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In the reaction with sodium hydroxide, how many of the following substances are oxidized ?
Be, B, C, Al, Si, P, S, Sn, Pb, ${NH}_{4}^{+},$ FeCl₃, AlCl₃, SnCl₂

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answer is 9.

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Detailed Solution

2Al+2NaOH+H₂O→2NaAlO₂+3H₂↑

Sn+2NaOH+H₂O→Na₂SnO₃+2H₂↑

Pb+2NaOH+H₂O→Na₂PbO₃+2H₂↑

Si+2NaOH+H₂O→Na₂SiO₃+2H₂↑

P₄+3NaOH+3H₂O→PH₃↑+3NaH₂PO₂

Be+ NaOH +H₂O→Na₂BeO₂+2H₂↑

4S+6NaOH→Na₂S₂O₃ +2Na₂S+3H₂O

B+6NaOH→2Na₃BO₃+3H2.

6NaOH+C → 2Na+3H₂ +2Na₂CO₃

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