`B+underset(conc.)(HNO_(3))tounderset("white solid")(A)+underset("brown gas")(B)`
How many of the following statements are correct regarding products (A) & (B) ?
(1) `(A)` can be prepared by reacting borax with dilute acids.
(2) `(A)` is a weak monobasic lewis acid.
(3) `(A)` behaves like an electrolyte when dissolved in water.
(4) `(A)` can be prepared by reacting colemanite, `SO_(2)` & `H_(2)O`
(5) `(B)` is paramagnetic in nature.
(6) `(B)` is a mixed anhydride.
(7) `(B)` does not forms a dimer
(8) `(B)` reacts with `NaOH(aq)` undergoing disproportionation.
(9) Bond angle about central atom is greater in `(A)` than in `(B)`. (Assume atom forming maximum number of bonds as central atom)

Explanation

`2B+6HNO_(3)("conc")to underset((A))(2H_(3)BO_(3))+underset((B))(6NO_(2))`
`NO_(2)` forms a dimer `N_(2)O_(4)` (diamagnetic white solid)
Bond angle about Boron in `H_(3)BO_(3)(=120^(@))` is less than bond angle about `N` in `NO_(2)(132^(@))`