The measuring unit of density is, Equal masses of different substances have different, All the solutions conduct electricity except, One of the elements which don’t react with oxygen of air is, The density of mercury is 13 g/cm3., The melting point of iron is 1538 °C, The boiling point of water is 100 °C, It is preferable to use iron with concrete in building than copper, Water cannot put out Petrol fire., Balloons filled with Helium and Hydrogen rise up in the air..

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