An ideal gas in thermally insulated vessel at internal pressure = `p_1`, volume = `V_1` and absolute temperature = `T_1`

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Q 1177080886.     An ideal gas in thermally insulated vessel at internal pressure = `p_1`, volume = `V_1` and absolute temperature = `T_1` expands irreversibly against zero external pressure, as shown in the diagram.
The final internal pressure, volume and absolute temperature of the gas are `p_2, V_2` and `T_2`, respectively. Which of the following is true for this expansion?

(This question may have multiple correct answers)

A `q = 0`
B `p_2V_2 = p_1V_1`
C `p_2V_2^γ=p_1V_1^γ`
D `T_2 = T_1`

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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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