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  5. The p-Block Elements-I / p-ब्लॉक के कुछ तत्व-I

12th Class Chemistry The p-Block Elements-I / p-ब्लॉक के कुछ तत्व-I Question Bank MCQs - The p-Block Elements

  • question_answer
    A gas (X) is obtained when copper reacts with dilute \[HN{{O}_{3}}\]. The gas thus formed reacts with oxygen to give brown fumes of (Y). (Y) when dissolved in water gives an important acid (Z) and the gas (X). X, Y and Z respectively are

    A) \[NO\,\,;\,\,N{{O}_{2}}\,\,\,;\,\,HN{{O}_{3}}\]

    B) \[N{{O}_{2}}\,\,;\,\,NO\,\,;\,\,HN{{O}_{3}}\]

    C) \[{{N}_{2}}O\,\,;\,\,NO\,\,;\,\,HN{{O}_{2}}\]

    D) \[NO\,\,\,;\,\,{{N}_{2}}O\,\,;\,\,HN{{O}_{3}}\]

    Correct Answer: A

    Solution :

    \[3Cu+8HN{{O}_{3}}(dil.)\to 3Cu{{(N{{O}_{3}})}_{2}}+\underset{(X)}{\mathop{2NO}}\,+4{{H}_{2}}O\] \[2NO+{{O}_{2}}\to \underset{(Y)}{\mathop{2N{{O}_{2}}}}\,\] \[3N{{O}_{2}}+{{H}_{2}}O\to \underset{(Z)}{\mathop{2HN{{O}_{3}}}}\,+\underset{(X)}{\mathop{NO}}\,\]


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