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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$(a)$ $2N_2O_5\rightarrow\,\,4NO_2(g)+O_2(g)-\frac{d[N_2O_5]}{dt}=k[N_2O_5]$
$(a)$ $N_2O_5\rightarrow\,\,2NO_2(g)+1/2\,\,O_2(g)-\frac{d[N_2O_5]}{dt}=k'[N_2O_5]$
which of the following is true ?
