JEE Main 2023 (Online) 8th April Morning Shift | Coordination Compounds Question 70 | Chemistry

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JEE Main 2023 (Online) 8th April Morning Shift

MCQ (Single Correct Answer)

-1

Which of the following complex is octahedral, diamagnetic and the most stable?

$$\mathrm{Na}_{3}\left[\mathrm{CoCl}_{6}\right]$$

$$\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{2}$$

$$\mathrm{K}_{3}\left[\mathrm{Co}(\mathrm{CN})_{6}\right]$$

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

JEE Main 2023 (Online) 8th April Morning Shift

MCQ (Single Correct Answer)

-1

The correct order of spin only magnetic moments for the following complex ions is

$$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}<\left[\mathrm{CoF}_{6}\right]^{3-}<\left[\mathrm{MnBr}_{4}\right]^{2-}<\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{3-}$$

$$\left[\mathrm{MnBr}_{4}\right]^{2-}<\left[\mathrm{CoF}_{6}\right]^{3-}<\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}<\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{3-}$$

$$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}<\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{3-}<\left[\mathrm{CoF}_{6}\right]^{3-}<\left[\mathrm{MnBr}_{4}\right]^{2-}$$

$$\left[\mathrm{CoF}_{6}\right]^{3-}<\left[\mathrm{MnBr}_{4}\right]^{2-}<\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}<\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{3-}$$

JEE Main 2023 (Online) 6th April Evening Shift

MCQ (Single Correct Answer)

-1

The IUPAC name of $$\mathrm{K}_{3}\left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]$$ is:-

Potassium tris(oxalato)cobalt(III)

Potassium tris(oxalato)cobaltate(III)

Potassium trioxalatocobaltate(III)

Potassium trioxalatocobalt(III)

JEE Main 2023 (Online) 6th April Morning Shift

MCQ (Single Correct Answer)

-1

Given below are two statements, one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$.

Assertion A: The spin only magnetic moment value for $$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$$ is $$1.74 \mathrm{BM}$$, whereas for $$\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$$ is $$5.92 \mathrm{BM}$$.

Reason $$\mathbf{R}$$ : In both complexes, $$\mathrm{Fe}$$ is present in +3 oxidation state.

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

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

A is true but R is false

A is false but R is true

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

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