Question

2. Browning of fruits is an example of
(a) Physical change (b) Chemical change (c) Both of these (d) None of these
3. Which of the following is not a chemical change?
(a) Inflating a balloon (b) Burning candle (c) Heating sugar (d) Rusting of iron
4. Iron forms rust when it reacts with
(a) Hydrogen and oxygen
(b) Oxygen and moisture (water)
(c) Carbon dioxide and hydrogen (d) Water and carbon dioxide
5. The steps involved in writing the chemical formula of a substance are given below:
i. Write the symbols of the elements.
ii. If the valencies are identical, cancel the valencies.
iii. Write the valency of the elements.
iv. If the valencies are different, criss-cross and place them with reference to the symbol.
Which of these is the correct sequence of writing the chemical formula?
(a) i. ii. iii. iv.
(b) i. ii. ii. iv. (c) i. iv. ii.iii. (d) i. iii. iv. ii.
5
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Answer 1

Answer:

2. (a)Physical change

3. (c)Heating sugar

4. (b) Oxygen and moisture

5. (d) i,iii,iv,ii

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Explanation:

Answer 2

Answer

Q2-c both of these

Q3-a inflating a balloon

Q4-b oxygen and moisture

Q5-a i ii iii iv

Explanation:

Q2- browning of a fruit is chemical as well as a physical change as both chemical and physical properties are changing

Q3- inflating a balloon is a physical change as its size is increasing

Q4- Iron reacts with oxygen and moisture

fe+o2= fe2o3

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