Question

Q1 ) Choose the correct option and fill in the blanks.
[ physical, chemical, reversible, irreversible, evaporation, crystallisation ]
(i) Melting of wax is a ______ change.
(ii) Rusting of iron is an _______ change.
(iii) In a _______ change, no new substance is formed.
(iv) Shredding of paper is a/an ________ change.
(v) Burning of paper is a _______ change.
(vi) Common salt is recovered from seawater by ________ followed by ________.


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Answer 1

Answer:

i) Melting of wax is a physical change as chemical composition of substance is not changed.

ii) Rusting of iron is an irreversible change as chemical composition of substance is changed.

iii) In a physical change, no new substance is formed.

iv) Shredding of paper is an irreversible change.

v) Burning of paper is a chemical change as chemical compositon of paper is changed.

vi) Common salt is recovered from seawater by crystallization followed by evaporation.

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