MCQ
A sample of $100\, ml$ of $0.10\, M$ acid $HA (K_a = 1 \times 10^{-5})$ is titrated with standard $0.2\, M\, KOH.$ How many $ml$ of $KOH$ will have to be added when the $pH$ in the titration flask will be $5.00$ ?
- A$0$
- B$10$
- C$100$
- ✓$50$
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| Period number | Group number | |
| $P$ | $2$ | $15$ |
| $Q$ | $3$ | $2$ |
Then formula of the compound formed by $P$ and $Q$ element is

$(A)$ $\Delta S _{ x \rightarrow z}=\Delta S _{ x \rightarrow y}+\Delta S _{ y \rightarrow z}$
$(B)$ $w_{x \rightarrow z}=w_{x \rightarrow y}+w_{y \rightarrow z}$
$(C)$ $w_{x \rightarrow z \rightarrow z}=w_{x \rightarrow y}$
$(D)$ $\Delta S _{x \rightarrow y \rightarrow z}=\Delta S _{x \rightarrow y}$