JEE Main & Advanced JEE Main Paper Phase-I (Held on 07-1-2020 Evening)

  • question_answer
    Among statements (A)-(D) the correct ones are:
    (A) Decomposition of hydrogen peroxide gives dioxygen.
    (B) Like hydrogen peroxide, compounds, such as \[KCl{{O}_{3}},Pb\,{{(N{{O}_{3}})}_{2}}\] and \[NaN{{O}_{3}}\]when heated liberate dioxygen.
    (C) 2-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide.
    (D) Hydrogen peroxide is used for the manufacture of sodium perborate.
    [JEE MAIN Held on 07-01-2020 Evening]

    A) (A) and (C) only

    B) (A), (B) and (C) only

    C) (A), (B), (C) and (D)

    D) (A), (C) and (D) only

    Correct Answer: C

    Solution :

    [c] \[{{H}_{2}}{{O}_{2}}\xrightarrow{\Delta }\,{{H}_{2}}O+\frac{1}{2}\,{{O}_{2}}\] \[KCl{{O}_{3}},\text{ }Pb{{(N{{O}_{3}})}_{2}},\text{ }NaN{{O}_{3}}\] on heating will release \[{{O}_{2}}\] gas. \[\underset{Sodium\,metaborte}{\mathop{2\,NaB{{O}_{2}}}}\,+2{{H}_{2}}{{O}_{2}}+6{{H}_{2}}O\xrightarrow{{}}\]\[N{{a}_{2}}\left[ \underset{Sodium\,Peroxoborate}{\mathop{{{(OH)}_{2}}B{{(O-O)}_{2}}}}\,B{{(OH)}_{2}} \right]\,.6{{H}_{2}}O\]

You need to login to perform this action.
You will be redirected in 3 sec spinner