Name the following

1. Three natural indicators.

Ans. Natural indicators : litmus, rose petals & turmeric.

2. Three synthetic indicators.

Ans. Synthetic indicators : phenolphthalein, methyl orange & eosin.

3. Two olfactory indicators.

Ans. Olfactory Indicators : Eucalyptus oil, clove oil.

4. A sodium compound used for softening hard water.

Ans. Sodium carbonate (Na₂CO₃), is used for softening hard water.

5. The compound used for disinfecting drinking water.

Ans. Bleaching powder (CaOCl₂)

6. An alkali which reacts with metal, liberating hydrogen gas.

Ans. Sodium hydroxide reacts with metal liberates hydrogen gas.

7. The real bleaching agent present in bleaching powder.

Ans. Chlorine (Cl₂)

8. The scale used for measuring hydrogen ion concentration in a solution.

Ans. p^H scale.

Natural indicators, Olfactory Indicators, Sodium carbonate, hydrogen ion,Bleaching powder