Question

Which of the following statements is/are correct for the coordination compound $K_2\left[Cr\right(N{H}_3\left)\right(CN{)}_4\left(NO\right)]?$ (spin only magnetic moment for the compound is $1.732BM$

• A. Its IUPAC name is potassium amminetetracyanidonitrosylchromate(II)
• B. It is a coloured compound
• C. It is an inner orbital complex that has $d^{2}s{p}^3$ hybridization
  
• D. It exists as two cis-trans type geometrical isomers

Answer 1

Answer: (B), (C), (D)

The correct options are
B It is a coloured compound
C It is an inner orbital complex that has $d^{2}s{p}^3$ hybridization

D It exists as two cis-trans type geometrical isomers

a) The IUPAC name of the complex is potassium amminetetracyanidonitrosyliumchromate(I)
b) In the complex, $Cr$ exists in +1 oxidation state. So the corresponding electronic configuration will be: $t_{2g}^5{e}_g^0$. So, electronic excitation is possible and hence, it is a colored compound.
c) Since electrons are getting paired up, it will be an inner orbital complex and the hybridisation will be $d^{2}s{p}^3$.
d) It is a $M{a}_{4}bc$ type of compound, so we can have two cis-trans type of geometrical isomers.