The powder of zinc phosphate cement contain zinc oxide and:

magnesium sulphate

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magnesium phosphate

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magnesium oxalate

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magnesium oxide

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Solution

The correct option is D magnesium oxide
Option $(D)$ is correct.
The powder of zinc phosphate cement contains zinc oxide and magnesium oxide. It is used for dentistry, cementation of inlays, crowns, bridges etc.

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\begin{matrix} M e t a l & Z i n c & M a g n e s i u m & C o p p e r Z i n c o x i d e & - & - & - M a g n e s i u m o x i d e & - & - & - C o p p e r o x i d e & - & - & - \end{matrix}

Describe giving all practical details, how would you prepare :

(a) copper sulphate crystals from a mixture of charcoal and black copper oxide,

(b) zinc sulphate crystals from zinc dust (powdered zinc and zinc oxide),

(d) Calcium sulphate from calcium carbonate.

Metallic oxides of zinc, magnesium and copper were heated with the following metals.

In which cases will you find displacement reactions taking place?

Zinc + _______ $\to$ Zinc oxide.

Zinc + _______ $\to$ Zinc oxide + Hydrogen.

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