NEET Coordination Compounds — Set 4

Question 1

Which compound has the formula $ \ce{[Co(en)2Cl2]Cl} $?

Accepted Answer

The IUPAC name dichloridobis(ethane-1,2-diamine)cobalt(III) chloride indicates 2 $ \ce{Cl^-} $ and 2 en ligands in the coordination sphere, with 1 $ \ce{Cl^-} $ as a counter ion, matching $ \ce{[Co(en)2Cl2]Cl} $.

Question 2

What is the primary valence of Co in $ \ce{[Co(NH3)4Cl2]NO3} $?

Accepted Answer

Primary valence is the oxidation state. In $ \ce{[Co(NH3)4Cl2]NO3} $, $ \ce{[Co(NH3)4Cl2]^+} $ balances $ \ce{NO3^-} $. $ \ce{NH3} $ is neutral, 2 $ \ce{Cl^-} $ = -2, so Co is +3 (+3 - 2 = +1).

Question 3

The number of geometrical isomers for $ \ce{[Co(NH3)2Cl2(en)]^+} $ is:

Accepted Answer

This octahedral complex ($ \ce{[Ma2b2c2]} $) with 2 $ \ce{NH3} $, 2 $ \ce{Cl^-} $, and 1 en (bidentate) has 3 geometrical isomers due to different arrangements of $ \ce{NH3} $ and $ \ce{Cl^-} $.

NEET Chemistry: Coordination Compounds — Practice Set 4

Q1. Which compound has the formula \( \ce{[Co(en)2Cl2]Cl} \)?

Q2. What is the primary valence of Co in \( \ce{[Co(NH3)4Cl2]NO3} \)?

Q3. The number of geometrical isomers for \( \ce{[Co(NH3)2Cl2(en)]^+} \) is:

Q4. Which complex can show geometrical isomerism?

Q5. Which complex contains a ligand that donates four electrons to the metal ion?

Q6. What is the coordination number of iron in \( \ce{[Fe(en)2Cl2]^+} \)?

Q7. Which complex exhibits ionization isomerism with \( \ce{[Co(NH3)5Br]SO4} \)?

Q8. How many chloride ligands must be adjacent in the cis isomer of \( \ce{[Co(NH3)3Cl3]} \)?

Q9. Which complex absorbs light in the visible region due to a d-d transition?

Q10. How many unpaired electrons are present in \( \ce{[Mn(H2O)6]^2+} \)? (Mn atomic number = 25)