Download App

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

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe d-and f-Block Elements2 Marks
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.

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 The d-and f-Block Elements→The d-and f-Block Elements — all question types→Chemistry STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Short note on : Cellulose.
→
Describe the principle involved in each of the following processes.
  1. Mond process for refining of Nickel.
  2. Column chromatography for purification of rare elements.
→
Give the structures of A, B and C in the following reaction:$\text{CH}_3\text{COOH}\xrightarrow[\Delta]{\text{NH}_3}\text{A}\xrightarrow[]{\text{NaOBr}}\text{B}\xrightarrow[]{\text{NaNO}_2/\text{HCl}}\text{C}$
→
The reaction between $A$ and $B$ is first order with respect to $A$ and zero order with respect to $B$. Fill in the blanks in the following table:
Experiment $[A]/mol L^{-1}$ $[B]/mol L^{-1}$ Initial rate/mol $L^{-1}\ min^{-1}$
$I$ $0.1$ $0.1$ $2.0 \times 10^{-2}$
$II$ - $0.2$ $4.0 \times 10^{-2}$
$III$ $0.4$ $0.4$ -
$IV$ - $0.2$ $2.0 \times 10^{-2}$
→
For the first order thermal decomposition reaction, following data were obtained:
$C_2H_5Cl(g)$ $\xrightarrow{\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }}$ $C_2H_4(g) + HCl(g)$
Time/sec   Total pressure/atm
$0$   $0.30$
$300$   $0.50$
Calculate the rate constant.
$($Given $: \log 2 = 0.301, \log 3 = 0.4771, \log 4 = 0.6021)$
→
Answer the following question:
$ClF_3$ exists but $FCl_3$ does not. Explain.
→
  1. Why are aquatic species more comfortable in cold water than in warm water?
  2. What happens when we place the blood cell in saline water solution (hypertonic solution)? Give reason.
→
Write a note оп formation of amine compounds by reduction of nitro compounds.
→
The rate of a particular reaction triples when temperature changes from $50^\circ C$ to $100^\circ C.$ Calculate the activation energy of the reaction.$[\log 3 = 0.4771;\ R = 8.314\ JK^{-1}\ mol^{-1}].$
→
Why does white $\mathrm{ZnO}(\mathrm{s})$ becomes yellow upon heating?
→