Question

Which
order
is
correct
1. B2O3 > CO2 > N2O3 (acidic)
2. Beo > MgO x Al2O3 (basic)
3. CaO > ZnO > Al2O3 (acidic)
4. Co2 > B2O3 > Al2O3 (acidic)​

Answer 1

The correct order is  $CO_{2} > B_{2} CO_{3} > Al_{2} O_{3} \ (acidic)$and option (4) is correct.

Explanation:

$CO_{2} > B_{2} CO_{3} > Al_{2} O_{3} \ (acidic)$

The acidic oxide $CO_{2}$.

$CO_{2} +2NaOH\rightarrow Na_{2}CO_{3} +H_{2} O$

The acidic oxide $B_{2} CO_{3}$.

​$B_{2}O_{3} +2NaOH\rightarrow 2NaBO_{2} +H_{2} O$

The amphoteric oxide is $Al_{2} O_{3}$.

$Al_{2}O_{3} +2NaOH\rightarrow 2NaAlO_{2} +H_{2} O$

$Al_{2}O_{3} +3H_{2} SO_{4} \rightarrow Al_{2} (SO_{4})_{3} +3H_{2} O$

Thus, the correct order is  $CO_{2} > B_{2} CO_{3} > Al_{2} O_{3} \ (acidic)$and option (4) is correct.

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