To a solution of substance, gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of `NH_(4)OH`. However, when HCl is added to the original solution, a white precipitate is formed. The solution containedA. Lead saltB. Silver saltC. Mercurous saltD. Copper salt

To a solution of substance, gradual addition of ammonium hydroxide res

1.	To a solution of substance, gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of `NH_(4)OH`. However, when HCl is added to the original solution, a white precipitate is formed. The solution containedA. Lead saltB. Silver saltC. Mercurous saltD. Copper salt
Answer» Correct Answer - C `Hg_(2)Cl_(2)` is white insoluble salt. `Hg_(2)Cl_(2)+2NH_(4)OH to Hg+HGunderset("Black")ubrace((NH_(2))Cl+NH_(4)Cl)+2H_(2)O`

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Phosphoric acid `(H_(3)PO_(4))` is tribasic acid and one of its salt is sodium dihydrogen phosphate `(NaH_(2)PO_(4))`. What volume of 1 M NaOH solution should be added to 12 g of sodium dihydrogen phosphate (mol. Wt. 120) to exactly convert it into trisodium phosphate `Na_(3)PO_(4)`A. 80 mlB. 100 mlC. 200 mlD. 300 ml
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