MCQ
The atomic number of an element is derived from
- ANumber of electrons
- ✓Number of protons
- CNumber of neutrons
- DNumber of isotopes
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Assertion ($A$): Enthalpy of neutralisation of strong monobasic acid with strong monoacidic base is always $-57 \mathrm{~kJ} \mathrm{~mol}^{-1}$
Reason ($R$): Enthalpy of neutralisation is the amount of heat liberated when one mole of $\mathrm{H}^{+}$ions furnished by acid combine with one mole of ${ }^{-} \mathrm{OH}$ ions furnished by base to form one mole of water. In the light of the above statements, choose the correct answer from the options given below.
$2NOBr(g)\,\,\rightleftharpoons \,\,2NO(g)\,\,+\,\,Br_2(g),$ where $P$ is the total pressure of gases at equilibrium and $P_{Br_2}\,\,=\,\,\frac {P}{9}$

