an alkali metal A gives a compound molecular=40 on reacting with water. the compound B gives a soluble compound C on treatment with aluminium oxide . identified A,B,C GIVE THE REACTION INVOlved.

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Solution

The alkali metal A is sodium (Na), compound B is sodium hydroxide (NaOH) and compound C is sodium aluminate (NaAlO₂).
(1) The reaction of sodium and water is as shown as follows
2Na + 2H₂O â†’ 2NaOH + H₂
(2) The reaction of sodium hydroxide with Al₂O₃ is shown as follows
Al₂O₃ + 2NaOH â†’ 2NaAlO₂ + H₂O

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