MCQ
The elements with atomic number $10, 18, 36, 54$ and $86$ are all
- ALight metals
- ✓Inert gases
- CHalogens
- DRare-earths
✓
Answer
Correct option: B.
Inert gases
b
$(b)$ Inert gases, these have $n{s^2}n{p^6}$ configuration.
$(b)$ Inert gases, these have $n{s^2}n{p^6}$ configuration.
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
The compound ‘$A$’ having formula ${C_8}{H_{10}}$ (aromatic) which gives $1$ mononitro substitute and $3$ nitrosubstitute compound is
→A compound has $50\%$ carbon, $50\%$ oxygen and approximate molecular weight is $290$. Its molecular formula is
→In a reaction $N_2(g) + 3H_2(g) \to 2NH_3(g)$ the rate of appearance of $NH_3$ is $2.5 \times 10^{-4}\,mol\,L^{-1}\,s^{-1}$ . The rate of reaction and rate of disappearance of $H_2$ will be (In $mol\,L^{-1}\,sec^{-1})$
→Anhydrous $AlC{l_3}$ is obtained from
→If equivalent conductance of $1\,M$ benzoic acid is $12.8\, ohm^{-1}\, cm^2\, eq^{-1}$ and if the equivalent conductances of benzoate ion and $H^+$ ion at infinite dilution are $42$ and $288.42\, ohm^{-1}\, cm^2\, eq^{-1}$ respectively, then its degree of dissociation is ............ $\%$
→In the given reaction, only one alkene undergo preferential oxidation by electrophilic ozone. Identify product $(P)$ of the given reaction
→Which of the following order is $CORRECT$
→The increasing order of electron affinity of the electronic configurations of element is
→$(I)\, 1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^5$
$(II)\, 1s^2\, 2s^2\, 2p^3$
$(III)\, 1s^2\, 2s^2\, 2p^5$
$(IV)\, 1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^1$
A compound contains $69.5\%$ oxygen and $30.5\%$ nitrogen and its molecular weight is $92.$ The molecular formula of the compound is
→What is the major product of above Friedel-Craft reaction ?
