MCQ
The bond order of $He_2^ + $ molecule ion is
- A$1$
- B$2$
- ✓$0.5$
- D$0.25$
✓
Answer
Correct option: C.
$0.5$
(c)The electron’s distribution in molecular orbitals is $1{s^2},\,2{s^1}$
$B.O. $ $= \frac{{2 - 1}}{2} = \frac{1}{2} = 0.5$.
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
$\,$
→Given
→$(A)\, n = 5, m_l= + 1$
$(B)\, n =2, l =1, m_l= -1, m_s = -1/2$
The maximum number of electron$(s)$ in an atom that can have the quantum numbers as given in $(A)$ and $(B)$ are respectively
When magnesium burns in air, compounds of magnesium formed are magnesium oxide and
In the equilibrium reaction, N2 + 3H2 ⇔ 2NH3, the sign of ΔH accompanying the reaction is:
In a Lassaignes’s test for sulphur in the organic compound with sodium nitroprusside solution the purple colour formed is due to
The hydrogen-like species $\mathrm{Li}^{2+}$ is in a spherically symmetric state $\mathrm{S}_1$ with one radial node. Upon absorbing light the ion undergoes transition to a state $\mathrm{S}_2$. The state $\mathrm{S}_2$ has one radial node and its energy is equal to the ground state energy of the hydrogen atom.
→$1.$ The state $S_1$ is
$(A)$ $1 \mathrm{~s}$ $(B)$ $2 \mathrm{~s}$ $(C)$ $2 \mathrm{p}$ $(D)$ $3 \mathrm{~s}$
$2.$ Energy of the state $S_1$ in units of the hydrogen atom ground state energy is
$(A)$ $0.75$ $(B)$ $1.50$ $(C)$ $2.25$ $(D)$ $4.50$
$3.$ The orbital angular momentum quantum number of the state $S_2$ is
$(A)$ $0$ $(B)$ $1$ $(C)$ $2$ $(D)$ $3$
Give the answer question $1,2$ and $3.$
The more positive the value of $\text{E}^\ominus,$ the greater is the tendency of the species to get reduced. Using the standard electrode potential of redox couples given below find out which of the following is the strongest oxidising agent: $\text{E}^{\ominus}\text{values:}$ $\text{Fe}^{3+}/ \text{ Fe}^{2+}=+0.77;\text{I}_2(\text{S})/\text{ I}^-=+0.54;$
→$\text{Cu}^{2+}/\text{ Cu}=+0.34;\text{Ag}^+/\text{ Ag}=+0.80\text{V}$
Which one of the following pairs represents the stereoisomerism
de-Broglie equation is
Assuming fully decomposed, the volume of $C{O_2}$ released at $STP$ on heating $9.85\,g$ of $BaC{O_3}$ (Atomic mass of $Ba=137$) will be ................ $\mathrm{L}$
→