Chemistry - Complete Pblock- Question with Solution | TestHub

Consider following reaction :-

$$\mathrm{Boron}+{\mathrm{HNO}}_3\left(con.\right)\to A\left(whitesolid\right)+B\left(Browngas\right)$$

How many of the following statements are CORRECT regarding products (A)  & (B)?

(i) (A) can be prepared by reacting borax with dilute acids.

(ii) (A) is a weak monobasic acid.

(iii) (A) behaves like an weak electrolyte when dissolved in water.

(iv) (A) can be prepared by reacting colemanite with ${\mathrm{NH}}_3$ and ${\mathrm{H}}_2\mathrm{O}$.

(v) (B) is paramagnetic in nature.

(vi) (B) is a mixed anhydride.

(vii) (B) does not form dimer

(viii) (B) reacts with $\mathrm{NaOH}(\mathrm{aq}$.$)undergoingdisproportionation.$

(ix) Bond angle about central atom is greater in (A) than in (B).