MCQ
The order of density in nucleus is
- A${10^8}\,kg/cc$
- B${10^{ - 8}}\,kg/cc$
- C${10^{ - 9}}\,kg/cc$
- ✓${10^{12}}\,kg/cc$
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$\left[\right.$ Given $: \mathrm{N}_{\mathrm{A}}=6.02 \times 10^{23}\, \mathrm{~mol}^{-1}$, Atomic mass of $\mathrm{Na}=23.0\, \mathrm{u}]$

$(A)$ $\mathrm{H}$ and $\mathrm{H}$
$(B)$ $\mathrm{H}$ and $\mathrm{C}_2 \mathrm{H}_5$
$(C)$ $\mathrm{C}_2 \mathrm{H}_5$ and $\mathrm{H}$
$(D)$ $\mathrm{CH}_3$ and $\mathrm{CH}_3$

$\frac{{dx}}{{dt}} = k\left[ P \right]{\left[ Q \right]^{0.5}}{\left[ R \right]^{0.5}}$
Which statement about the above equation is wrong?
$(A)$ $O _2$ is physisorbed
$(B)$ heat is released
$(C)$ occupancy of $\pi_{2 p }^*$ of $O _2$ is increased
$(D)$ bond length of $O _2$ is increased