1.

What happens when?(a) Excess caustic soda is added to a solution of aluminium chloride. (b) Aluminium is heated with caustic soda solution: (c) A mixture of borax and cobalt oxide is heated in flame. (d) (i) BF_(3) reacts with water.(ii) Al_(4)C_(3) reacts with water.

Answer»

Solution : (a) `AICI_(3) + 3NaOHtoAl(OH)_(3) +3NaCI`
`Al(OH)_(3) +NaOHtoNaAlO_(2)+ 2H_(2)O`
(b)` 2AI+2NaOH+2H_(2)Oto2NAIO_(2) +3H_(2)`
(c) `Na_(2)B_(4)O_(7)10_(2)Ooverset(Delta)underset(-10H_(2)O)toNa_(2)B_(4)O_(7)to2NaBO_(2)+B_(2)O_(3)B_(2)O_(3)+CoOtounderset(Cobaitmiabcrbcate)(CO(BO_(2))_(2))`
(d)(i)`4BF_(3)+6H_(2)OtoH_(3)BO_(3)+3H_(3)O+3BF_(4)^(-)`
(II)`AI_(4)C_(3)+12H_(2)Oto4AI(OH)_(3)+3CH_(4)`


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