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Q65) Which form coloured salts? [ CPMT 1984]




SOLUTION


Answer: (d)


Q66) Which of the following dissolves in hot conc. NaOH? [ IIT 1980]




SOLUTION

Zn + 2NaOH + 2H2O → Na2[Zn(OH)4] + H2
Answer: (b)


Q67) In the metallurgy of iron, when lime stone is added to the blast furnace, the calcium ion ends up in [ IIT 1982]



SOLUTION

CaCo3 → CaO + CO2
CaO + siO2 → CaSiO3 ( slag)
Answer:(a)



Q68) AgCl dissolves in a solution of NH3 but not in water because ..[ MP PMT 1986]



SOLUTION

AgCl + 2NH4OH → [Ag(NH3)2]Cl + 2H2O
Answer: (b)


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