1.

    The pair of metals which dissolve in NaOH(aqaq.) is:

    A

    Al, Cu

    B

    Zn, Cd

    C

    Pb, Sn

    D

    Zn, Al

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:d- and f-Block Elements
    🎯Topic:Characteristic Properties
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Amphoteric metals, Reactions with bases

    Related Questions

    1.

    Two of the constituents of German silver are

    A

    Ag + Cu

    B

    Ag + Zn

    C

    Cu + Zn

    D

    Cu + Sn

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:d- and f-Block Elements
    🎯Topic:Characteristic Properties
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Alloys, Composition of German Silver

    2.

    Percentage of silver in German silver is:

    A

    1.5%1.5\%

    B

    2.5%2.5\%

    C

    10%10\%

    D

    Zero percent

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:d- and f-Block Elements
    🎯Topic:Characteristic Properties
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :composition of alloys, German silver

    3.

    Which oxide is least stable at room temperature?

    A

    CuO

    B

    Ag2O{\rm{A}}{{\rm{g}}_2}{\rm{O}}

    C

    ZnO

    D

    Sb2O3{\rm{S}}{{\rm{b}}_2}{{\rm{O}}_3}

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:d- and f-Block Elements
    🎯Topic:Characteristic Properties
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :stability of oxides, decomposition temperature, metal reactivity

    4.

    The spin-only magnetic moment value for the complex [Co(CN)6]4βˆ’{\left[ {Co{{\left( {CN} \right)}_6}} \right]^{4 - }} is _____BM.

    A

    3\sqrt 3

    B

    15\sqrt {15}

    C

    8\sqrt 8

    D

    24\sqrt {24}

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:d- and f-Block Elements
    🎯Topic:Characteristic Properties
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Coordination Chemistry, Crystal Field Theory, Spin-Only Magnetic Moment

    5.

    Most of the transition metals are paramagnetic due to the presence of:

    A

    Completed dd-orbitals

    B

    Completed ff-orbitals

    C

    Unpaired electrons

    D

    None of these

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:d- and f-Block Elements
    🎯Topic:Characteristic Properties
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :paramagnetism, transition metals, electron configuration

    6.

    Which of the following represents ammonium molybdate?

    A

    (NH4)2MoO4{\left( {{\rm{N}}{{\rm{H}}_4}} \right)_2}{\rm{Mo}}{{\rm{O}}_4}

    B

    (NH4)MoO2\left( {{\rm{N}}{{\rm{H}}_4}} \right){\rm{Mo}}{{\rm{O}}_2}

    C

    (NH4)2MoO3{\left( {{\rm{N}}{{\rm{H}}_4}} \right)_2}{\rm{Mo}}{{\rm{O}}_3}

    D

    NH4.12MoO3{\rm{N}}{{\rm{H}}_4}.12{\rm{Mo}}{{\rm{O}}_3}

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:d- and f-Block Elements
    🎯Topic:Characteristic Properties
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :chemical nomenclature, polyatomic ions, chemical formulas

    7.

    Zn gives H2{{\rm{H}}_2} gas with H2SO4{{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4} and HCl but not with HNO3{\rm{HN}}{{\rm{O}}_3} because:

    A

    Zn acts as an oxidising agent when react with HNO3{\rm{HN}}{{\rm{O}}_3}

    B

    HNO3{\rm{HN}}{{\rm{O}}_3} is weaker acid than H2SO4{{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4} and HCl

    C

    In electrochemical series Zn is above hydrogen

    D

    NO3βˆ’{\rm{NO}}_3^ - ion is reduced in preference to hydronium ion

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:d- and f-Block Elements
    🎯Topic:Characteristic Properties
    πŸŽ“ Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Redox reactions, Electrochemical series, Reduction potential

    8.

    Coinage alloy has the composition of:

    A

    Ag + Cu + Ni

    B

    Au + Ag + Cu

    C

    Au + Zn + Ag

    D

    Ag + Fe + Cu

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:d- and f-Block Elements
    🎯Topic:Characteristic Properties
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Materials Science, Alloys, Composition

    9.

    Which transition elements exhibit +8 oxidation states?

    A

    Cu, Zn

    B

    Ru, Os

    C

    Ag, Au

    D

    Cu, Cr

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:d- and f-Block Elements
    🎯Topic:Characteristic Properties
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Transition Metals, Oxidation States, Periodic Trends

    10.

    Which of the following statements is not true in regard to transition elements?

    A

    They exhibit variable oxidation states.

    B

    They form colored compounds.

    C

    They are paramagnetic.

    D

    They have low melting points.

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:d- and f-Block Elements
    🎯Topic:Characteristic Properties
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :transition elements, electronic configuration, variable valency, complex compounds, colour of ions

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