MCQ
When $100\,\,ml$ of $M/10\,\,NaOH$ solution and $50\,\,ml$ of $M/5\,\,HCl$ solution are mixed, the $pH$ of resulting solution would be
- A$0$
- ✓$7$
- CLess than $7$
- DMore than $7$
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($A$) $\mathrm{C}_2^{2-}$ is expected to be diamagnetic
($B$) $\mathrm{O}_2{ }^{2+}$ is expected to have a longer bond length than $\mathrm{O}_2$
($C$) $\mathrm{N}_2^{+}$and $\mathrm{N}_2^{-}$have the same bond order
($D$) $\mathrm{He}_2^{+}$has the same energy as two isolated He atoms
${H_2}{O_2}\xrightarrow{{R.T}}{H_2}O + \frac{1}{2}{O_2}$
| Period number | Group number | |
| $Q$ | $2$ | $15$ |
| $P$ | $3$ | $2$ |
Then formula of the compound formed by $P$ and $Q$ element is