A one litre flask contains some mercury. It is found that at different temperature the volume of...

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A one litre flask contains some mercury. It is found that at different temperature the volume of air inside the flask remains the same. What is the volume of mercury in the flask? Given the coefficient of linear expansion of glass \( =9 \times 10^{-6}{ }^{\circ} \mathrm{C}^{-1} \) :
(A) \( 50 \mathrm{~cm}^{3} \)
(B) \( 100 \mathrm{~cm}^{3} \)
(C) \( 150 \mathrm{~cm}^{3} \)
(D) \( 200 \mathrm{~cm}^{3} \)
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