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D and F - Block Elements Test - 10

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D and F - Block Elements Test - 10
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  • Question 1
    4 / -1

    (T) imparts violet colour (V) Red gas (W) Red ppt.

    (W) Red ppt.  white ppt.

    (U)  gas (gives white fumes with HCl)

    sublimes on heating Identify (T) to (Z).

    Solution

    The correct answer is option B

  • Question 2
    4 / -1

    The number of moles of acidified KMnO4 required to convert one mole of sulphite ion into sulphate ion is-

    Solution

  • Question 3
    4 / -1

    N2(g) + 3H2 (g)  2NH3(g) ; Haber's process, Mo is used as -

    Solution

    MO is catalytic promoter & it improves catalytic properties as catalyst

  • Question 4
    4 / -1

     

    The element with atomic number 62 belongs

     

    Solution

     

    Samarium (Sm) (Z = 62) belongs to III B group and 6th period.

     

     

  • Question 5
    4 / -1

    Cr2O72-  2CrO42-, X and Y are respectively-

    Solution

  • Question 6
    4 / -1

     

    The radius of lanthanum is 1.06 Å. Then which of the following is closest to the radius of Lu3+ ion

     

    Solution

     

    Due to lanthanoid contraction.

     

  • Question 7
    4 / -1

     

    + 4 ion of which has half-filled 4f subshell

     

    Solution

     

    Tb (Z = 65) have [Xe] 4f95d06s2 configuration. Tb4+ have half-filled 4f subshell, i.e. 4f7.

     

     

  • Question 8
    4 / -1

    CrO3 dissolves in aqueous NaOH to give-

    Solution

  • Question 9
    4 / -1

     

    Lanthanide for which + II and + III oxidation states are common is

     

    Solution

     

    Europium (Eu) has [Xe] 4f75d06s2 configuration. The oxidation state of + 2 and + 3 are exhibited by these elements, e.g. Eu2+ is[Xe] 4f7and Eu3+ is [Xe]4f6.

     

  • Question 10
    4 / -1

    An ornament of gold having 75% of gold, it is of .............. carat.

    Solution

    100% – 24 carat

  • Question 11
    4 / -1

    Solution of MnO4- is purple-coloured due to-

    Solution

    MnO4– has purple colour due to change transfer

  • Question 12
    4 / -1

     

    An alloy of lanthanide

    Solution

     

    Misch metal is lanthanide metal (95%) and iron (5%) and traces of S, C, Ca, Al.

     

  • Question 13
    4 / -1

    Transition elements having more tendency to form complex than representative elements (s and p-block elements) due to-

    Solution

    Complex pormation α (Zeff = Z –σ) tendency

  • Question 14
    4 / -1

    During estimation of oxalic acid Vs KMnO4, self indicator is-

    Solution

    KMnO4 acts as self indicator.

  • Question 15
    4 / -1

     

    The metal(s) which does/do not form amalgam is/are-

     

    Solution

     

     

    Fe Refer metallurgy

     

     

  • Question 16
    4 / -1

     

    Across the lanthanide series, the basicity of the lanthanide hydroxides

     

    Solution

     

    The basicity decreases from Ce(OH)3 to Lu(OH)3. Due to lanthanide contraction, the decrease in the size of the cation increases the covalent character between the lanthanide ion and hydroxide ion thereby, reducing the basic character of the lanthanide hydroxide.

     

     

  • Question 17
    4 / -1

     

    Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

     

    Solution

     

    Gadolinium (Gd) have [Xe] 4f75d16s2 configuration.

     

  • Question 18
    4 / -1

     

    Lanthanides contraction causes

     

    Solution

     

    Electronegativity increases as we move from left to right due to lanthanide contraction.

     

  • Question 19
    4 / -1

    A compound of mercury used in cosmetics, in Ayurvedic and Yunani medicines and known as Vermilon is-

    Solution

    Vermilon cantain floulsmelly HgS.

  • Question 20
    4 / -1

    Acidified chromic acid

    X and Y are - (blue colour)

    Solution


  • Question 21
    4 / -1

    X(Blue colour ),X and Y are

    Solution


    CuSO4 + dilH2SO4 → [Cu(H2O)4]SO4

  • Question 22
    4 / -1

    Transition elements are usually characterised by variable oxidation states but Zn does not show this property because of-

    Solution

    Fully pilled d-subshell
    Zn →Zn2+ + 2e- 
    3d104s2 3d10

  • Question 23
    4 / -1

    (NH4)2Cr2O7 (Ammonium dichromate) is used in fire works. The green coloured powder blown in air is-

    Solution

  • Question 24
    4 / -1

    The d-block element which is a liquid at room temperature, having high specific heat, less reactivity than hydrogen and its chloride (MX2) is volatile on heating is-

    Solution

    HgCl2 is volatile is reffered as corrosive sublimate.

  • Question 25
    4 / -1

    Coinage metals show the properties of-

    Solution

    Cu, Ag, Au, are coinage metal used in coin in older days.

  • Question 26
    4 / -1

    Iron becomes passive by..................due to formation of ................

    Solution

    Fe + HNO3 → Fe2O3 + NO2 + H2O    
    80%

  • Question 27
    4 / -1

    Bayer's reagent used to detect olifinic double bond is-

    Solution

    Cold dilute alkaline KMnO4 is Bayer’s neagent.

  • Question 28
    4 / -1

     

    Which one of the following is a diamagnetic ion?

     

    Solution

     

    Co+2 = [Ar] 3d7
    Cu2+ = [Ar] 3d9
    Mn+2 = [Ar] 3d5
    Sc+3 = [Ar]
    We can see that only Sc+3  has no unpaired electron, so it is a diamagnetic ion.

     

  • Question 29
    4 / -1

     

    The inner transition elements are the elements in which the added electrons go to:

     

    Solution

     

    The inner transition elements are the elements in which the added electrons go to (n-2) f-orbitals. These include lanthanoids and actinoids. In lanthanoids, the added electron goes to 4f orbital and in actinoids, the added electron goes to 5f orbital.

     

  • Question 30
    4 / -1

     

    The second series of transition element starts with:

     

    Solution

     

    The second series includes the elements yttrium (symbol Y, atomic number 39) to cadmium(symbol Cd, atomic number 48).

     

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