JEE Main & Advanced Sample Paper JEE Main Sample Paper-47

  • question_answer
    The substance which is solid at room temperature forms ionic compounds and reacts with hydrogen forming a hydride, the aqueous solution of which is acidic, could be

    A)  aluminium                 

    B)  sodium          

    C)  bromine                     

    D)  iodine

    Correct Answer: D

    Solution :

    Hydride of AI and Na are basic while that of Br and I are acidic. But \[B{{r}_{2}}\] is a liquid at room temperature and \[{{I}_{2}}\] is a solid. Thus, the solid is iodine. \[{{I}_{2}}+{{H}_{2}}\xrightarrow{\,}\,\underset{\begin{smallmatrix}  \text{Hydrogen}\,\,\text{iodide}\, \\  \,\,\,\,\,\,\,\,\,\,\,\,\,\text{(acidic)} \end{smallmatrix}}{\mathop{2HI}}\,\]

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