See Answer
1: (b) Exothermic, 2: (a) Endothermic, 3: (a) Combination, 4: (a) White, 5: (b) Silver chloride, 6: (a) White, 7: (b) Barium sulphate, 8: (d) Both a and b, 9: (a) Lead iodide, 10: (a) Solid, 11: (c) Yellow, 12: (c) Hydrogen sulphide, 13: (a) Rotten egg, 14: (b) Water, 15: (c) Both a and b, 16: (b) Horizontal arrow sign, 17: (a) Reactants, 18: (a) Multiplying the reactants and products with suitable Arabic numbers, 19: (c) Gas, 20: (b) Liquid