MCQ
Which element exist in free state mainly
- A$Hg$
- B$Fe$
- ✓$Au$
- D$Zn$
Metals that are least reactive exist in free state in nature.
Some of the elements that are found in free state in nature are Gold$(Au)$,Platinum( $Pt )$, Silver$(Ag)$,etc.
Therefore, $\operatorname{Gold}( Au )$ is a metal that is found in free state in nature.
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$(a)\;\;60\; \mathrm{mL} \frac{\mathrm{M}}{10}\; \mathrm{HCl}+40 \;\mathrm{mL} \frac{\mathrm{M}}{10} \;\mathrm{NaOH}$
$(b)\;\;55\; \mathrm{mL} \frac{\mathrm{M}}{10}\; \mathrm{HCl}+45 \;\mathrm{mL} \frac{\mathrm{M}}{10} \;\mathrm{NaOH}$
$(c)\;\;75\; \mathrm{mL} \frac{\mathrm{M}}{5}\; \mathrm{HCl}+25 \;\mathrm{mL} \frac{\mathrm{M}}{5} \;\mathrm{NaOH}$
$(d)\;\;100\; \mathrm{mL} \frac{\mathrm{M}}{10}\; \mathrm{HCl}+100 \;\mathrm{mL} \frac{\mathrm{M}}{10} \;\mathrm{NaOH}$
$pH$ of which one of them will be equal to $1$ ?