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Select the correct observation for a \( 8.21 \) lit container,
\( \mathrm{P} \) filled with 2 moles of He at \( 300 \mathrm{~K} \).,

W.
(A) It has pressure \( 6 \mathrm{~atm} \)
(B) If it is an open rigid container, its pressure increases to \( 8 \mathrm{~atm} \) on heating to \( 400 \mathrm{~K} \).
(C) If it is closed non-rigid (like thin skin balloon), its volume increases to \( 16.42 \) lit. on heating to \( 600 \mathrm{~K} \)
(D) When connected with another similar empty container maintained at \( 150 \mathrm{~K} \) while maintaining original container at \( 300 \mathrm{~K} \), pressure reduces to \( \frac{2}{3} \mathrm{~atm} \).
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