1
COMEDK 2026 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

Identify the correct statement.

A

The " D " in $\mathrm{D}(+)$-glucose represents the dextrorotatory nature of Glucose and ( + ) stands for its configuration

B

During denaturation of Proteins its 3- dimensional structure is destroyed because the primary, secondary and tertiary structures get destroyed due to rise in temperature

C

Except Glycine and Tryptophan all the other naturally occurring Amino acids are optically active

D

Glucose gets oxidised to Gluconic acid with $\mathrm{Br}_2(\mathrm{aq})$ which indicates that the carbonyl group in it is an Aldehydic group

2
COMEDK 2026 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

$x$ moles of $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ oxidises 1 mole of ferrous oxalate, in acidic medium. Hence ' $x$ ' is:

A

2

B

1.5

C

1.0

D

0.5

3
COMEDK 2026 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

In the synthesis of $\mathrm{NH}_3$ from $\mathrm{H}_2$ and $\mathrm{N}_2$, if $6 \times 10^{-2}$ mole of hydrogen disappears in 10 minutes, the number of moles of $\mathrm{NH}_3$ formed in 0.3 minutes is:

A

$4.0 \times 10^{-3}$ moles

B

$6.0 \times 10^{-3}$ moles

C

$1.2 \times 10^{-3}$ moles

D

$1.5 \times 10^{-3}$ moles

4
COMEDK 2026 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

The element with the highest third ionisation enthalpy is:

A

Vanadium( $\mathrm{Z}=23$ )

B

Manganese ( $\mathrm{Z}=25$ )

C

Iron ( $\mathrm{Z}=26$ )

D

Chromium ( $\mathrm{Z}=24$ )