1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
What volume of $0.2 \mathrm{M} \mathrm{CH}_3 \mathrm{COOH}$ needs to be added to 100 ml of $0.4 \mathrm{M} \mathrm{CH}_3 \mathrm{COONa}$ solution to prepare a buffer of pH equal to 4.91 ? ( $\mathrm{pK}_{\mathrm{a}}$ of $\mathrm{CH}_3 \mathrm{COOH}$ is 4.76 )
A
282.6 ml
B
213.65 ml
C
101.41 ml
D
141.54 ml
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Identify the final product $[Z]$ formed when Chlorobenzene undergoes the given series of reactions:

COMEDK 2025 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 1 English

A
COMEDK 2025 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 1 English Option 1
B
COMEDK 2025 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 1 English Option 2
C
COMEDK 2025 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 1 English Option 3
D
COMEDK 2025 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 1 English Option 4
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Two volatile liquids X and Y form an ideal solution at 298 K and have vapour pressures equal to 100 mm and 200 mm of Hg respectively in their pure state. The mole fraction of X in the solution is 0.4 and the mole fraction of Y in the vapour phase is $a / 20$. Calculate the value of a.
A
25
B
15
C
10
D
5
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
0.4 g of Propane burns completely at 300 K in a bomb calorimeter. The temperature of the calorimeter and surrounding water rises by $0.4^0 \mathrm{C}$. If the heat capacity of the calorimeter and contents is $24 \mathrm{~kJ} \mathrm{~K}^{-1}$ what is the Enthalpy for the reaction? (Assume that propane gas shows ideal behaviour).
A
$-$1006.9 kJ
B
$-$1063.5 kJ
C
$-$2084.6 kJ
D
$-$1902.8 kJ
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