The p -Block Elements

B (OH)₃ is orthoboric acid having acidic nature, while Al (OH)₃ has amphoteric nature that is acidic and as well as basic

B (OH)₃ is orthoboric acid having acidic nature, while Al (OH)₃ has amphoteric nature that is acidic and as well as basic

Ionic radii of cations is smaller than anions, also more the positive charge less be the ionic radii and more the negative charge more be the ionic radii. Hence correct order of ionic radii is, $p^{3-}>S^{2-}>C{l}^{-}>K^{+}>C{a}^{2+}$

Hydroxyapatite is the calcium minerals whose molecular formula is $3C{a}_3{\left(P{O}_4\right)}_2.Ca{\left(OH\right)}_2$ ${}_{}{{}_{}}_{}{}_{}$ or $C{a}_{10}{\left(P{O}_4\right)}_6{\left(OH\right)}_2.$ ${}_{}{{}_{}}_{}{}_{}$ During contact with water dissolved F ion, hydroxyapatite converted into ${}_{}{{}_{}}_{}{}_{}$ $3C{a}_3{\left(P{O}_4\right)}_2.Ca{F}_2$ .

$K{O}_2,N{O}_2,Cl{O}_2,NO$ are paramagnetic.

Acidic oxides : $B_2{O}_3,P_4{O}_{10},S{O}_3,N_2{O}_5$  

Neutral oxide : $N_{2}O,$  NO, CO

$B{r}_2+5F_2\left(excess\right)\to 2Br{F}_5$

$Br{F}_5+3H_{2}O\to HBr{O}_3+5HF$

Be₂Cl₄ is Lewis acid and Al₂Cl₆ has complete octet. Be and Al are amphoteric metal therefore dissolve in acid as well as alkaline solution and form beryllate and aluminate ions in excess alkali.

${\left(N{H}_4\right)}_{2}C{r}_2{O}_7\underset{}{\overset{\Delta }{\to }}\boxed{N_2}+C{r}_2{O}_3+4H_{2}O$

$KMn{O}_4+HC\mathcal{l}\to MnC{\mathcal{l}}_2+KC\mathcal{l}+\boxed{C{\mathcal{l}}_2}+H_{2}O$

$A\mathcal{l}+NaOH+H_{2}O\to Na\left[A\mathcal{l}{\left(OH\right)}_4\right]+\boxed{H_2}$

$NaN{O}_3\to NaN{O}_2+\boxed{O_2}$

$K{O}_2,N{O}_2,Cl{O}_2,NO$ are paramagnetic.