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

Two statements, one Assertion and the other Reason are given. Choose the right option.

Assertion: The Molar conductivity of KCl increases very slowly with dilution and approaches a limiting value when dilution is infinite.

Reason: In case of KCl there is an increase in the number of ions on dilution due to complete ionisation at infinite dilution.

A

Both Assertion and Reason are correct and Reason is the correct explanation of Assertion

B

Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion

C

Assertion is incorrect but Reason is correct

D

Assertion is correct but Reason is incorrect

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

The statements given below contains assertion and reason. Choose the correct option

Assertion (A): Cr, Mo and W possess the highest melting point in their respective series of elements.

Reason (R): Cr, Mo and W have stable half-filled electrons in the 'd' shell resulting in strong metallic bonding.

A

A is true but R is false

B

Both $A$ and $R$ are true, $R$ is the correct explanation of $A$

C

Both $A$ and $R$ are true but $R$ is not the correct explanation of $A$

D

A is false but R is true

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

$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ on heating with aqueous NaOH gives $\_\_\_\_$

A

$\mathrm{Cr}(\mathrm{OH})_2$

B

$\mathrm{Cr}(\mathrm{OH})_3$

C

$\mathrm{CrO}_4{ }^{2-}$

D

$\mathrm{CrO}_3$

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

In the photoelectric emission, the energy of the emitted electron is:

A

greater than the energy of the incident photon

B

smaller than the energy of the incident photon

C

same as that of the incident photon

D

proportional to the intensity of the incident photon