NEETChemistryp Block Elements (Group 13 & 14)
Identify the correct statements from the following: (a) In Orthoboric acid, boron is in planar geometry. (b) In BCl 3 · NH 3 , boron has tetrahedral geometry. (c) Aqueous solution of borax is acidic.
Options
- Aa ,   b
- B  b ,   c
- C  a ,   c
- D  a ,   b ,   c
Correct answer
A. a ,   b
Step-by-step solution
1 . In orthoboric acid H 3 BO 3 , boron is sp 2 hybridized and thus is in planar geometry. 2 . In BCl 3 . NH 3 , Boron and Nitrogen ( N ) are both s p 3 hybridized and the shape of the adduct is tetrahedral . 3 . Combination of a strong base and a weak acid results in a salt which is basic in nature. Borax is a salt which is formed by the reaction of NaOH (strong base) with H 3 BO 3 (weak acid). Thus, the aqueous solution of borax is basic and not acidic.