Which of the following will not produce $H_{2}$ gas?

M g + d i l . H N O_{3}

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N a + c o n c . H N O_{3}

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C a + d i l . H C l

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A l + d i l . H C l

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Solution

The correct option is B $N a + c o n c . H N O_{3}$
Generally metal reacts with dilute acids to produce metal salt and hydrogen gas.
con nitric acid is strong oxidising agent which oxidises $H_{2}$ produced to water.
But magnesium and manganese react with very dilute $H N O_{3}$ to evolve $H_{2}$ gas.

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