199
Question
Two changes are stated below:
(i.) A piece of magnesium gives of bright flames when burned.
(ii). A piece of iron glows red when heated strongly.
Which of these is a physical change?
Two changes are stated below:
(i.) A piece of magnesium gives of bright flames when burned.
(ii). A piece of iron glows red when heated strongly.
Which of these is a physical change?
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Solution
The correct option is A Only ii
When magnesium is burnt, it reacts with oxygen and gives bright flames. This is a chemical change and cannot be reversed.
When iron is heated strongly, it turns red. When heating is stopped, it cools and gets backs to its original form. So this is a physical change. Hence option B is correct.
When magnesium is burnt, it reacts with oxygen and gives bright flames. This is a chemical change and cannot be reversed.
When iron is heated strongly, it turns red. When heating is stopped, it cools and gets backs to its original form. So this is a physical change. Hence option B is correct.
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