MCQ
Atomic mass is equal to:
- ANumber of electrons of an atom.
- ✓Sum of the numbers of electrons and protons of an atom.
- CSum of the numbers of neutrons and protons of an atom.
- DNone of these.
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$(I)$ $XeF_6 +NaF \to Na^+ [XeF_7]^-$ $(II)$ $2PCl_5(s) \to [PCl_4]^+[PCl_6]^-$
$(III)$ $[Al(H_2O)_6]^{3+} + H_2O \to [Al(H_2O)_5OH]^{2+} + H_3O^+$
Possible transformations are:
Assertion $(A)$ : Experimental reaction of $CH _{3} Cl$ with aniline and anhydrous $AlCl _{3}$ does not give $o$ and $p-methylaniline$.
Reason $(R)$ : The - $NH _{2}$ group of aniline becomes deactivating because of salt formation with anhydrous $AlCl _{3}$ and hence yields $m$-methyl aniline as the product.
In the light of the above statements, choose the most appropriate answer from the options given below.

