1.

    Which of the following statements regarding the oxoacids of phosphorus is INCORRECT?

    A

    Orthophosphoric acid (H3PO4H_3PO_4) is a tribasic acid.

    B

    Hypophosphorous acid (H3PO2H_3PO_2) is a tribasic acid.

    C

    Pyrophosphoric acid (H4P2O7H_4P_2O_7) is a tetrabasic acid.

    D

    Phosphorous acid (H3PO3H_3PO_3) is a dibasic acid.

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Classification Of Elements
    🎯Topic:Nitrogen Family [Group-15]
    🎓 Ncert Level:Understanding
    🎯Difficulty :Hard
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :p-block elements, oxoacids of phosphorus, basicity

    Related Questions

    1.

    During the Lassaigne's test for an organic compound containing nitrogen and sulfur, the extract is treated with FeCl3FeCl_3. A blood-red color is observed. What complex is formed that causes this color?

    A

    Ferric ferrocyanide

    B

    Ferric thiocyanate

    C

    Sodium thiocyanate

    D

    Ferrous thiocyanate

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Classification Of Elements
    🎯Topic:Nitrogen Family [Group-15]
    PYQ YEAR: 2023
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Lassaigne's Test, Qualitative Analysis

    2.

    Which are true statements among the following?(1) PH5andBiCl5{\rm{P}}{{\rm{H}}_5}{\rm{ and BiC}}{{\rm{l}}_5} does not exist (2)pπ−dπp\pi - d\pi bonds are present in SO2{\rm{S}}{{\rm{O}}_2} (3) Electrons travel with speed of light (4)SeF4 andCH4{\rm{Se}}{{\rm{F}}_4}\,{\rm{and C}}{{\rm{H}}_4} has same shape (5)I3+{\rm{I}}_3^ + has bent geometry

    A

    1,31,{\rm{ }}3

    B

    1,2,51,{\rm{ }}2,{\rm{ }}5

    C

    1,3,51,{\rm{ }}3,{\rm{ }}5

    D

    1,2,41,{\rm{ }}2,{\rm{ }}4

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Classification Of Elements
    🎯Topic:Nitrogen Family [Group-15]
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :chemical bonding, molecular geometry, electronic configuration, pi-bonding

    3.

    Which of the following oxides is most acidic

    A

    AS2O5A{S_2}{O_5}

    B

    P2O5{P_2}{O_5}

    C

    N2O5{N_2}{O_5}

    D

    Sb2O5S{b_2}{O_5}

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Classification Of Elements
    🎯Topic:Nitrogen Family [Group-15]
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :acidity of oxides, periodic trends, electronegativity

    4.

    In which of the following compounds, nitrogen exhibits highest oxidation state.

    A

    NH3

    B

    N2O

    C

    HNO3

    D

    NO2

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Classification Of Elements
    🎯Topic:Nitrogen Family [Group-15]
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :oxidation state, chemical formula

    5.

    Ammonia gas reacts with an aqueous solution of copper(II) ions to form a deep blue complex. What is the coordination number of copper in this complex?

    A

    2

    B

    4

    C

    6

    D

    8

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Classification Of Elements
    🎯Topic:Nitrogen Family [Group-15]
    PYQ YEAR: 2020
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Coordination Compounds

    6.

    Which of the following statements regarding the oxoacids of phosphorus is INCORRECT?

    A

    Orthophosphoric acid (H3PO4H_3PO_4) is a tribasic acid.

    B

    Hypophosphorous acid (H3PO2H_3PO_2) is a tribasic acid.

    C

    Pyrophosphoric acid (H4P2O7H_4P_2O_7) is a tetrabasic acid.

    D

    Phosphorous acid (H3PO3H_3PO_3) is a dibasic acid.

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Classification Of Elements
    🎯Topic:Nitrogen Family [Group-15]
    🎓 Ncert Level:Understanding
    🎯Difficulty :Hard
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :p-block elements, oxoacids of phosphorus, basicity

    7.

    PCl3PC{l_3} react with water to form

    A

    PH3P{H_3}

    B

    H3PO3+HCl{H_3}P{O_3} + HCl

    C

    POCl3POC{l_3}

    D

    H3PO3{H_3}P{O_3}

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Classification Of Elements
    🎯Topic:Nitrogen Family [Group-15]
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Chemical Reactions, Hydrolysis, Phosphorus Chemistry

    8.

    Urea reacts with water to form X which decomposes to form Y. When Y is passed through Cu2+(aq)Cu^{2+}(aq), a deep blue colour solution Z is formed. What is the formula of Z?

    A

    [Cu(NH3)4]2+[Cu(NH_3)_4]^{2+}

    B

    [Cu(H2O)4]2+[Cu(H_2O)_4]^{2+}

    C

    [Cu(NH3)2(H2O)2]2+[Cu(NH_3)_2(H_2O)_2]^{2+}

    D

    [Cu(CN)4]2−[Cu(CN)_4]^{2-}

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Classification Of Elements
    🎯Topic:Nitrogen Family [Group-15]
    PYQ YEAR: 2020
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :p-Block Elements, Coordination Compounds

    9.

    The product obtained as a result of a reaction of nitrogen with CaC2 Ca{C_2}\, is:

    A

    CaCN₂ and C

    B

    Ca(CN)₂ and C

    C

    CaC₂N and C

    D

    Ca₂CN and C

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Classification Of Elements
    🎯Topic:Nitrogen Family [Group-15]
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Chemical Reactions, Stoichiometry, Chemical Nomenclature

    10.

    Which of the following is used to provide smoke screens :

    A

    Calcium phosphide

    B

    Zinc sulphate

    C

    Sodium carbonate

    D

    Zinc phosphide

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Classification Of Elements
    🎯Topic:Nitrogen Family [Group-15]
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Chemical properties of compounds, Smoke screen production

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