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Metals have luster (shine). Give reason why some metal articles become dull and lose their shine.
Why is a tumbler not made with a piece of cloth?
What are the similarities between iron, copper and aluminium?
What is the reason for grouping materials?
Grouping of objects helps the shopkeeper.' Justify the statement.
Suggest two bases on which we can group objects.
Why is water important for our body?
Write any four properties of materials.