Question
Give two similarities and one difference between Boron and Aluminium.
✓
Answer
Similarities:
$\mathrm{B}_2 \mathrm{O}_3$, is acidic oxide whereas $\mathrm{Al}_2 \mathrm{O}_3$ is amphoteric oxide.
- Both show valency equal to 3.
- Both form oxides with similar formula $\mathrm{B}_2 \mathrm{O}_3$, $\mathrm{Al}_2 \mathrm{O}_3$.
$\mathrm{B}_2 \mathrm{O}_3$, is acidic oxide whereas $\mathrm{Al}_2 \mathrm{O}_3$ is amphoteric oxide.
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$
\begin{array}{l}
2 C(s)+2 H_2(g)=C_2 H_4(g) ; \Delta H=52.6 kJ \\
C(s) \rightarrow C(g) ; \Delta H=716.68 kJ \\
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\end{array}
$
→$
\begin{array}{l}
2 C(s)+2 H_2(g)=C_2 H_4(g) ; \Delta H=52.6 kJ \\
C(s) \rightarrow C(g) ; \Delta H=716.68 kJ \\
H_2(g)=2 H(g) ; \Delta H=435.84 kJ \\
\text { and } C-H \text { bond energy }=+413 kJ
\end{array}
$
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