Which of the following precipitate(s) does /do not dissolve in excess of ammonia solution ?
Which of the following precipitate(s) does /do not dissolve in excess of ammonia solution ?
A. `Zn(OH)_(2)`
B. `Ni(OH)_(2)`
C. `Al(OH)_(3)`
D. B and C both
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Correct Answer - C
(A)`Zn(OH)_(2)+4NH_(3)rarr[Zn(NH_(3))_(4)]^(2+)`(colourless solution)+`20H^(-)`
(B)`Ni(OH)_(2) darr +6NH_(3)rarr[Ni(NH_(3))_(6)]^(2+)`(deep blue solution)+`20H^(-)`
( C)`Al(OH)_(3)+NH_(3)to`No reaction.
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