MCQ
What is chemistry?
- AStudy of substances.
- BInvestigation of reactions and properties.
- CStudy of reactions to form new substances.
- DAll of the above.
Explanation:
Chemistry can be defined in many ways as it is study of substance, investigation of reactions and properties and also the study of reactions to form new substance.
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Assertion $(A)$ : Boron is unable to form $BF _{6}^{3-}$
Reason $(R)$ : Size of $B$ is very small.
In the light of the above statements, choose the correct answer from the options given below.

(Atomic no. : $B = 5,S = 16,Ni = 28,Xe = 54$)
$\mathrm{A}_{2}(\mathrm{g})+\mathrm{B}_{2}(\mathrm{g}) \rightleftharpoons \mathrm{X}_{2}(\mathrm{g}) \Delta_{r} \mathrm{H}=-\mathrm{X} \mathrm{kJ} ?$