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  4. 2.4 g of pure Mg (at. mass = 24) is dropped in 100 mL of 1 M HCl. Which of the following statement is wrong?

Q. 2.4 g of pure Mg (at. mass = 24) is dropped in 100 mL of 1 M HCl. Which of the following statement is wrong?

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Solution:

$\underset{\begin{matrix}2.4g \\ 0.1mol \\ -0.05 \\ 0.05mol\end{matrix}}{M g} & + & \underset{\begin{matrix}\left(\right.1M,100ml\left.\right) \\ 0.1mol\end{matrix}}{2 H C l} & \rightarrow & MgCl_{2} & + & H_{2}$
HCl is a limiting reagent
0.1 mol HCl give $\frac{0.1}{2}$ mol $H_{2}$ or 1.12 lit $H_{2}$ at STP
0.05 mol Mg left
So option D is wrong.

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