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Oxidizing agent: MnO2 (Mn4+ oxidizes Cl-1 to give Cl)
Reducing agent: HCl (Reduces Mn4+ present in MnO2 to give Mn2+ present in MnCl2).
9)(i) A bright yellow precipitate of Lead iodide is observed immediately.
(ii)Double Displacement or Double Decomposition
(iii) 2KI + Pb(NO3)2-----------> 2KNO3 + PbI2↓
10) Three metals which do not generally corrode are gold, platinum and silver or mercury do not corrode that easily on exposure to atmospheric air.
11) Butylated hydroxyanisole (BHA) and BHT (butylated hydroxytoluene).
12) B)H2S is the reducing agent as it reduces sulphur dioxide to water by addition of hydrogen and removal of oxygen. It also changes the oxidation state of sulphur from +4 in sulphur dioxide to 0 in elemental sulphur.
13) A) - iii)
B) - iv)
C) - ii)
D) - i)
E) - v)