8.2 Organic chemistry isomerism — Chemistry STD 11 Science — Question

$4B(s) + 3O_2\,(g) \rightarrow 2B_2O_3\,(g)$  ; $E^o_{cell} = 1.433$ $volt$  What is molar entropy (in $J/K$) of oxygen gas

Given ${\left( {{\Delta _f}{H^o}} \right)_{{B_2}{O_3}}}\left( g \right) =  - 840\,\frac{{KJ}}{{mol}}$

${\left( {S_m^o} \right)_{{B_2}{O_3}}} \left( g \right) = 280J/K - mol$ 

${{(S_{m}^{o})}_{B}}\,\,\left( s \right)=10\,J/K-mol$

Consider the following statements about borax :

$a.$  Each boron atom has four $B-O$ bonds

$b.$  Each boron atom has three $B-O$ bonds

$c.$  Two boron atoms have four $B-O$ bonds while other two have three $B-O$ bonds

$d.$  Each boron atom has one $-OH$ groups

Select correct statement(s) :