MCQ
The correct formula of borax is
- A$Na_2[B_4O_4(OH)_3].9 H_2O$
- ✓$Na_2[B_4O_5(OH)_4].8 H_2O$
- C$Na_2[B_4O_6(OH)_5].7 H_2O$
- D$Na_2[B_4O_7(OH)_6].6 H_2O$
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${C_{10}}{H_{22}} \xrightarrow{900\,K} {C_4}{H_8} + {C_6}{H_{14}}$

$C (diamond) + O_2 \rightarrow CO_2(g)\ ;\Delta H =\ -97.6\ kcal$
$C (graphite) + O_2 \rightarrow CO_2(g)\ ;\Delta H =\ -94.3\ kcal$
The heat change for the conversion of $1\ g$ of $C (diamond) \rightarrow C (graphite)$ is