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D and F block elements Quiz-12

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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. Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionization enthalpy?
  •  Vanadium (Z=23)
  •  Chromium (Z=24)
  •  Iron (Z=26)
  •  Manganese (Z=25)
Solution
d
Q2.In alkaline H2O2,Cr2O72- changes to tetraperoxo species… having oxidation number of Cr as…
  •  CrO42- 6
  •  CrO5 6
  •  CrO83- 5
  •  CrO83- 11
Solution
c
Q3.  Elements after atomic number 92 are called
  •  Lanthanoids
  •  Actinoids
  •  Inner-transition elements
  •  Transuranium elements
Solution
d

Q4. The lanthanoid contraction is due to
  •  Filling of 4f before 4d
  •  Filling of 4d before 4f
  •  Filling of 4f before 5d
  •  Filling of 5d before 4f
Solution
c
Q5.Which of the following types of metals form the most efficient catalysts?
  •  Alkali metals
  •  Alkaline earth metals
  •  Transition metals
  •  All of the above
Solution
c
Q6. In reduction of dichromate by Fe(II), the number of electrons involved per chromium atom is
  •  2
  •  3
  • 4
  •  1
Solution
b
Q7.Which is the coloured ion
  •  [Cu(CN)4]3-
  •  [Sc(H2O)6]3+
  •  [Mn(H2O)6]3+
  •  All of these
Solution
c
Q8.The compound that get oxidized even on exposure to air is
  •  Fe2O3
  •  FeCl2
  •  FeCl3
  •  Fe2(SO4)3
Solution
b
Q9.If zinc pieces are added yellow FeCl3solution, it turns to very light green. It is because
  •  FeCl3solution is acidic due to hydrolysis and zinc added produces nascent hydrogen causing reduction of FeCl3to FeCl2
  •  FeCl3 solution is basic and zinc added produces H2 which reduces FeCl3to FeCl2
  •  Zinc reduces FeCl3 to FeCl2
  •  None of the above is correct
Solution
a
Q10. Mixture is supposed to contain nitrates of Pb2+and Hg22+. On adding dil. HCl both are precipitated as white precipitate Select the correct statement(s)
  •  PbCl2(white precipitate) is soluble in hot water and formation of yellow precipitate on adding KI to hot solution confirms Pb2+
  •  Hg2Cl2 is blackened by NH3, and change to HgCl2 by aqua-regia. HgCl2 can be detected by KI is formed
  •  Both tests are conclusive
  • None of the tests is conclusive
Solution
c

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