MCQ
The electrons which take part in order to exhibit variable oxidation states by transition metals are
- A$ns$ only
- B$(n - 1)\, d$ only
- ✓$ns$ and $(n -1)\, d$ only but not $np$
- D$(n -1)\, d$ and $np$ only but not $ns$
✓
Answer
Correct option: C.
$ns$ and $(n -1)\, d$ only but not $np$
c
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 value of ionic product of water at $393\,K$ is
→When a 1.8 g sample of hydrogen atom is irradiated with light, a certain fraction of atoms get excited to $n=3$ level and $n=2$ level. When the excited atoms fall back to the ground state, the energy evolved is $5.67 \times 10^5 J$ and $2.65 \times 10^5 J$ respectively. What $\%$ of H atoms do NOT get excited upon irradiation?
→Heat treatment of muscular pain involves radiation of wavelength of about $900\,nm.$ Which spectral line of $H -$ atom is suitable for this purpose?
→$[{R_H} = 1 \times {10^5}\,c{m^{ - 1}},\,h\, = 6.6\, \times {10^{ - 34}}\,Js\,\,c = 3\, \times \,{10^8}\,m{s^{ - 1}}]$
The unit of the van der Waals gas equation parameter $'a'$ in $\left(\mathrm{P}+\frac{\mathrm{an}^{2}}{\mathrm{~V}^{2}}\right)(\mathrm{V}-\mathrm{nb})=\mathrm{n} \mathrm{RT}$ is :
→Consider the following reaction
→${R_2}SiC{l_2} + {H_2}O \to (1)\xrightarrow{{polymerisation}}(2)$
Compound $(2)$ in above reaction is
The $IUPAC$ name of compound is
→In $N{H_3}$ and $P{H_3}$, the common is
→For the estimation of nitrogen, $1.4\, g$ of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in $60\, mL$ of $\frac{M}{10}$ sulphuric acid. The unreacted acid required $20\, mL$ of $\frac{M}{10}$ sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is .....$\%$
→Names of some compounds are given. Which one is not in $IUPAC$ system
→In a adiabatic process the work involved during expansion or compression of an ideal gas is given by