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1
MHT CET 2025 19th April Evening Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following reactions exhibits decrease in entropy?

A

$2 \mathrm{H}_2 \mathrm{O}_{2(l)} \longrightarrow 2 \mathrm{H}_2 \mathrm{O}_{(l)}+\mathrm{O}_{2(\mathrm{~g})}$

B

$\mathrm{H}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{H}_{(\mathrm{g})}$

C

$\mathrm{CaCO}_{3(\mathrm{~s})} \xrightarrow{\Delta} \mathrm{CaO}_{(\mathrm{s})}+\mathrm{CO}_{2(\mathrm{~g})}$

D

$2 \mathrm{H}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{H}_2 \mathrm{O}_{(\mathrm{l})}$

2
MHT CET 2025 19th April Morning Shift
MCQ (Single Correct Answer)
+1
-0
Calculate $\Delta \mathrm{S}_{\text {total }}$ for a certain reaction at 298 K if $\Delta \mathrm{H}^{\circ}=-208.6 \mathrm{~kJ}$ and $\Delta \mathrm{S}^{\circ}=-36 \mathrm{~J} \mathrm{~K}^{-1}$
A
$664 \mathrm{~J} \mathrm{~K}^{-1}$
B
$834 \mathrm{~J} \mathrm{~K}^{-1}$
C
$926 \mathrm{~J} \mathrm{~K}^{-1}$
D
$736 \mathrm{~J} \mathrm{~K}^{-1}$
3
MHT CET 2025 19th April Morning Shift
MCQ (Single Correct Answer)
+1
-0
Calculate the change in internal energy of the system if 20 kJ of work is done on the system and it releases 10 kJ of heat in a particular reaction.
A
30 kJ
B
10 kJ
C
$-$15 kJ
D
$-$ 20 kJ
4
MHT CET 2025 19th April Morning Shift
MCQ (Single Correct Answer)
+1
-0
Which from following reactions performs zero work?
A
$\mathrm{CH}_{4(\mathrm{~g})}+\mathrm{Cl}_{2(\mathrm{~g})} \longrightarrow \mathrm{CH}_3 \mathrm{Cl}_{(\mathrm{g})}+\mathrm{HCl}_{(\mathrm{g})}$
B
$3 \mathrm{H}_{2(\mathrm{~g})}+\mathrm{N}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{NH}_{3(\mathrm{~g})}$
C
$\mathrm{C}_2 \mathrm{H}_{2(\mathrm{~g})}+\frac{5}{2} \mathrm{O}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_2 \mathrm{O}_{(l)}$
D
$2 \mathrm{C}_2 \mathrm{H}_{6(\mathrm{~g})}+7 \mathrm{O}_{2(\mathrm{~g})} \longrightarrow 4 \mathrm{CO}_{2(\mathrm{~g})}+6 \mathrm{H}_2 \mathrm{O}_{(\mathrm{l})}$
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