1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Identify $[\mathrm{X}]$, the final product formed when 2 moles of Ethanal undergoes the following series of reactions with reagents [(i) to (iv)]

COMEDK 2025 Morning Shift Chemistry - Aldehyde and Ketone Question 1 English

A
But-3-enoic acid
B
But-2-enoic acid
C
Propanoic acid
D
Ethanoic acid
2
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: Maltose, a disaccharide, is a reducing sugar and is obtained by the partial hydrolysis of starch in presence of the enzyme diastase.

Reason: Hydrolysis of one mole of Maltose gives one mole each of $\alpha-D-$ Glucose and $\beta-D-$ Fructose.

A
A is wrong but R is correct.
B
Both A and R are correct but R is not the correct explanation of A .
C
A is correct but R is wrong.
D
Both A and R are correct and R is the correct explanation of A .
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which one of the following options represents the decreasing order of oxidation number of the central atom in:

$$\mathrm{Cr}_2 \mathrm{O}_7^{2-}, \mathrm{Cr} \mathrm{O}_2^{-}, \mathrm{MnO}_4^{-}, \mathrm{BrO}_3^{-}$$

A
$\mathrm{CrO}_2^{-}>\mathrm{BrO}_3^{-}>\mathrm{Cr}_2 \mathrm{O}_7^{2-}>\mathrm{MnO}_4^{-}$
B
$\mathrm{MnO}_4^{-}>\mathrm{CrO}_2^{-}>\mathrm{Cr}_2 \mathrm{O}_7^{2-}>\mathrm{BrO}_3^{-}$
C
$\mathrm{BrO}_3^{-}>\mathrm{CrO}_2^{-}>\mathrm{MnO}_4^{-}>\mathrm{Cr}_2 \mathrm{O}_7^{2-}$
D
$\mathrm{MnO}_4^{-}>\mathrm{Cr}_2 \mathrm{O}_7^{2-}>\mathrm{BrO}_3^{-}>\mathrm{CrO}_2^{-}$
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

COMEDK 2025 Morning Shift Chemistry - d and f Block Elements Question 1 English

What is the spin only magnetic moment of the metal ion in $\mathbf{P}$ and the oxidation number of Sulphur in the oxidised product Z ?

A
$\mu=0 \quad$ Oxidation number $=+4$
B
$\mu=5.00 \mathrm{BM} \quad$ Oxidation number $=0$
C
$\mu=5.92 \mathrm{BM} \quad$ Oxidation number $=+2$
D
$\mu=1.732 \mathrm{BM} \quad$ Oxidation number $=+6$
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