Which one of the following metals is used in the filaments of photo-el – InterviewSolution

1.	Which one of the following metals is used in the filaments of photo-electric cells that convert light into electric energy ?
Answer» Tungsten Copper Rubidium Aluminium Solution :The PERMANENT hardness of water is due to PRESENCE of chloride and SULPHATES salts of calcium and magnesium . This type of hardness of can be removed by Calgon's method , Ion-exchange method and treatment with washing soda . Boiling can REMOVE only the temporary hardness of water but not permanent hardness.

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