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Clay and lime on strong heating produces a fused mass known as 'cement clinkers'

Melting point and boiling point of II A group elements are higher than that of corresponding I A group elements

Zeolite method is used to remove permanent hardness of water

' $Ba$ ' is soluble in both water and liquid ${NH}_{3}$

answer is A.

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Detailed Solution

The product of heating limestone (calcium carbonate) and clay is hydraulic mortar.
Group 2 metals have stronger metallic bonds, which leads to greater cohesive energies and compact atom packing. This explains why group 2 metals are harder and have higher melting and boiling temperatures than group 1 metals.
As the calcium and magnesium ions are removed from the water and sodium permutate is changed into calcium and magnesium permutate, hard water becomes soft as a result of the calcium and magnesium ions being trapped in zeolite.
Ba is a kind of metal that, like ammonia, may dissolve in water.

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