Question

11. Name two synthetic indicators which are used to test acids and bases.
12. What is aqua regia?
13. Name the metals which are soluble in aqua regia.
14. Why does HCI (9) not conduct electricity when dissolved in toluene?
15. Is toothpaste acidic or alkaline?
16. A bud of petunia became reddish purple after first shower of rain. What does it indicate ?
17. Name the natural source each of the following acids
(a) Citric acid (b) Oxalic acid(c) Lactic acid (d) Tartaric acid
18. a) Define olfactory indicators. Name two substances which can be used as olfactory indicators.
(b) Choose strong acids from the following: CH,COOH, H,SO., H.CO, HNO,
19. Explain the action of dilute hydrochloric acid on the following with chemical equations:
(a) Magnesium ribbon (b) Sodium hydroxide (c) Crushed egg shells
20. Name the products formed in each case when(a) hydrochloric acid reacts with caustic soda.
(b) granulated zinc reacts with caustic soda. (c) carbon dioxide is passed into lime water.​

Answer 1

Phenolapthelin and methyl orange are the two indicators

Answer 2

Answer:

Aqua regia is a liquid by which gold and silver are cleaned