MCQ
Which electronic configuration must represent an atom in an excited state?
- A$1s^2 ,2s^2 2p^1$
- B$1s^2 ,2s^2 2p^2$
- ✓$1s^2 ,2s^22p^2 ,3s^1$
- D$1s^2 ,2s^2 2p^5$
✓
Answer
Correct option: C.
$1s^2 ,2s^22p^2 ,3s^1$
c
$(c)\, 1s^2,2s^22p^2,3s^1$ (Excited state)
$(c)\, 1s^2,2s^22p^2,3s^1$ (Excited state)
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
A first order reaction has the rate constant $10^{-2}\, sec^{-1}$. If the initial concentration of reactant is $1\, M$ then what will be the rate of reaction after $1\, minute$ ?
→Arrange the following compounds in order of increasing dipole moment.
→(I) Toluene
(II) $m - $dichlorobenzene
(III) $o - $dichlorobenzene
(IV)$p - $dichlorobenzene
Which of the following compound does not give oxyacid of central atom on hydrolysis?
The general molecular formula, which represents the homologous series of alkanols is
From the given data at $298\,K$
→$\Delta H_f^o[CO_2,g] = -394 \,kJ/mol$
$\Delta H_f^o[H_2O,l] = -286\, kJ/mol$
$\Delta H_f^o [propene ,g] = 20\,kJ/mol$
cyclopropane $(g)$ $\to$ propene $(g)$ ; $\Delta H^o_{isomerisation} = $ $-33\,kJ/mol$.
Calculate $\Delta H^o_{combustion}$ [cyclopropane, $(g)$]
......$ kJ/mol$
Which of the structures given' below are chiral ?
Which one of the following elements has the highest ionisation energy
A first order reaction is $50\%$ completed in $20\, minutes$ at $27\,^oC$ and in $10\, minutes$ at $47\,^oC$. The energy of activation of the reaction is....... $Kcal$
→The product of the reaction between ethyl benzene and $N-$ bromosuccinamide is
→Aniline reacts with acetaldehyde to form