IIT-JEE 2009 · Paper 2 · Chemistry Q2

ChemistrySingle correct+3 / -1Question 2 of 57

The spin only magnetic moment value (in Bohr magneton units) of $\ce{Cr(CO)6}$ is

2.84

4.90

5.92

Answer and worked solution

Official answer: A

Cr(0), d⁶. CO is a strong-field ligand, so the six electrons pair up in the $t_{2g}$ set ( $t_{2g}^6e_g^0$ ): no unpaired electrons, $\mu=0$ .

(A)

IIT-JEE 2009 · Paper 2, Chemistry question 2