Given below are two statements: Statement I: Among [ Cu( NH_3)^2+,[ Ni( en)_3)]^2+, [ Ni( NH_3)_6]^2+ and [ Mn( H_2 O)_6]^2+,[ Mn( H_2 O)_6]^2+, has the maximum number of unpaired electrons. Statement II: The number of pairs among \[ NiCl_4]^2-,[ Ni( CO)_4]\,\[ NiCl_4]^2-,[ Ni( CN)_4]^2-. and \[ Ni( CO)_4], [ Ni( CN)_4]^2-\ that contain only diamagnetic species is two. In the light of the above statements, choose the correct answer from the options given below:

[ Cu( NH_3)_4]^2+ => d^9, dsp^2 one unpaired electron \ [ Ni( en)_3]^2+ => d^8, sp^3 d^2 two unpaired electrons \ [ Ni( NH_3)_6]^2+ \ => d^8, sp^3 d^2 two unpaired electrons \ [ Mn( H_2 O)_6]^2+ \ => d^5, sp^3 d^2 five unpaired electrons \ [ Ni( CO)_4] (diamagnetic) \ [ NiCl_4]^-2 (paramagnetic) [ Ni( CN)_4]^-2 (diamagnetic)

Given below are two statements Statement I Among Cu NH ... | null (Chemistry)

JEE Mains 2026 21st January Shift 1

Chemistry

Given below are two statements:

\\

Statement I: Among

\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)^{2+},\left[\mathrm{Ni}(\mathrm{en})_{3}\right)\right]^{2+}

\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}

and

\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+},\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}

, has the maximum number of unpaired electrons.

\\

Statement II: The number of pairs among

\left\{\left[\mathrm{NiCl}_{4}\right]^{2-},\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]\right\},\left\{\left[\mathrm{NiCl}_{4}\right]^{2-},\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\right.

and

\left\{\left[\mathrm{Ni}(\mathrm{CO})_{4}\right], \quad\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\right\}

that contain only diamagnetic species is two.

\\

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

Statement I is false but Statement II is true

Both Statement I and Statement II are true

Both Statement I and Statement II are false

Statement I is true but Statement II is false

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Explanation

\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \Rightarrow \mathrm{d}^{9}, \mathrm{dsp}^{2}

one unpaired electron

\\ \left[\mathrm{Ni}(\mathrm{en})_{3}\right]^{2+} \Rightarrow \mathrm{d}^{8}, \mathrm{sp}^{3} \mathrm{~d}^{2}

two unpaired electrons

\\ \left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+} \\ \Rightarrow \mathrm{d}^{8}, \mathrm{sp}^{3} \mathrm{~d}^{2}

two unpaired electrons

\\ \left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \\ \Rightarrow \mathrm{d}^{5}, \mathrm{sp}^{3} \mathrm{~d}^{2}

five unpaired electrons

\\ \left[\mathrm{Ni}(\mathrm{CO})_{4}\right]

(diamagnetic)

\\ \left[\mathrm{NiCl}_{4}\right]^{-2}

(paramagnetic)

\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{-2}

(diamagnetic)

Select an option to instantly check whether it is correct or wrong.

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