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$(I)$ The radius of an anion is larger than that of the parent atom.
$(II)$ The ionization energy generally increases with increasing atomic number in a period.
$(III)$ The electronegativity of an element is the tendency of an isolated atom to attract an electron.
Which of the above statements is/are correct?
$(A)$ $O$ - $O$ bond lengths are equal.
$(B)$ Thermal decomposition of $O _3$ is endothermic.
$(C)$ $O _3$ is diamagnetic in nature.
$(D)$ $O _3$ has a bent structure.
$HSO_4^- = 1.2 \times 10^{- 2} ,H_2PO_4^- = 6.3 \times 10^{-8} ,$$HCO_3^- = 4.7 \times 10^{-11}$
Statement $I :$ Pure Aniline and other arylamines are usually colourless.
Statement $II :$ Arylamines get coloured on storage due to atmospheric reduction.
In the light of the above statements, choose the most appropriate answer from the options given below:
