A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?

Which of the following statements about the given reaction are correct?

3Fe(s) + 4H₂O(g) → Fe₃O₄(s) + 4H₂(g)

(i) Iron metal is getting oxidised

(ii) Water is getting reduced

(iii) Water is acting as reducing agent

(iv) Water is acting as oxidizing agent

Which of the following are exothermic processes?

(i) Reaction of water with quicklime

(ii) Dilution of an acid

(iii) Evaporation of water

(iv) Sublimation of camphor (crystals)

Which among the following is (are) double displacement reaction(s)?

(i) Pb + CuCl₂→ PbCl₂ + Cu

(ii) Na₂SO₄ + BaCl₂→ BaSO₄ + 2NaCl

(iii) C + O₂→ CO₂

(iv) CH₄ + 2O₂→ CO₂ + 2H₂O

Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to:

(i) The formation of silver by decomposition of silver chloride

(ii) Sublimation of silver chloride

(iii) Decomposition of chlorine gas from silver chloride

(iv) Oxidation of silver chloride