Which of the following is(are) an endothermic process(es)?

(i) Dilution of sulphuric acid

(ii) Sublimation of dry ice

(iii) Condensation of water vapours

(iv) Evaporation of water

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

In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?

In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?