Download App

Coordination Compounds — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds3 Marks
Question
Explain the following cases giving appropriate reasons:
  1. Nickel does not form low spin octahedral complexes.
  2. The $\pi-$ complexes are known for the transition metals only.
  3. $Co^{2+}$ is easily oxidised to $Co^{3+}$ in the presence of a strong ligand.
✓

Answer

  1. Because two inner $d-$ orbitals are not available in $Ni$.
  2. Because only $d-$ electrons can be involved in $ð-$ complex.
  3. Because crystal field splitting energy is more than compensated for the third ionisation enthalpy.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Coordination Compounds→Coordination Compounds — all question types→Chemistry STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

Distinguish between methanoic acid and ethanoic acid?
→
Three electrolytic cells $A, B, C$ containing solutions of $ZnSO_4, AgNO_3$ and $CuSO_4,$ respectively are connected in series. A steady current of $1.5$ amperes was passed through them until $1.45\ g$ of silver deposited at the cathode of cell $B.$ How long did the current flow $?$ What mass of copper and zinc were deposited $?$
→
How will you bring about the following conversions?
Iso-propyl chloride to n-propyl chloride.
→
What is a peptide bond or peptide chain? Elaborate on how protein compounds are formed from amino acid compounds.
→
What happens when $D-$glucose is treated with the following reagents?
  1. $HI.$
  2. Bromine water.
  3. $HNO_3.$
→
How do you convert the following:
  1. Prop-1-ene to Propan-2-ol
  2. Bromobenzene to 2-bromoacetophenone
  3. 2-bromobutane to But-2-ene
→
Match the properties given in Column I with the metals given in Column II.
 
Column I (Property)
 
Column II (Metal)
(i)
An element which can show +8 oxidation state
(a)
Mn
(ii)
3d block element that can show upto +7 oxidation state
(b)
Cr
(iii)
3d block element with highest melting point
(c)
Os
   
(d)
Fe
 
→
Complete the following giving the structures of major organic products.
$(\text{CH}_3)_3-\text{C}-\text{Br}\xrightarrow{\text{Mg}}\ .......\ \xrightarrow{\text{H}_2\text{O}}\ ......$
→
While separating a mixture of ortho and para nitrophenols by steam distillation, name the isomer which will be steam volatile. Give reason.
→
Write electrode reactions taking place in:
  1. Ni–Cd cell.
  2. Lead Acid Accumulator.
→