MCQ
Avogadro number is
- ANumber of atoms in one gram of element
- BNumber of millilitres which one mole of a gaseous substances occupies at $NTP$
- ✓Number of molecules present in one gram molecular mass of a substance
- DAll of these
It is equal to $6.022 \times 10^{23}$.
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$(a)$ $X < Y < Z$ $(b) X < Z < Y$
$(c) Y < Z < X$ $(d) Z < Y < X$

Assertion : The $pH$ of water increases with increase in temperature.
Reason : The dissociation of water into $H^+$ and $OH^-$ is an exothermic reaction.