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Action of Water on Calcium Carbide

8. 24 gm pure...

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8. 24 gm pure sample of magnesium is burned in air to form magnesium oxide and magnesium nitride. When products are treated with excess of H2O, 3.4 gm of gaseous NH3 is generated according to given reactions. Mg + O2 → MgO Mg + N2 → Mg3N2 Mg3N2 + 6H2O → 3Mg(OH)2 + 2NH3 Calculate the amount of magnesium oxide (in gm) in products

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Q. Assertion :Magnesium metal burns in air to give a white ash.When this ash is treated with water, the odour of ammonia can be detected. Reason: Mg burns in air to form MgO and

M g_{3} N_{2}

M g_{3} N_{2}

which on hydrolysis gives

N H_{3}

.

2 M g + O_{2} \to 2 M g O

3 M g + N_{2} \to M g_{3} N_{2}

M g_{3} N_{2} + 6 H_{2} O \to 3 M g (O H)_{2} + 2 N H_{3} ↑

Q. In an experiment 0.2430 gm of magnesium on burning with oxygen yielded 0.4030 gm of magnesium oxide. In another experiment 0.1820 gm of magnesium on burning with oxygen yielded 0.3020 gm of magnesium oxide. Show that the data explain the law of definite proportions.

What will be the product of magnesium nitride $M g_{3} N_{2}$ with warm water?

What is the product formed when magnesium nitride, $M g_{3} N_{2}$ reacts with warm water?

Q. 40 gm of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 16 gm magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample.

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