Question

1.
A. Choose the correct option for each of the following.
Manu dropped a horseshoe made of iron into a copper sulphate solution. After
some time, he found that the horseshoe had a brown deposit on it. This was due to
the formation of
(a) iron sulphate (b) iron
(c) copper
(d) copper sulphate
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
their symbol.
Which of these is the correct sequence of writing the chemical formula?
(a) i. ii. iii. iv. (b) i. iii. ii. iv. (c) i. iv. ii. iii. (d) i. iii. iv. ii.
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Answer 1

Answer:

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Answer 2

Answer:

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