If $C a O$ caustic soda then which of the following option is correct?

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

: Refractory metal

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C a H_{2}

:Radioactive element

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Radium: Do not impart any colour

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M g O

: Constituent of sorel cement

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Solution

The correct option is A $M g O$ : Constituent of sorel cement
Option $(D)$ is correct.
$M g O$ is constituent of sorel cement.It is also known as magnesia cement.The cement is a mixture of magnesium oxide (burnt magnesia) with magnesium chloride.

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