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Match the precipitate of the compounds listed in (I) with the solvent(s) listed in column(II). `{:(Column-I,Column-II),((A)Zn(OH)_2"precipitate dissolves in",(p)"Potassium cyanide"),((B)Cr(OH)_3"precipitate dissolves in",(q)"Ammonia"),((C )AgCl"precipitate dissolves in",(r)"Sodium hydroxide"),((D)CuS "precipitate dissolves in",(s)"Sodium peroxide"),(,(t)50% HNO_3):}` |
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Answer» Correct Answer - A`to`q,r,t ; B`to`r,s,t ; C`to`p,q ; D`to`p,s,t (A)`Zn(OH)_2darr+4NH_3(aq)to[Zn(NH_3)_4](OH)_2` (colourless soluble complex) `Zn(OH)_2darr+2NaOH(aq)toNa_2[Zn(OH)_4]` (colourless soluble complex) `Zn(OH)_2 darr + 2H^(+)(aq)toZn^(2+)(aq)+2H_2O(l)` (B)It is slightly soluble in red `Cr(OH)_3darr+6NH_3(aq)to[Cr(NH_3)_6]^(3+)`(pink or violet soluble complex ) +`3OH^-`(aq) `Cr(OH)_3darr+OH^(-)(aq)to[Cr(OH)_4]^(-)`(green soluble complex) `2Cr(OH)_3darr+3Na_2O_2(s)to2Na_2CrO_4`(yellow solution) + 2NaOH (aq) +`2H_2O`(l) `Cr(OH)_3darr+3H^(+)(aq)toCr^(3+)(aq)+3H_2O(l)` (C )`AgCldarr+2NH_3(aq)to[Ag(NH_3)_]Cl`(colourless soluble complex) `AgCldarr+2CN^(-)(aq)to[Ag(CN)_2]^(-)`(colourless soluble complex )+`Cl^-` (aq) Does not dissolve in NaOH, `Na_2O_2` and 50% `HNNO_3` (D)`2CuSdarr+8CN^(-)(aq)to2[Cu(CN)_4]^(3-)` (colourless soluble complex )+`S_2^(2-)` `CuSdarr+Na_2O_2(s)overset(H_2O)toCuSO_4(aq)+NaOH(aq)` CuS `darr`+ `H_2O `(l)`toCuSO_4(aq)` `3CuSdarr+8HNO_3(aq)to3Cu^(2+)(aq)+6NO_3^(-)(aq)+3Sdarr+2NOuarr+4H_2O(l)` |
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