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Q33) Argentite is an ore of .. [ CPMT 1978]




SOLUTION

Argentite is silver glance (Ag2S)
Answer: (d)


Q34) Which of the following is most soluble in water? [ NCERT 1974]




SOLUTION

Solubility of AgX in water decreases with increase is atomic weight of X. Also Ag<2S is insoluble in water
Answer: (b)


Q35) Copper can be extracted from .. [ IIT 1978]



SOLUTION

Malachite is CuCO3 . Cu(OH)2
Answer:(c)



Q36) Substance soluble in ammonia is ... [ MLNR 1984]



SOLUTION

Cu(OH)2 + 4NH4OH → [Cu(NH3)4] (OH)2 + 4H2O
Answer: (d)


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