1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The concentration and percentage purity of Oxalic acid can be determined by titration with $\mathrm{KMnO}_4$ in presence of dil. $\mathrm{H}_2 \mathrm{SO}_4$. Instead of dil. $\mathrm{H}_2 \mathrm{SO}_4$, dil HCl cannot be used because
A
HCl can also reduce $\mathrm{MnO}_4^{-}$to $\mathrm{Mn}^{2+}$
B
HCl can also provide $\mathrm{H}^{+}$ions in addition to $\mathrm{H}^{+}$ions from Oxalic acid.
C
HCl can also oxidise Oxalic acid to $\mathrm{CO}_2$ and $\mathrm{H}_2 \mathrm{O}$.
D
Oxalic acid oxidises HCl to $\mathrm{Cl}_2$.
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

What is the final product $[\mathrm{Z}]$ formed when the given reactions take place?

COMEDK 2025 Morning Shift Chemistry - Alcohol, Phenols and Ethers Question 1 English

A
4-Bromonitrobenzene.
B
2-Bromonitrobenzene.
C
2, 4, 6-tribromonitrobenzene.
D
3-Bromonitrobenzene.
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A non-volatile solute A weighing 60 g when dissolved in 212 g of the solvent Xylene reduces its vapour pressure to $60 \%$. What is the Molar mass of A in $\mathrm{g} / \mathrm{mol}$ ? [MM of xylene $=106 \mathrm{~g} / \mathrm{mol}$ ]
A
56
B
126
C
60
D
45
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two statements, one Assertion (A) and the other Reason (R) are given. Choose the correct option.

Assertion: Compound $[\mathrm{X}]$ reacts with Hydrazine in presence of $\mathrm{KOH} /$ Glycol to form the product $[\mathrm{Y}]$.

COMEDK 2025 Morning Shift Chemistry - Aldehyde and Ketone Question 2 English

Reason: Reduction reaction occurs and Carbonyl group is reduced to Methylene group.

A
Both A and R are correct but R is not the correct explanation of A .
B
Both A and R are correct and R is the correct explanation of A .
C
A is wrong but R is correct.
D
A is correct but R is wrong.
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