Acid, Base & Salt

MCQs:3

Question: 21. Which acid is found in nettle sting?

1. Citric acid
2. Formic acid
3. Tartaric acid
4. Nitric acid

Answer: (b) Formic acid

Question: 22. Which acid is found in bee sting?

1. Citric acid
2. Formic acid
3. Tartaric acid
4. Nitric acid

Answer: (b) Formic acid

Question: 23. Rubbing of which does give relief from pain in the case of bee sting?

1. Dilute hydrochloric acid
2. Dilute nitric acid
3. Tooth paste
4. Alkali

Answer: (c) Tooth paste

Explanation: Tooth paste contains mild base which neutralize the acid injected with bee sting. Alkali is a corrosive base. Applying alkali will prove dangerous to skin.

Question: 24. Which statement is correct?

1. Organic acids are obtain from natural sources
2. Inorganic acids are prepared in laboratory
3. Bee sting contains formic sting
4. All of the above

Answer: (d) All of the above

Question: 25. What happens when acid is mixed with water?

1. Heat is evolved
2. Heat is absorbed
3. Concentration of acid increases
4. All of the above

Answer: (a) Heat is evolved

Question: 26. What happens when an alkali is mixed with water?

1. Heat is evolved
2. Heat is absorbed
3. Concentration of acid increases
4. All of the above

Answer: (a) Heat is evolved

Question: 27. Which of the following is alkali?

1. Sodium hydroxide
2. Calcium carbonate
3. Copper carbonate
4. Carbonic acid

Answer: (a) Sodium hydroxide

Question: 28. Which of the following is called alkali?

1. Water soluble base
2. Water insoluble base
3. Carbonate of metals
4. Oxides of metals

Answer: (a) Water soluble base

Question: 29. What happens when an acid react with base?

1. Acid neutralizes base
2. Water is formed
3. A salt is formed
4. All of the above

Answer: (d) All of the above

Question: 30. Which of the following is an olfactory indicator?

1. Turmeric
2. Onion
3. Litmus
4. All of the above

Answer: (b) Onion