How many grams of silver will be displaced from a solution of ${A g N O}_{3}$ by 4g of magnesium?

18 g

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4 g

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36 g

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16 g

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Solution

The correct option is D $36 g$
The reaction taking place can be represented as:

$M g + 2 A g N O_{3} \to M g (N O_{3})_{2} + 2 A g$

According to the reaction, $24 g$ magnesium will displace $2 \times 108 = 216 g$ silver

Hence, $4 g$ magnesium will displace $\frac{216}{24} \times 4 = 36 g$ silver

Hence, option $C$ is the correct answer

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