Download App

d-and f-Block Elements — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryd-and f-Block Elements2 Marks
Question
Why do transition elements form complex compounds?
✓

Answer

The tendency of transition metal ion to form complexes is due to following factors :
(i) The transition metal cations are relatively very small in size and have high effective nuclear charge. Thus they have a high positive charge density (charge/size ratio) which facilitates the acceptance of lone pairs of electrons from other molecules or ions.
(ii) The transition metal cations have vacant inner $d$-orbitals which are of appropriate energy to accept lone pair of electrons from the ligands.

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 "2 Marks Questions" from d-and f-Block Elements→d-and f-Block Elements — all question types→Chemistry STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

What are amino acid compounds? Explain the nomenclature of amino acid compounds.
→
Explain the role of the following:
(a) NaCN in froth floatation process.
(b) $I _2$ in the metallurgy of Zr.
(c) Limestone in the metallurgy of Fe.
→
(i) Complete the following reaction :
$CH _2= CH - CH _2- Br \xrightarrow[\text { Peroxide }]{ HBr }$
(ii) How form n-propyl bromide from isopropyl bromide?
→
What happens when $D -$ glucose is treated with the following reagents?
  1. $HI$
  2. Bromine water
  3. $\ce{HNO3}$
→
(a) Write the structural formula of isobutyl alcohol.
(b) Draw the resonance structure of phenol.
→
Explain briefly how $+2$ state becomes more and more stable in the first half of the first row transition elements with increasing atomic number?
→
Write Nernst equation for the following cell. $N i (s)\left| N i ^{2+}(a q)\right|\left| A g ^{+}(a q)\right| A g _{(s)}$
→
Write following conversions:
  1. Nitrobenzene → acetanilide.
  2. Acetanilide → p-nitroaniline.
→
An organic compound contains $69.77\%$ carbon $, 11.63\%$ hydrogen and rest oxygen. The molecular mass of the compound is $86.$ It does not reduce Tollen's reagent but forms an addition compound with sodium hydrogensulphite and give positive iodoform test. On vigorous oxidation it gives ethanoic and propanoic acid. Write the possible structure of the compound.
→
How are $Na , Mg$ and Al are obtained from electrolysis?
→