Question
What is d-block element? Explain classification of d-block element?
✓
Answer
→ The d-block of the periodic table contains the elements of the groups 3-12 in which the d orbitals are progressively filled in each of the four long periods.
→ The name transition metals is often used to refer to the elements of d-block
→ There are mainly three series of the transition metals, 3d series (Sc to Zn), 4d series (Y to Cd) and 5d series (La and Hf to Hg).
→ The fourth 6d series which begins with Ac is still incomplete.
→ The name transition metals is often used to refer to the elements of d-block
→ There are mainly three series of the transition metals, 3d series (Sc to Zn), 4d series (Y to Cd) and 5d series (La and Hf to Hg).
→ The fourth 6d series which begins with Ac is still incomplete.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
(i) When does sickle cell anemia disease appears?
(ii) What is the difference between the structure formula of thymine and uracil?
(iii) Define heredity and chromosome.
(ii) What is the difference between the structure formula of thymine and uracil?
(iii) Define heredity and chromosome.
Consider the decomposition of hydrogen peroxide in alkaline medium which is catalysed by iodide ions.
$\text{2H}_2\text{O}_2\xrightarrow{\text{OH}^-}2\text{H}_2\text{O}+\text{O}_2$
This reaction takes place in two step as given below:
Step-I $\text{H}_2\text{O}_2+\text{I}^-\rightarrow\text{H}_2\text{O}_2+\text{IO}^-\text{ (slow)}$
Step-II $\text{H}_2\text{O}_2+\text{IO}^-\rightarrow\text{H}_2\text{O}_2+\text{I}+\text{O}_2\text{ (fast})$
→$\text{2H}_2\text{O}_2\xrightarrow{\text{OH}^-}2\text{H}_2\text{O}+\text{O}_2$
This reaction takes place in two step as given below:
Step-I $\text{H}_2\text{O}_2+\text{I}^-\rightarrow\text{H}_2\text{O}_2+\text{IO}^-\text{ (slow)}$
Step-II $\text{H}_2\text{O}_2+\text{IO}^-\rightarrow\text{H}_2\text{O}_2+\text{I}+\text{O}_2\text{ (fast})$
- Write the rate law expression and determine the order of reaction w.r.t. H2O2.
- What is the molecularity of each individual step?
State the limitations of Valence bond theory
Write down uses of lanthanoids and its compounds.
Answer the following questions on the basis of the given plot of potential energy vs reaction coordinate:
- What is the threshold energy for the reaction?
- What is the activation energy for forward reaction?
- What is the activation energy for backward reaction?
- What is enthalpy change for the forward reaction?
Calculate the mass percentage of aspirin (C9H8O4) in acetonitrile (CH3CN) when 6.5 g of C9H8O4 is dissolved in 450 g of CH3CN.
Explain why,
The dipole moment of chlorobenzene is lower than that of cyclohexyl chloride?
The dipole moment of chlorobenzene is lower than that of cyclohexyl chloride?
Discuss the physical properties of carboxylic acids in terms of their physical state and boiling point.
Explain nucleophilic addition reaction of aldehydes and ketones with sodium hydrogensulphite (NaHSO3). ### Explain the nucleophilic addition reaction which is useful for separation and purification of aldehydes.
How would you determine the standard electrode potential of the system Mg2+|Mg?