The complex used as an anti-cancer agent is
mer-[Co(NH3)3Cl3]
cis-[PtCl2(NH3)2]
cis-K2[PtCl2Br2]
Na2[CoCl4]
In the extraction of copper from sulphide ore the metal is formed by reduction of Cu2O with
FeS
CO
Cu2S
SO2
A.
FeS
Iron has greater affinity for oxygen as compared to copper.
Cu2O + FeS → FeO + Cu2S
FeO + SO2 → FeSiO3
2Cu2O + 3O2 → 2Cu2O + 2SO2
2Cu2O + Cu2S 6Cu + SO2
Which one of the statements given below concerning properties of solutions, describes a colligative effect?
Boiling point of pure water decreases by the addition of ethanol.
Vapour pressure of pure water decreases by the addition of nitric acid.
Vapour pressure of pure benzene decreases by the addition of naphthalene.
Boiling point of pure benzene increases by the addition of toluene.
Which of the following reactions is used to make a fuel cell?
Cd(s) + 2Ni(OH)3 → CdO(s) + 2Ni(OH)2(s) + H2O(l)
Pb(s) + PbO2(s) + 2H2SO4(aq) → 2PbSO4(s) + 2H2O(l)
2H2(g) + O2(g) →6 2H2O(l)
2Fe(s) + O2(g) + 4H+ (aq) → 2Fe2+(aq) + 2H2O(l)