JEE Main 202621 JanuaryMorning Shift
- Exam
- JEE Main
- Year
- 2026
- Date
- 21 January
- Shift
- Morning Shift
- Subject
- Chemistry
- Chapter
- Coordination Compounds
JEE Main 2026 · 21 January · Morning Shift · Chemistry · Coordination Compounds
Given below are two statements : Statement I : Among .[Cu(NH_ 3 )_...
Given below are two statements :
Statement I : Among \left.\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\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+}\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],\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 true but Statement II is false Both Statement I and Statement II are false
Statement I : Among \left.\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\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+}\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],\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 true but Statement II is false Both Statement I and Statement II are false
Options
- AStatement I is true but Statement II is false
- BBoth Statement I and Statement II are false
- CBoth Statement I and Statement II are true
- DStatement I is false but Statement II is true
Correct answer
A. Statement I is true but Statement II is false
Step-by-step solution
Statement I: Unpaired electrons in each complex:
: is → 1 unpaired
: is , octahedral → 2 unpaired
: is → 2 unpaired
: is , weak field → high spin → 5 unpaired
has maximum. Statement I is true.
Statement II: : (), tetrahedral → paramagnetic
: () → diamagnetic
: (), square planar → diamagnetic
Only pair has both diamagnetic. Count = 1, not 2. Statement II is false.
: is → 1 unpaired
: is , octahedral → 2 unpaired
: is → 2 unpaired
: is , weak field → high spin → 5 unpaired
has maximum. Statement I is true.
Statement II: : (), tetrahedral → paramagnetic
: () → diamagnetic
: (), square planar → diamagnetic
Only pair has both diamagnetic. Count = 1, not 2. Statement II is false.