Chemistry - PERIODIC TABLE Question with Solution | TestHub

(i) Bond angle of${\text{NH}}_3={107}^o$

${\text{PH}}_{\text{3}}>{\text{AsH}}_{\text{3}}={90}^o$

According to bond angle the %s character of lp in${\text{NH}}_3=22\%$while in${\text{PH}}_3\& {\text{AsH}}_3$having approximately 100%, so the donation of lp in${\text{PH}}_3 \& {\text{AsH}}_3$are difficult. Hence, the acidic character increases and the order of acidic character is${\text{NH}}_3<{\text{PH}}_3<{\text{AsH}}_3$is correct

(ii) On moving left to right in a period ionisation energy increases.$\mathrm{Li}<\mathrm{Be}<\mathrm{B}<\mathrm{C}$but the first ionisation potential of$\mathrm{Be}$is higher than that of$\mathrm{B}$because$\mathrm{Be}$has fulfilled configuration.

(iii) Metallic character increases hence the basic character of oxide increases.

(iv) In a group from top to the bottom, the number of the shell increases hence radius increases.