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12 g of an alkaline earth metal gives 14.8 g of its nitride. Atomic weight of the metal is

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12 g of an alkaline earth metal gives 14.8 g of its nitride. Atomic weight of the metal is

(a) 12

(b) 20

(c) 40

(d) 14.8

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1 Answer

+3 votes
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Best answer

Correct option  (c) 40

Explanation:

Let the alkaline earth metal be A

by (10 points)
+1
Why 3A is written
by (1.5k points)
We know The nitrides of the alkaline earth metals have the formula M3N2.
Where M is alkaline earth metal and N is Nitrogen.
So, to balance the equation we take 3A.
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