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D and F - Block Elements Test - 5

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D and F - Block Elements Test - 5
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Weekly Quiz Competition
  • Question 1
    4 / -1

    Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?

    Solution

    (n - 1) d5ns2 attains the maximum oxidation state of+ 7.

  • Question 2
    4 / -1

    Among the following series of transition metal ions, the one where all metal ions have 3d2 electronic configuration is (Atomic number, Ti = 22, V = 23, Cr = 24, Mn = 25) 

    [AIEEE 2004]

    Solution

    Ti2+,V3+,Cr4+ and Mn5+ show 1s22s22p63s23p64s03d2 electronic configuration.

  • Question 3
    4 / -1

    For the four successive transition elements (Cr, Mn, Fe and Co), the stability of + 2 oxidation state will be there in which of the following order?

    Solution

    Mn2+ (d5) > Cr2+ (d4) > Fe2+ (d6) > Co2+ (d7) Mn2+ is more stable due to half-filled configuration, i . e . d5.

  • Question 4
    4 / -1

    The catalytic activity of transition metals and their compounds is mainly due to

    Solution

    The variability of oxidation state, a characteristic of transition element arises due to incomplete filling of d-orbitals.

  • Question 5
    4 / -1

    Many copper (I) compounds are unstable in aqueous solution and undergo disproportionation as 2Cu+ → Cu + Cu2+ . This is due to

    Solution

    Cu (I) undergoes spontaneous disproportionation.

    hus, ΔG is negative (spontaneous) for disproportionation.

  • Question 6
    4 / -1

    Gun metal is an alloy of

    Solution

    Gun metal is an alloy of Cu, Zn and Sn. It contains 88% Cu 10% Sn and 2% Zn.

  • Question 7
    4 / -1

    In which of the following pairs both the ions are coloured in aqueous solution? (Atomic number, Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

    Solution

    Ni2+ and Ti3+ ions are coloured in aqueous solution because they contain unpaired electrons.

  • Question 8
    4 / -1

    [Ti (H2O)6]3+ absorbs green and yellow region part of visible light. Then the transmitted colour of the compound is

    Solution

    We know that white light is composed of many different colours. When white light is allowed to fall on [Ti(H2O)6]3+ ion, this ion absorbs the light of green and yellow colour and transmits is almost purple colour.The purple colour of the transmitted light is called complimentary colour of that of absorbed light.

  • Question 9
    4 / -1

    Compound of metal ion MX+(Z = 26) has a spin only magnetic moment of   BM The number of unpaired electrons and x value in the compound are

    Solution

    Metal ion is Fe3+ which have 5 unpaired electrons.

  • Question 10
    4 / -1

    In which of the following the stability of two oxidation states is correctly represented?

    Solution

    Mn2+ (d5) is more stable than Mn3+(d4) because Mn2+ have half-filled configuration.

  • Question 11
    4 / -1

    According to IUPAC nomenclature sodium nitroprusside dihydrate is named as

  • Question 12
    4 / -1

    In Fe(CO)5, the Fe-C bond possesses:

  • Question 13
    4 / -1

     Paramagnetic Curie temperature in Kelvin for iron is equal to :

    Solution

    Paramagnetic Curie temperature for iron is equal to 1095 Kelvin. Relative permeability is greater than 1 for paramagnetic material.

  • Question 14
    4 / -1

     

    +8 oxidation state is/are shown by

     

    Solution

    +8 oxidation state shown by Ru.

  • Question 15
    4 / -1

    The pair that has similar atomic radii is

  • Question 16
    4 / -1

    Comprehension Type

    Direction (Q, Nos. 16 and 17) This section contains a paragraph, describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

    Passage

    Transition metals and their compounds have paramagnetic properties due to the presence of unpaired electrons in (n - 1)d-orbitals. The paramagnetic behaviour is expressed in terms of magnetic moment which is because of the spin of the unpaired electrons (n). It is given as
    Magnetic moment =   
    Majority of transition metal compounds are coloured both in solid state as well as in aqueous solution. This is also due to the presence of unpaired electrons in (n - 1) d-orbitals, d-orbitals splitting and d-d transition of electrons absorbing suitable visible light.

