JEE Main & Advanced Chemistry The s-Block Elements / s-ब्लॉक के तत्व Question Bank Alkali Metals

  • question_answer
    Potassium is kept in [CPMT 1976]

    A) Alcohol

    B) Water

    C) Kerosene

    D) Liquid ammonia

    Correct Answer: C

    Solution :

    Alkali metals are highly reactive metals. They react with Alcohol - \[2{{C}_{2}}{{H}_{5}}OH+2K\to 2{{C}_{2}}{{H}_{5}}OK+{{H}_{2}}\] Water - \[2K+2{{H}_{2}}O\to 2KOH+{{H}_{2}}\] Ammonia - \[K+(x+y)N{{H}_{3}}\to \underset{\text{Ammoniated }\,\text{cation}}{\mathop{{{\left[ K{{(N{{H}_{3}})}_{x}} \right]}^{+}}}}\,+\]\[\underset{Ammoniated\,\,electron}{\mathop{{{[e{{(N{{H}_{3}})}_{y}}]}^{-}}}}\,\] But they do not react with kerosene.

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