$_{7} X^{15}$ and $_{8} Y^{15}$ differ in

Physical properties

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Chemical properties

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Number of neutrons

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Number of nucleons

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Solution

The correct option is D Number of neutrons
The option (C) is the correct answer.
$_{7} X^{15}$ and $_{8} Y^{15}$ differ in number of neutrons.
Number of neutrons for $_{7} X^{15} = 15 - 7 = 8$
Number of neutrons for $_{8} Y^{15} = 15 * 8 = 7$
Note: Number of neutrons $=$ mass number $-$ atomic number.

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A

\frac{x}{6} + \frac{y}{15} = 4, \frac{x}{3} - \frac{y}{12} = \frac{19}{4} .

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