Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
None of these
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Cell membrane is
The metallic constituents of hard water are
One fathom is equal to
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Polythene is industrially prepared by the polymerisation of
Apparatus invented by Archimedes is :
The intencity of Earthquakes is measured on
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Permanent hardness of water can be removed by adding
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The metal used in storage batteries
The metal that is present in Photo Films is
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