First slide

Hydrogen

Question

Statement 1 : $H_{2}$ molecule is more stable than He-H molecule.
Statement 2 : The antibonding electron in He-H molecule decreases the bond order there by the stability.

Moderate

A

Both Statement 1 and Statement 2 are true.
B

Statement 1 is true and Statement 2 is false.
C

Statement 1 is false and Statement 2 is true.
D

Both Statement 1 and Statement 2 are false.

Solution

Bond order = $\frac{1}{2} (n_{b} - n_{a})$ ;
where, n_b = no.of bonding electrons ; n_a = no.of anti bonding electrons
Bond order for H₂ =1 $(σ_{1 s^{2}} σ_{1 s^{2}}^{})$
Bond order for $He - H = \frac{1}{2}$ $(σ_{1 s^{2}} σ_{1 s^{1}}^{})$

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