1.

(A) as important laboratory reagent, turn red litmus blue imparts golden yellow colour in flame and is a gas precipitating agent, (A) reacts with Zn or AI forming H_(2)gas(A)gives while ppt with ZnCI_(2) or AICI_(3) but ppt . Diwsolves in exces of (A), what is (A) and explain reaction

Answer»

Solution :(A)turns blue litmus red` rArr (A)` is basic in nature
(A) imparts golden yellow colour in flame `rArr` (A) has `Na^(o+)`
(A) gives `H_(2)` gaswith `Zn` or `AI rArr `(A) is `NaOH`.
EXPLANATION:
`2NaOH +Zn rarr Na_(2) ZnO_(2) +H_(2) uarr`
`2NaOH + 2H_(2)O +2AI rarr 2NaAIO_(2) +3H_(2)uarr`
`ZnCI_(2) +2NaOH rarr underset("White PPT")(Zn(OH)_(2)) darr +2NaCI`
`Zn(OH)_(2) +2NaOH rarr underset("SODIUM zincate")(Na_(2)[Zn(OH)_(4)]) or Na_(2)ZnO_(2)`
`AICI_(3) +3NaOH rarr underset("White ppt.")(AI(OH(_(3) darr) +3NaCI`
`AI(OH)_(3) +NaOH rarr underset("Sodium meta-aluminate")(Na[AI(OH)_(4)] or NaAIO_(2))`


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