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d and f-Block Elements Test - 9
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d and f-Block Elements Test - 9
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  • Question 1/8
    1 / -0

    The number of water of crystallization in hydrated copper sulphate is

    Solutions

    Four molecules of H2O are present as ligands and there is one as water of crystallization.

     

  • Question 2/8
    1 / -0

    Transition elements form coordination complexes because of

    Solutions

    Transition elements form coordination complexes because of small size of metal ion, high charge density and availability of empty d-orbitals.

     

  • Question 3/8
    1 / -0

    The chromium atoms in both Cr2O72- and CrO42- are sp3 hybridised. All the Cr-O bonds are equivalent in

    Solutions

    In the dichromate ion, the two Cr-O bonds that share an oxygen at the common vertex of the two tetrahedral units have the bond length of 179 pm, whereas the other Cr-O bonds have the bond length of 163 pm.

     

  • Question 4/8
    1 / -0

    Which of the following oxides is amphoteric?

    Solutions

    The oxides with the metal atom in lower oxidation states (+2 and +3) are basic. Cr2O3 is an exception and is amphoteric. The oxides with the higher oxidation state of the metal are generally acidic.

     

  • Question 5/8
    1 / -0

    Which two lanthanoids are added as light filters to glass filter goggles?

    Solutions

    Praseodymium and Neodymium absorb yellow light when added to glass.

     

  • Question 6/8
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    Lanthanoids are soft metals with a silvery white sheen. The exception to this fact is

    Solutions

    Samarium is steel hard.

     

  • Question 7/8
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    K2Cr2O7 reacts with NH4Cl in the presence of H2SO4. The product formed is

    Solutions

    K2Cr2O7, when heated with conc. H2SO4, gives soluble chlorides of chromyl with deep red vapour.

     

  • Question 8/8
    1 / -0

    The relative composition of lanthanides in mischmetal is

    Solutions

    Mischmetal or mixed metal is an alloy of rare earth elements. It is also called cerium mischmetal, rare earth mischmetal. A typical composition includes approximately 50% cerium and 25% lanthanum, with small amounts of neodymium and praseodymium.

     

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