MCQ
An element $A$ dissolves both in acid and alkali. It is an example of
- AAllotropic nature of $A$
- BDimorphic nature of $A$
- CAmorphous nature of $A$
- ✓Amphoteric nature of $A$
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${A_2}(g) + 4{B_2}(g) \rightleftharpoons 2A{B_4}(g)\,;\,\Delta H < 0$
the formation of $AB_4(g)$ will be favoured by

Statement $I:$ In the titration between strong acid and weak base methyl orange is suitable as an indicator.
Statement $II:$ For titration of acetic acid with $\mathrm{NaOH}$ phenolphthalein is not a suitable indicator.
In the light of the above statements, choose the most appropriate answer from the options given below: