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-Only iiBoth i and iiOnly iNeither i nor ii

Question

Toppr Admin · Accepted Answer

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-

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?
Only ii
Both i and ii
Only i
Neither i nor 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.

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?Only iiBoth i and iiOnly iNeither i nor 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.

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?
Only ii
Both i and ii
Only i
Neither i nor 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.