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

Which one of the following species will impart colour to an aqueous solution?

A

$\mathrm{Cr}^{3+}$

B

$\mathrm{Zn}^{2+}$

C

$\mathrm{Ti}^{4+}$

D

$\mathrm{Cu}^{+}$

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

The ion that has a spin only magnetic moment of 5.9 BM is:

A

$\mathrm{Fe}^{3+}$

B

$\mathrm{Mn}^{3+}$

C

$\mathrm{Ni}^{2+}$

D

$\mathrm{Co}^{3+}$

3
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

4
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

$\mathrm{CrO}_3$

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