Study the changes given in the box.

Identify the chemical changes.

Only (i) and (ii)

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Only (ii) and (iii)

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Only (i) and (iii)

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(i), (ii) and (iii)

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Solution

The correct option is A Only (i) and (ii)
Chemical changes involve the formation of a new compound from the reactants. As, magnetization of iron doesn’t involve formation of a new compound, so it is not a chemical change. It just changes the alignment of magnetic domains inside the compound. In other two cases new compounds are formed, so they are chemical changes.

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Similar questions

Identify the chemical changes in the list:

(i) Ripening of fruits

(ii) Fermentation of grapes

(iii) Magnetization of iron

Q. Which of the following are chemical changes ?
(i) decaying of wood
(ii) burning of wood
(iii) sawing of wood
(iv) hammering of nail into wood

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

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Q. Question 7
Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

Question 10
New species may be formed if

(i) DNA undergoes significant changes in germ cells.
(ii) Chromosome number changes in the gamete.
(iii) There is no change in the genetic material.
(iv) Mating does not take place.

(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii), (iii) and (iv)
(d) (i), (ii) and (iii)

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Study the changes given in the box. Identify the chemical changes.

Study the changes given in the box.

Identify the chemical changes.