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Q. Permanent hardness of water is due to the presence of ?
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Q. Sodium carbonate crystal lose water molecules this property is called
Q. Salts of which among the given elements provide colours to fireworks?
Q. A traditional 'battery' contains which of the following chemicals?
Q. Choose the incorrect pair from the below.
Q. The chemical used in developing photographic films is
Q. The commercially useful property of both ethylene and styrene is their ability
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