Download App

Elements of Groups 16, 17 and 18 — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryElements of Groups 16, 17 and 182 Marks
Question
Give reason: Group $16^{th}$ elements have lower ionisation enthalpy compared to group $15^{th}$ elements. Write two uses of dioxygen.
✓

Answer

Group $15$ elements have extra stable, half$-$filled $p-$orbitals with outer electronic configuration $(ns^2 np^3).$ Therefore, more amount of energy is required to remove an electron compared to that of the partially filled orbitals $(ns^2 np^4)$ of group $16$ elements of the corresponding period. Hence, elements of group $16$ have lower ionization enthalpy values compared to those of group $15$ elements.
two uses of dioxygen:
$1.$ Dioxygen is important for respiration to sustain animal and aquatic life.
$2.$ It is used in the manufacture of steel.

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 "Answer the following in one or two sentence." from Elements of Groups 16, 17 and 18→Elements of Groups 16, 17 and 18 — all question types→Chemistry STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

How is benzophenone prepared from benzonitrile?
→
‘Universe is an isolated system’. Explain.
→
Calculate activation energy for a reaction of which rate constant becomes four times when temperature changes from $30^{\circ} C$ to $50^{\circ} C$. (Given : $R =8.314 K ^{-1} mol ^{-1}$ )
→
n-butyl chloride + sodium.
→
The resistance of a solution is $2.5 \times 10^3$ ohm. Find the conductance of the solution.
→
A compound crystallizes in bcc structure. What is unit cell edge length if diameter of its atom is $120\ pm?$
→
On complete hydrolysis DNA gives equimolar quantities of adenine and thymine. Give scientific reasons.
→
In what way $K _{ f }$ and $K _{ b }$ are similar and in what way they are different?
→
Deduce first law of thermodynamics for $: (a)$ isothermal process $(b)$ isochoric process
→
State the main functions of enzymes.
→