(a)
Interpretation:
Balanced
Concept introduction:
Oxidation number of Sc in Sc2O3 = +3
Oxidation number of Sc inNa3ScF6 = +3
(b)
Interpretation:
Balanced chemical reaction for Cr(s) reacts with HCl(aq) to produce a blue solution containing Cr2+ should be written.
Concept introduction:
Cr(s) is in its lowest oxidation state of zero. In order to go for higher oxidation state of +2; it should be oxidized.
(c)
Interpretation:
Balanced chemical reaction for Cr2+(aq) is readily oxidized by O2(g) Cr3+(aq) should be written.
Concept introduction:
When Cr2+ oxidized into Cr3+; O2 gas act as the oxidizing agent.
(d)
Interpretation:
Reaction for Ag(s) reacts with concentrated HNO3 and NO2(g)is evolved; the balanced chemical should be written.
Concept introduction:
Concentrated nitric acid can oxidize Ag(s) to Ag+.
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GENERAL CHEMISTRY-MOD.MASTERINGCHEM.
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