U Grills of doors and windows are always painted before they are used.
2) Tungsten metal is used to make a solenoid type coil in an electric bulb.
53 Elements belonging to the same group have the same valency
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Solution : (1) Grills of doors and windows are made from iron. ... (2) Paint does not allow air or moisture to come in contact with iron surface. Therefore, to prevent rusting of iron, grills of doors and windows are always painted before they are used
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