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Standard XII

Chemistry

State and Path Variables, Functions

Assertion :Wo...

Question

Assertion :Work done during free expansion of an ideal gas whether reversible or irreversible is positive. Reason: During free expansion, external pressure is always less than the pressure of the system.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
During free expansion, external pressure is zero.
Therefore, work done = $P Δ V = 0$
Therefore, both the statements are incorrect.

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Similar questions

Q. Assertion
If BOD level of water in reservoir is less than 5 ppm it is not polluted.

Reason
High biological oxygen demand means low activity of bacteria in water.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

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Reason:

CaO

formed by decomposition of

{CaCO}_{3}

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{SiO}_{2}

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Assertion :Work done during free expansion of an ideal gas whether reversible or irreversible is positive. Reason: During free expansion, external pressure is always less than the pressure of the system.

The correct option is D Both Assertion and Reason are incorrectDuring free expansion, external pressure is zero.Therefore, work done = PΔV=0Therefore, both the statements are incorrect.

The correct option is D Both Assertion and Reason are incorrect
During free expansion, external pressure is zero.
Therefore, work done = $P Δ V = 0$
Therefore, both the statements are incorrect.