MCQ
The maximum valency of an element with atomic number $7$ is
- A$2$
- ✓$5$
- C$4$
- D$3$
✓
Answer
Correct option: B.
$5$
b
(b) Valency is according to valence shall configuration which here is $1{s^2},2{s^2},2{p^3},\,\,ie.\,5$
(b) Valency is according to valence shall configuration which here is $1{s^2},2{s^2},2{p^3},\,\,ie.\,5$
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
One among the following compounds will not give effervescence with sodium carbonate
The solubility of $CuBr$ is $2 \times {10^{ - 4}}\,mol/l$ at $25\,^oC$. The ${K_{sp}}$ value for $CuBr$ is
→A large difference between the fourth and fifth ionization energies indicates the presence of
The energy of an electron revolving in ${n^{th}}$ Bohr's orbit of an atom is given by the expression
→A piston filled with $0.04\, mol$ of an ideal gas expands reversibly from $50.0\, mL$ to $375\, mL$ at a constant temperature of $37.0\,^oC.$ As it does so, it absorbs $208\, J$ of heat. The values of $q$ and $w$ for the process will be
→$(R = 8.314 \,J/mol\,K)\,(\ln 7.5 =2.01)$
The reaction of Lucas reagent is fast with
The below Reaction produce through
When ' $\mathrm{x}$ ' $\times 10^{-2} \mathrm{~mL}$ methanol (molar mass $=32 \mathrm{~g}$; density $=0.792 \mathrm{~g} / \mathrm{cm}^3$ ) is added to $100 \mathrm{~mL}$ water (density $=1 \mathrm{~g} / \mathrm{cm}^3$ ), the following diagram is obtained.
→(Image)
$x=$.. . . . . .(nearest integer)
[Given: Molal freezing point depression constant of water at $273.15 \mathrm{~K}^2$ is $1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$ ]
Lattice energy (numerical value) of chloride of alkali metals is in order
Which of the following does not reduce fehling's solution ?