Question

Observe the following statements:
$1.$ $H_{3}B{O}_3$ is used as antiseptic.
$2$. In $B_2{H}_6$ each boron is $s{p}^2$ hybridized.
$3$. Aqueous solution of borax is alkaline in nature.
The correct statements is:

• A. $1,2$ and $3$
• B. $1$ and $3$
• C. $1$ and $2$
• D. $2$ and $3$

Answer 1

Answer: (B)

$1$ and $3$

Statements 1 and 3 are correct. Statement 2 is incorrect.

1) Orthoboric acid is used as an antiseptic, as an eyewash (eye lotion) and as a food preservative.

2) In diborane, each B atom is $s{p}^3$ hybridized. This is according to molecular orbital theory.

3) The aqueous solution of borax is alkaline due to hydrolytic decomposition which produces sodium hydroxide (a strong base) and boric acid (a weak acid).

$N{a}_2{B}_4{O}_7+7H_{2}O\rightleftharpoons 2NaOH+4H_{3}B{O}_3$