THE D-AND F-BLOCK ELEMENTS Quiz-17

D and F block elements Quiz-17

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Q1. Out of [Fe(CN)₆]^4-,[Ni(CN)₄ ]^2- and [Ni(CO)₄]

•  All have identical geometry
•  All are paramagnetic
•  All are diamagnetic
•  [Fe(CN)₆]^4- is diamagnetic but [Ni(CN)₄]^2- and [Ni(CO)₄] are paramagnetic

Solution
c

Q2.Alkaline KMnO₄ (Baeyer’s reagent) can be used to test unsaturation in (A)

In this case

•  Unsaturation in side-chain is affected
•  Unsaturation in benzene nucleus is affected
•  Unsaturation in both is affected
•  Baeyer’s reagent cannot be used

Solution
a

Q3.  Increasing basic properties of TiO₂,ZrO₂ and HfO₂ are in order

•  TiO₂22

 HfO₂22

 HfO₂22

 ZrO₂22

Solution
a

Q4. Fulminating gold is

•  AuCl₃
•  Au₂ S
•  Au(NH₂)=NH
•  H[Au(Cl)₄]

Solution
c

Q5.The stability of ferric ion is due to

•  Half filled f-orbitals
•  Half filled d-orbitals
•  Completely filled f-orbitals
•  Completely filled d-orbitals

Solution
b

Q6. Cuprous ion is colourless while cupric ion is coloured because

•  Both have half-filled p-and d-orbitals
•  Both have unpaired electrons in d-orbitals
• Cuprous ion has incomplete d-orbital and cupric ion has a complete d-orbital
•  Cuprous ion as a complete d-orbital and cupric ion has an incomplete d-orbital

Solution
d

Q7.Select the correct statement for the lesser number of oxidations states in 3d-series

•  In the beginning of the series it can be due to the presence of too few electrons to loose or share

 Towards the end of the series, it can be ascribed to the presence of too many electrons and thus fewer empty orbitals to share electrons with the ligands

 Both (a) and (b) are correct

 None of the above is correct

Solution
c

Q8.The element which forms ions in dimeric state is

•  Iron
•  Mercury
•  Cadmium
 Nickel

Solution
b

Q9.The common oxidation state of the elements of lanthanide series is

•  +1
•  +3
•  +4
•   +6

Solution
b

Q10. At 300℃,FeCl₃

•  Decomposes into FeCl₂ and Cl₂
•  Decomposes into Fe and Cl₂
•  Sublimes to give liquid FeCl₃
• Sublimes to give gaseous dimer (FeCl₃)₂

Solution
d

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