    Q. 

    Which of the following exhibit colour due to charge transfer phenomenon, but not due to d-d transition?

    Solution

    In transition metal complexes, a change in electron distribution between the metal and a ligand give rise to charge transfer bonds.
    Here, charge transfer may occur from the ligand molecular orbitals to the empty or partially filled metal d-orbitals.

  • Question 17
    4 / -1

    Transition metals and their compounds have paramagnetic properties due to the presence of unpaired electrons in (n - 1)d-orbitals. The paramagnetic behaviour is expressed in terms of magnetic moment which is because of the spin of the unpaired electrons (n). It is given as
    Magnetic moment =   
    Majority of transition metal compounds are coloured both in solid state as well as in aqueous solution. This is also due to the presence of unpaired electrons in (n - 1) d-orbitals, d-orbitals splitting and d-d transition of electrons absorbing suitable visible light.

    Q. 

    Which pair of ions are expected to be diamagnetic?

    Solution

    Ag+ (d10) and Au+(d10) are diamagnetic due to absence of unpaired number of electrons.

  • Question 18
    4 / -1

    Matching List Type

    Direction (Q. No. 18-20) Choices fo r the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

    Q. 

    Match the Column I with Column II and mark the correct option from the given codes.

    Solution

    (i) → (s),(ii) → (p),(iii) → (q) (iv) → (r)

  • Question 19
    4 / -1

    Match the Column I with Column II and mark the correct option from the given codes.

    Solution

    (i) → (s), (ii) → (s), (iii) → (p),(iv) → (q)

  • Question 20
    4 / -1

    Match the Column I with Column II and mark the correct option from the given codes.

    Solution

    Fenton’s reagent (Fe SO4 + H2O2) is used for oxidising alcohol to aldehyde. Zeigler-Natta catalyst [AI(C2H5)3 + TiCI4] is used for manufacture of polythene.
    (i) → (Q). (ii) → (r), (iii) → (s), (iv) → (p)

  • Question 21
    4 / -1

     

    One Integer Value Correct Type

    Direction (Q. Nos. 21-24) This section contains 4 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

    Q. 

    Number of alloys that contain nickel among the following solder, gun metal, German silver, nichrome, monel metal, constanton, bell metal, duralumin, type metal, invar, alnico.

     

    Solution

    German silver (Cu + Zn + Ni), nichrome (Ni 60% + Cr 20% + Fe), monel metal (Cu + Ni 66%), constanton (Cu + Ni), invar (Fe + Ni), alnico (Al + Ni + Co + Cu).

     

  • Question 22
    4 / -1

     

    Green vitriol is FeSO4.xH2O and white vitriol is ZnSO4.yH2O, Then, the values of x and y are

     

    Solution

    In both, xand y value is 7.

  • Question 23
    4 / -1

     

    Oxidation state of chromium in CrO5 is +x. Here, value of x is

     

    Solution

    4 oxygen atoms attached by peroxide linkage. So, their oxidation states are taken as -1.
    Now, let the oxidation state of Cr be x.
    then x + 4 x (-1) - 2 = 0
    x = 6 

  • Question 24
    4 / -1

     

    Number of compounds in which metal has zero oxidation state

    WO3,Ni(CO)4, MoO3, Fe(CO)5, Cr(CO)6, [Pt(NH3)2CI2], Co2(CO)8 and Mn2(CO)10

     

    Solution

    In metal carbonyls, metal oxidation state is zero.

     

  • Question 25
    4 / -1

    Statement l : ,Cu2O and Ni-DMG complex are coloured.

    Statement II : It is due to charge transfer transition.

    Solution

    Colours of ,Cu2O and Ni-DMG complex are due to charge transfer transition.
    (iv) Sodium sulphite is a reducing agent. It reduces acidified K2CrO7 to chromic sulphate which is green in colour.

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