MCQ Questions

Question No. 1

Answer the following questions regarding deliquescent, efflorescent and hygroscopic:

Answer :

(a) What is called deliquescent? Give examples.

(b) Explain the terms efflorescence and hygroscopic.

(c) How would you demonstrate which property is possessed by washing soda and calcium chloride?

Question No. 2

Refer to Table 8.5 and state if the following salts are soluble or insoluble in water:

Answer :

(a) BaSO₄

(b) (NH₄ )₂CO₃

(c) AgBr

(d) CH₃COONa

(e) MgO

Question No. 3

Match each term in Column B with the correct description in Column A. Write down only the question number and the letter.

Answer :

Question No. 4

Name the salts that will form in these reactions:

Answer :

(a) HCl + Zn

(b) H₂SO₄ + CuCO₃

(c) HNO₃ + NaOH

Question No. 5

Answer the following question :

Answer :

(a) What are the general characteristics of acids?

(b) You have two solutions, A and B. The pH of solution A is 6 and the pH of solution B is 8. Which solution has more hydrogen ions in solution? Which one of these is acidic and which one is basic?

(c) Distinguish between the various places where the knowledge of pH values is put to use.

Question No. 6

The gastric juice that the stomach secretes contains hydrochloric acid. Sometimes there is an overproduction of hydrochloric acid, leading to heartburn and indigestion. Antacids, such as milk of magnesia (Mg(OH)2 ), can be taken to neutralise the excess acid.

Answer :

(a) Define an acid according to the Brønsted-Lowry theory.

(b) Define a base according to the Brønsted-Lowry theory.

(c) Use a chemical equation to show how hydrochloric acid ionises in water.

(d) Write a balanced chemical equation to show how the antacid reacts with the acid in the stomach.

Question No. 7

Bases colour litmus:

Answer :

blue

red

purple

green

Question No. 8

Which is NOT a property of acids?

Answer :

Bitter taste

Feels rough on the skin

Is corrosive

Turns litmus red

Question No. 9

Which is an acidic solution?

Answer :

Salt water

Sugar water

Soapy water

Fruit juice

Question No. 10

When an acid reacts with a carbonate, the product/s is/are:

Answer :

water

water and a salt

water, a salt and carbon dioxide

carbon dioxide

Question No. 11

Which liquid CANNOT be used as an indicator?

Answer :

Sodium hydroxide

Bromothymol blue

Litmus

Extract from red flowers

Chapter

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