THE D-AND F-BLOCK ELEMENTS Quiz-12

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,Cr₂O₇^2- changes to tetraperoxo species… having oxidation number of Cr as…

•  CrO₄^2- 6
•  CrO₅ 6
•  CrO₈^3- 5
•  CrO₈^3- 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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