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Excess of calcium orthophosphate is reac...

Excess of calcium orthophosphate is reacted with magnesium to form calcium phosphide `(Ca_(3)P_(2))` along with magnesium oxide. Calcium phosphide on reacting with excess of water liberate phosphine gas `(PH_(3))` along with calcium hydroxide. Phosphine is burnt in excess of oxygen to form `P_(2)O_(5)` along with water. Oxides of magnesium and phosphorous react to give magnesium metaphophate. Calculate grams of magnesium metaphosphate obtained if 1.92 gm of magnesium is taken.
[Round off your answer to nearest integer]

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