1
JEE Main 2023 (Online) 11th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : $$\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}$$ absorbs at lower wavelength of light with respect to $$\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5}\left(\mathrm{H}_{2} \mathrm{O}\right)\right]^{3+}$$

Reason R : It is because the wavelength of the light absorbed depends on the oxidation state of the metal ion.

In the light of the above statements, choose the correct answer from the options given below:

A
$$\mathrm{A}$$ is false but $$\mathrm{R}$$ is true
B
Both $$\mathrm{A}$$ and $$\mathrm{R}$$ are true but $$\mathrm{R}$$ is NOT the correct explanation of $$A$$
C
Both $$\mathrm{A}$$ and $$\mathrm{R}$$ are true and $$\mathrm{R}$$ is the correct explanation of $$\mathrm{A}$$
D
$$\mathrm{A}$$ is true but $$\mathrm{R}$$ is false
2
JEE Main 2023 (Online) 11th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

If $$\mathrm{Ni}^{2+}$$ is replaced by $$\mathrm{Pt}^{2+}$$ in the complex $$\left[\mathrm{NiCl}_{2} \mathrm{Br}_{2}\right]^{2-}$$, which of the following properties are expected to get changed ?

A. Geometry

B. Geometrical isomerism

C. Optical isomerism

D. Magnetic properties

A
A and D
B
A, B and D
C
A, B and C
D
B and C
3
JEE Main 2023 (Online) 11th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List I with List II

LIST I
Complex
LIST II
Colour
A. $$Mg(N{H_4})P{O_4}$$ I. brown
B. $${K_3}[Co{(N{O_2})_6}]$$ II. white
C. $$MnO{(OH)_2}$$ III. yellow
D. $$F{e_4}{[Fe{(CN)_6}]_3}$$ IV. blue

Choose the correct answer from the options given below :

A
A-II, B-IV, C-I, D-III
B
A-II, B-III, C-I, D-IV
C
A-III, B-IV, C-II, D-I
D
A-II, B-III, C-IV, D-I
4
JEE Main 2023 (Online) 11th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The magnetic moment is measured in Bohr Magneton (BM).

Spin only magnetic moment of $$\mathrm{Fe}$$ in $$\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$$ and $$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$$ complexes respectively is :

A
3.87 B.M. and 1.732 B.M.
B
5.92 B.M. and 1.732 B.M.
C
6.92 B.M. in both
D
4.89 B.M. and 6.92 B.M.
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