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Q97) Which does not form amalgam [ AFMC 1988]




SOLUTION


Answer: (a)


Q98) A metal gives two chlorides A and B, A gives black precipitate with NaOH and B gives white. With KI, B gives a red precipitate which is soluble in excess of KI. And B are respectively. [ MP PMT 1988]




SOLUTION

(A)
Hg2Cl2 + 2NH4 → Hg + NH2hgCl (black ppt) + NH4Cl + 2H2O
(B)
HgCl2 + 2KI → HgI2(red ppt) + 2KCl
HgI2 + 2KI → K2[HgI4] (soluble)
Answer: (b)


Q99) From argentite Ag2S ore the method used in obtaining metallic silver is .. [ MP PMT 1989]



SOLUTION

2Ag2S + 8NaCN + O2 + 2H2O → 4Na[Ag(CN)2] + 4NaOH + 2S
2Na[Ag(CN)2] + Zn → Na2[Zn(CN)2] + 2Ag ↓
Answer:(d)



Q100) Iron is manufactured form [ CPMT 1989]



SOLUTION


Answer: (c)


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