Question

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1. Multiple Choice Question.

4

i) When we suffer from acidity, we should take

a) iron tonic b) vitamins c) antacid d) lactocalamine

ii) Which of the following is basic in nature?

a) Lime water b) baking soda c) both (a) and (b) d) lemon juice

iii) Which of the following is a natural indicator?

a) China rose petal b) turmeric c) litmus d) all of these

iv) Rusting of iron is a -------

a) Physical change b) chemical change c) both (a) and (b) d) all of these

2. Fill in the blanks in the following statements.

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a) The chemical name of baking soda is________

b) Substances which are neither acidic nor basic are called____

c) Litmus is extracted from _____

d) Spinach contains ______ acid.

1. Match the pair.

2

A B

1) Lactic acid a) process of formation of crystals

2) Acetic acid b) curd

3) Crystallization c) vinegar

4) Physical change d) Irreversible

e) Reversible
4. Write true or false. If it is false correct the false statement.

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a) Condensation of steam is not a chemical change.

b) Iron and rust are the same substance.

5. Answer the following question.

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1) Why rusting of iron object is faster in coastal areas than in deserts? Explain.

2) How would you show that setting of curd is a chemical change?

3) Describe the process of neutralization with the help of an example.

4) State difference between acids and bases.

5) When baking soda is mixed with lemon juice, bubbles are formed with the evolution

of a gas. What type of change is it? Explain.

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Answer 1

Answer:

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Answer 2

Answer:

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Explanation:

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For multiple choice

1) C is the answer

2)D is the answer

3) B is the answer

4)D is the answer

this much I know

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