Which of these is a reversible change?
(a) milk turning into curd
(b) burning of wax
(c) melting of wax
(d) rusting of iron

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Solution

(c) melting of wax.
The melted wax gets solidified after cooling. The melting of wax, therefore, is a reversible change.

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Question 1

Which of the following is a physical change?
(a) Rusting of iron
(b) Combustion of magnesium ribbon
(c) Burning of candle
(d) Melting of wax

Q. Write True (T) or False (F) against the following statements in the given brackets:
1. Digestion of food is a Q irreversible change. ( )
2. Rusting of iron is a reversible change. ( )
3. Melting of wax is a reversible change. ( )
4. Curding of milk is an irreversible change. ( )
5. Melting of ice cream is a reversible change. ( )

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(a) a burning candle
(b) an extinguished candle
(c) melting wax.
Which of these shows a reversible change and why?

Q. What is common to the changes mentioned below.
the setting of milk into curd; the rusting of iron; the ripening of a mango
(a) They are all reversible changes.
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(d) They are slow irreversible changes.

Question 8

Look at the figures given below, which show three situations (a) burning candle (b) an extinguished candle (c) melting wax.
Which of these shows a reversible change and why?

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Which of these is a reversible change? (a) milk turning into curd (b) burning of wax (c) melting of wax (d) rusting of iron

(c) melting of wax. The melted wax gets solidified after cooling. The melting of wax, therefore, is a reversible change.

Which of these is a reversible change?
(a) milk turning into curd
(b) burning of wax
(c) melting of wax
(d) rusting of iron

(c) melting of wax.
The melted wax gets solidified after cooling. The melting of wax, therefore, is a reversible change.