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why magnetising a piece of iron is a physical change?

Because no chemical reactions takes place and the iron will not hold the magnetic power for a long time.

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becoz this is a temporary change and in this change no new substance is formed . iron will lose its magnetic power when it is demagnetised 

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because when we heat or drop the magnetised piece of iron, it loses its magnetic power

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The weight of iron bar before and after passage of current remains same and no energy change occurs.so,it is a physical change.

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Bcz iron get seprated by the magnet and also no new substance is formed
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Because in heating iron it changes into ash and not come back into its physical state in cooling. Therefore it is a chemical change
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as a desiccant to control local humidity to avoid spoilage or degradation of some goods.
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Magnetizing a piece of iron is a physical change as in cource of time the iron may loose it's magnetic properties and get demagnetized.
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Because in a chemical change a completely new substance is formed with different properties but here iron just magnetised. So it is a physical change.
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Please find this answer

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It is a physical change because the piece of iron can be demagnetized by simple physical methods.
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MAGNETISING OF A PIECE OF IRON IS A PHYSICAL CHANGE BCOZ IT CAN BE REVERSED BACK.
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