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Which among the given is present in hard water?
Which among the given is responsible for permanent hardness of water -
Which among the given is responsible for the extra strength of pyrex glass
Which among the given is the 2nd largest source of global energy -
Which among the given is the best source of Iodine -
Which among the given is the hardest element?
Which among the given is the petroleum wax
Which among the given is used as a lubricant in heavy machines
Which among the given is used as anesthetic -
Which among the given is used for refrigeration