Chemical Bonding and Molecular Structure's Question 15 | Chemistry XI - Part 1 | NCERT Exemplar Questions

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MCQ (Single Correct Answer)

$$\begin{array}{llllll} A & 1 s^2 & 2 s^2 & 2 p^6 & & \\ B & 1 s^2 & 2 s^2 & 2 p^6 & 3 s^2 & 3 p^3 \\ C & 1 s^2 & 2 s^2 & 2 p^6 & 3 s^2 & 3 p^5 \end{array}$$

Stable form of $C$ may be represented by the formula

$C_2$

$\mathrm{C}_3$

$C_4$

MCQ (Single Correct Answer)

$$\begin{array}{llllll} A & 1 s^2 & 2 s^2 & 2 p^6 & & \\ B & 1 s^2 & 2 s^2 & 2 p^6 & 3 s^2 & 3 p^3 \\ C & 1 s^2 & 2 s^2 & 2 p^6 & 3 s^2 & 3 p^5 \end{array}$$

The molecular formula of the compound formed from $B$ and $C$ will be

$B C$

$B_2 \mathrm{C}$

$B C_2$

$B C_3$

MCQ (Single Correct Answer)

$$\begin{array}{llllll} A & 1 s^2 & 2 s^2 & 2 p^6 & & \\ B & 1 s^2 & 2 s^2 & 2 p^6 & 3 s^2 & 3 p^3 \\ C & 1 s^2 & 2 s^2 & 2 p^6 & 3 s^2 & 3 p^5 \end{array}$$

The bond between $B$ and $C$ will be

ionic

covalent

hydrogen

coordinate

MCQ (Single Correct Answer)

Which of the following order of energies of molecular orbitals of $\mathrm{N}_2$ is correct?

$\left(\pi 2 p_y\right)<\left(\sigma 2 p_z\right)<\left(\pi^* 2 p_x\right) \approx\left(\pi^* 2 p_y\right)$

$\left(\pi 2 p_y\right)>\left(\sigma 2 p_z\right)>\left(\pi^* 2 p_x\right) \approx\left(\pi^* 2 p_y\right)$

$\left(\pi 2 p_y\right)<\left(\sigma 2 p_z\right)<\left(\pi^* 2 p_x\right) \approx\left(\pi^* 2 p_y\right)$

$\left(\pi 2 p_y\right)>\left(\sigma 2 p_z\right)<\left(\pi^* 2 p_x\right) \approx\left(\pi^* 2 p_y\right)$

MCQ (Single Correct Answer)

Which of the following statement is not correct from the view point of molecular orbital theory?

$\mathrm{Be}_2$ is not a stable molecule

$\mathrm{He}_2$ is not stable but $\mathrm{He}_2^{+}$is expected to exist.

Bond strength of $\mathrm{N}_2$ is maximum amongst the homonuclear diatomic molecules belonging to the second period.

The order of energies of molecular orbitals in $\mathrm{N}_2$ molecule is $\sigma 2 s<\sigma^* 2 s<\sigma 2 p_z<\left(\pi 2 p_x \simeq \pi 2 p_y\right)<\left(\pi^* 2 p_x \simeq \pi^* 2 p_y\right)<\sigma^* 2 p_z$

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