NEET Chemistry MCQs

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    NEET Questions / Chemistry

    17982.

    Of the ions Zn2+,  Ni2+{\rm{Z}}{{\rm{n}}^{2 + }},{\rm{\;N}}{{\rm{i}}^{2 + }} and Cr3+{\rm{C}}{{\rm{r}}^{3 + }}, (atomic number of Zn=30, Ni=28, Cr=24)

    A

    All three are coloured

    B

    All three are colourless

    C

    Only Zn2+{\rm{Z}}{{\rm{n}}^{2 + }} is colourless and Ni2+{\rm{N}}{{\rm{i}}^{2 + }} and Cr3+{\rm{C}}{{\rm{r}}^{3 + }} are coloured

    D

    Only Ni2+{\rm{N}}{{\rm{i}}^{2 + }} is coloured and Zn2+{\rm{Z}}{{\rm{n}}^{2 + }} and Cr3+{\rm{C}}{{\rm{r}}^{3 + }} are colourless

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    17984.

    KMnO4{\rm{KMn}}{{\rm{O}}_4} in basic medium is reduced to

    A

    K2MnO4{{\rm{K}}_2}{\rm{Mn}}{{\rm{O}}_4}

    B

    MnO2{\rm{Mn}}{{\rm{O}}_2}

    C

    Mn(OH)2{\rm{Mn}}{\left( {{\rm{OH}}} \right)_2}

    D

    Mn2+{\rm{M}}{{\rm{n}}^{2 + }}

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    17986.

    Transition metals form complexes in their zero oxidation state. The example of the above fact is:

    A

    Mn2(CO)10{\rm{M}}{{\rm{n}}_2}{\left( {{\rm{CO}}} \right)_{10}}

    B

    [Cu(NH3)4]Cl2\left[ {{\rm{Cu}}{{\left( {{\rm{N}}{{\rm{H}}_3}} \right)}_4}} \right]{\rm{C}}{{\rm{l}}_2}

    C

    Zn2[Fe(CN)6]{\rm{Z}}{{\rm{n}}_2}\left[ {{\rm{Fe}}{{\left( {{\rm{CN}}} \right)}_6}} \right]

    D

    [Ag(NH3)2]OH\left[ {{\rm{Ag}}{{\left( {{\rm{N}}{{\rm{H}}_3}} \right)}_2}} \right]{\rm{OH}}

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    17988.

    Calomel is:

    A

    Hg2Cl2{\rm{H}}{{\rm{g}}_2}{\rm{C}}{{\rm{l}}_2} and Hg

    B

    HgCl2{\rm{HgC}}{{\rm{l}}_2}

    C

    Hg+HgCl2{\rm{Hg}} + {\rm{HgC}}{{\rm{l}}_2}

    D

    Hg2Cl2{\rm{H}}{{\rm{g}}_2}{\rm{C}}{{\rm{l}}_2}

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    17989.

    Which of the following reactions represents developing in photography?

    A

    AgNO3+NaBroAgBr+NaNO3{\rm{AgN}}{{\rm{O}}_3} + {\rm{NaBr}} o {\rm{AgBr}} + {\rm{NaN}}{{\rm{O}}_3}

    B

    AgBr+2NH3o[Ag(NH3)2]Br{\rm{AgBr}} + 2{\rm{N}}{{\rm{H}}_3} o \left[ {{\rm{Ag}}{{\left( {{\rm{N}}{{\rm{H}}_3}} \right)}_2}} \right]{\rm{Br}}

    C

    AgBr+2Na2S2O3  oNa3[Ag(S2O3)2]+NaBr{\rm{AgBr}} + 2{\rm{N}}{{\rm{a}}_2}{{\rm{S}}_2}{{\rm{O}}_3}{\rm{\;}} o {\rm{N}}{{\rm{a}}_3}\left[ {{\rm{Ag}}{{\left( {{{\rm{S}}_2}{{\rm{O}}_3}} \right)}_2}} \right] + {\rm{NaBr}}

    D

    C6H4(OH)2+2AgBrxoC6H4O2+2HBr+2Ag{{\rm{C}}_6}{{\rm{H}}_4}{\left( {{\rm{OH}}} \right)_2} + 2{\rm{AgB}}{{\rm{r}}^{\rm{x}}} o {{\rm{C}}_6}{{\rm{H}}_4}{{\rm{O}}_2} + 2{\rm{HBr}} + 2{\rm{Ag}}

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    17990.

    Chromium compound used in tanning of leather is:

    A

    Cr2O3{\rm{C}}{{\rm{r}}_2}{{\rm{O}}_3}

    B

    CrO2Cl2{\rm{Cr}}{{\rm{O}}_2}{\rm{C}}{{\rm{l}}_2}

    C

    CrCl3{\rm{CrC}}{{\rm{l}}_3}

    D

    K2SO4.Cr2(SO4)3.24H2O{{\rm{K}}_2}{\rm{S}}{{\rm{O}}_4}.{\rm{C}}{{\rm{r}}_2}{\left( {{\rm{S}}{{\rm{O}}_4}} \right)_3}.24{{\rm{H}}_2}{\rm{O}}

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