A For the reaction- 2NH3g- N2g - 3H2g - H - - U- R The enthalpy change is always greater than internal energy change-

The correct option is B Assertion (A) is true but reason (R) is false 2N H _ 3 ( g ) → N _ 2 ( g ) +3 H _ 2 ( g ) H=μ + nRT n=4 2=2 H=μ +2R ...

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Standard XII

Chemistry

Third Law of Thermodynamics

A For the rea...

Question

(A) For the reaction,
$2 N H_{3} (g) \to N_{2} (g) + 3 H_{2} (g)$
$Δ H > Δ U$ .
(R) The enthalpy change is always greater than internal energy change.

Both (R) and (A) are true and reason is the. correct explanation of assertion

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Both (R) and (A) are true but reason is not correct explanation of assertion

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Assertion (A) is true but reason (R) is false

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Assertion (A) and reason (R) both are false

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Assertion (A) is false but reason (R) is true

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Solution

The correct option is B Assertion (A) is true but reason (R) is false
$2 N H_{3} (g) \to N_{2} (g) + 3 H_{2} (g) △ H = △ μ + △ n R T △ n = 4 - 2 = 2 △ H = △ μ + 2 R T △ H > △ μ$
So, Assertion A is True.
In some case, enthalpy may be less than internal energy change (when $△ n$ is negative) so reason is False.

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Similar questions

(a) Both Assertion (A) and Reason (R) are true and Reason (A) and Reason (R). For selecting the correct answer, use the following code :

(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not a correct explanation of Assertion (A).

(d) Assertion (A) is false and Reason (R) is true.

$\begin{matrix} Assertion (A) & Reason (R) \sqrt{3} i s a n i r r a t i o n a l n u m b e r . & T h e s u m o f a r a t i o n a l n u m b e r a n d a n i r r a t i o n a l n u m b e r i s a n i r r a t i o n a l n u m b e r . \end{matrix} The correct answer is: (a)/(b)/(c)/(d).$

This question consists of two statements, namely, Assertion (A) and Reason (R). For selecting the correct answer, use the following code:

(a) Both Assertion (A) and Reason (R) are true and Reason (R) correct explanation of Assertion (A).

(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not a correct explanation of Assertion (A).

(d) Assertion (A) is false and Reason (R) is true.

Q. Assertion (A)

\sqrt{8}

is an irrational number.
Reason (R)
If m is a natural number which is not a perfect square, then

\sqrt{m}

is irrational.

(a) Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not correct explanation of Assertion (A).
(c) Assertion (A) is true and Reason (R) is false.
(d) Assertion (A) is false and Reason (R) is true.

Q. Assertion(A): Some algae are unicellular.
Reason(R): They belong to the kingdom Monera.

This question consists of two statements,namely,Assertion (A) and Reason (R).For selecting the correct answer,use the following code:

(a) Both Assertion (A) and Reason (R) are true and Reason (R) correct explanation of Assertion (A).

(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not a correct explanation of Assertion (A).

(d) Assertion (A) is false and Reason (R) is true.

$\begin{matrix} A s s e r t i o n (A) & R e a s o n (R) If ABCD is a rhombus whose one & Median of a triangle divides it angle is 60^{\circ} then the ratio of the & into two triangles of equal area. lenghts of its diagonals is \sqrt{3} : 1. \end{matrix}$

The correct answer is :(a) /(b)/(c)/(d).

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(A) For the reaction, 2NH3(g)→N2(g)+3H2(g)ΔH>ΔU. (R) The enthalpy change is always greater than internal energy change.

The correct option is B Assertion (A) is true but reason (R) is false2NH3(g)→N2(g)+3H2(g)△H=△μ+△nRT△n=4−2=2△H=△μ+2RT△H>△μSo, Assertion A is True.In some case, enthalpy may be less than internal energy change (when △n is negative) so reason is False.

(A) For the reaction,
$2 N H_{3} (g) \to N_{2} (g) + 3 H_{2} (g)$
$Δ H > Δ U$ .
(R) The enthalpy change is always greater than internal energy change.