Chemistry

• Natural indicators are Litmus paper,Turmeric
• Synthetic indicators are Phenolphthalein, Methyl
• Olfactory indicators is substance whose odour (smell) change in acidic or basic medium.
• Hydrochloric acid - HCl
• Sulphuric acid - H2SO4
• Nitric acid - HNO3
• Carbonic acid - H2CO3
• Acetic acid - CH3COOH