See Answer
1: (d) Methyl orange, 2: (a) Onion, 3: (b) Metal salt is formed, 4: (d) All of these, 5: (c) Neutralization, 6: (a) Hydrogen ion, 7: (c) Seven, 8: (c) Seven, 9: (d) More than 7, 10: (b) Less than 7, 11: (a) Half, 12: (b) Sodium carbonate, 13: (c) Sodium bicarbonate, 14: (a) Sodium chloride, 15: (d) Acetic acid