1
KCET 2025
MCQ (Single Correct Answer)
+1
-0

Given below are two statements.

Statement-I : Adiabatic work done is positive when work is done on the system and internal energy of the system increases.

Statement - II : No work is done during free expansion of an ideal gas.

In the light of the above statements, choose the correct answer from the options given below.

A
Both statements - I and Statement - II are false
B
Statement - I is true but statement - II is false
C
Statement - I is false but statement - II is true
D
Both statements - I and Statement - II are true.
2
KCET 2025
MCQ (Single Correct Answer)
+1
-0

Which one of the following reactions has $\Delta \mathrm{H}=\Delta \mathrm{U}$ ?

A
$\mathrm{CaCO}_3(\mathrm{~s}) \xrightarrow{\Delta} \mathrm{CaO}(\mathrm{s})+\mathrm{CO}_2(\mathrm{~g})$
B
$\mathrm{C}_6 \mathrm{H}_6(\mathrm{I})+\frac{15}{2} \mathrm{O}_2(\mathrm{~g}) \longrightarrow 6 \mathrm{CO}_2(\mathrm{~g})+3 \mathrm{H}_2 \mathrm{O}(\mathrm{I})$
C
$2 \mathrm{HI}(\mathrm{g}) \rightleftharpoons \mathrm{H}_2(\mathrm{~g})+\mathrm{I}_2(\mathrm{~g})$
D
$\mathrm{N}_2(\mathrm{~g})+3 \mathrm{H}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NH}_3(\mathrm{~g})$
3
KCET 2025
MCQ (Single Correct Answer)
+1
-0

Identify the incorrect statements among the following:

(a) All enthalpies of fusion are positive

(b) The magnitude of enthalpy change does not depend on the strength of the intermolecular interactions in the substance undergoing phase transformations.

(c) When a chemical reaction is reversed, the value of $\Delta \mathrm{rH}^{\circ}$ is reversed in sign.

(d) The change in enthalpy is dependent of path between initial state (reactants) and final state (products)

(e) For most of the ionic compounds, $\Delta_{\text {sol }} \mathrm{H}^{\circ}$ is negative

A
a, b and d
B
b, d and e
C
a, d and e
D
a and e only
4
KCET 2025
MCQ (Single Correct Answer)
+1
-0

Which of the following statements is/are true about equilibrium?

(a) Equilibrium is possible only in a closed system of at a given temperature

(b) All the measurable properties of the system remain constant at equilibrium

(c) Equilibrium constant for the reverse reaction is the inverse of the equilibrium constant for the reaction in the forward direction.

A
Only b
B
Only c
C
a, b and c
D
Only a
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