'Anhydrone' is a very effective desiccant (water absorber) used in 'dry batteries'. It is :

c o n c . H_{2} S O_{4}

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P_{2} O_{5}

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C a C l_{2}

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M g (C l O_{4})_{2}

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Solution

The correct option is D $M g (C l O_{4})_{2}$
Magnesium perchlorate decomposes at 250 °C. The heat of formation is -568.90 kJ mol⁻¹. The enthalpy of solution is quite high, so reactions are done in large amounts of water to dilute it. It is sold under the trade name Anhydrone.

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