

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

$Be{\left(OH\right)}_2$ 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.

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

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

Compound             Melting Point (K)

HF                          190

HCl        

Classical smog contains SO₂.