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D and F block elements Quiz-14

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IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies. Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

Q1. Only +2, +3, +4 oxidation states are shown by
  •  Sc,Ti
  •  Fe,Ni
  •  Ti,Ni
  •  Zn,Ni
Solution
c
Q2.Pyrolusite in MnO2 is used to prepare KMnO4. Steps are
I and II are
  •  Fuse with KOH/air, electrolytic oxidation
  •  Fuse with KOH/air, electrolytic reduction
  •  Fuse with conc HNO3/air, electrolytic reduction
  •  All the above are correct
Solution
a
Q3.  The radii of the elements from chromium (Z=24) to copper (Z=29) are very close to one another. This is due to
  •  Lanthanide contraction
  •  The fact that successive addition of d-electrons screen the outer electrons (4s) from the inward pull of the nucleus
  •  Increase in radii due to increase in n is compensated by decrease in radii due to increase in Z
  •  Atomic radii do not remain constant but decrease in a normal gradation
  • Solution
    b

    Q4. Guigret’s green is
    •  NiO∙2H2O
    •  Cr2O3∙2H2O
    •  CuSO4∙2H2O
    •  CrO∙2H2O
    Solution
    b
    Q5.Which of the following pair of element cannot form an alloy?
    •  Zn,Cu
    •  Fe,Hg
    •  Fe, C
    •  Hg, Na
    Solution
    b
    Q6. Magnetic moment of [Ni(CN)4]2- is zero but that of [Ni(H2O)4]2+ is 2.83 BM It is because of
    •  Different oxidation state of Ni in two complexes
    •  CN- is a strong ligand making two unpaired electrons in Ni2+ paired while in [Ni(H2O)4]2+, two electrons remain unpaired H2O being weak ligand
    • Both (a) and (b)
    •  None of the above
    Solution
    b
    Q7.The mercury is the only metal which is liquid at 0℃. This is due to its
    •  Weak metallic bond
  •  High ionization energy
  •  High vapour pressure
  •  Both (a) and (b)
  • Solution
    a
    Q8.Consider the following statement I. The size the lanthanide M3+ ions decreases as the atomic number of M increase II. Electronic spectra of lanthanides show very broad bands III. As with transition metals, coordination number six is very common in lanthanide complexes Which of the statements given above is/are correct?
    •  I only
    •  I and II
    •  I and III
    •  III only
    Solution
    b
    Q9.Which shows maximum magnetic moment among the bivalent ions of the first transition series?
    •  Fe2+
    •  Co2+
    •  Ni2+
    •  Mn2+
    Solution
    d
    Q10. There are three electrons unpaired in [Co(H2O)6]2+and calculated value of magnetic moment is 3.87 BM which is quite different from the experimental value of 4.40 BM. This is because of
    •  Increase in number of unpaired electrons
    •  Some contribution of the orbital motion of the electron to the magnetic moment
    •  Change in orbital spin of the electron
    • d-d* transition
    Solution
    b

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