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The d- and f- Block Elements Test - 7

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The d- and f- Block Elements Test - 7
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  • Question 1
    1 / -0

    Lucas reagent is

    Solution

    Lucas test is done to distinguish between primary, secondary and tertiary alcohols. Lucas reagent is ZnCl2 + HCl.

  • Question 2
    1 / -0

    Vitamin B12 contains

    Solution

    Vitamin B12 is also referred to as cobalamin, because it contains a metal ion Co+3. This makes it the largest and most complex vitamin of all. The vitamin can only be synthesized by bacteria and therefore is mainly present in animal products.

  • Question 3
    1 / -0

    Which is least soluble in water?

    Solution

    Ag2S is least soluble in water. Its Ksp (solubilty product) in water is 6x10-51. Ksp value indicates how soluble a compound is.

  • Question 4
    1 / -0

    A reduction in the atomic size with increase in atomic number is characteristic of the elements of

    Solution

    In f-block elements with increase in atomic number, atomic radii decreases smoothly due to lanthanide contraction.

  • Question 5
    1 / -0

    Nitrous oxide is evolved when Zn is treated with

    Solution

    4Zn(s) + 10HNO3 (l) → 4Zn(NO3)2(s) + N2O(g) + 5H2O(l)

  • Question 6
    1 / -0

    Ferrous sulphate on heating gives

    Solution

    FeSO4 on heating decomposes to SO2 and SO3 along with solid Fe2O3 as given below:
    2FeSO4(s) →→ Fe2O3(s) + SO2(g)+ SO3(g)

  • Question 7
    1 / -0

    In the reaction, SnCl2 + HgCl2 → A + SnCl4, A is

    Solution

     

    Tin(II) chloride react with mercury(II) chloride in acidic medium to produce mercury and tin(IV) chloride as given below:
    SnCl2 + HgCl2 → Hg + SnCl4

  • Question 8
    1 / -0

    Ag+ ion is isoelectronic with

    Solution

    Atomic number of Ag is 47 with electronic configuration of [Kr] 4d10 5s1 whereas for Cd, atomic number is 48 and electronic configuration is [Kr] 4d10 5s2. Ag+ is isoelectronic with Cd2+, since electronic configuration of both of them is [Kr] 4d10.

  • Question 9
    1 / -0

    The compound which is widely used as a white pigment is

    Solution

    ZnO is white in color. This is because Zn is in +2 oxidation state with d10 system having no unpaired electrons and hence absence of d-d transition.

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