JEE Questions for Chemistry The D And F Block Elements Quiz 4 - MCQExams.com

Which of the following pairs of elements cannot form an alloy ?
  • Zn, Cu
  • Fe, Hg
  • Fe, C
  • Hg, Na
Which of the following types of metals form the most efficient catalysts ?
  • Alkali metals
  • Alkaline earth metals
  • Transition metals
  • All of these
Effective magnetic moment of Sc 3+ ion is
  • 1.73
  • 0
  • 5.92
  • 2.83
  • 3.87
Mohr salt is made up of which combination of salt ?
  • Ammonium sulphate and potash
  • Ammonium sulphate and ferrous sulphate
  • Ammonium sulphate and copper sulphate
  • Ammonium sulphate and magnesium sulphate
KMnO4 in basic medium is reduced to
  • K2MnO4
  • MnO2
  • Mn(OH)2
  • Mn 2+
Number of electrons in 3d-orbital of V 2+ , Cr 2+ , Mn 2+ and Fe2+ are 3, 4, 5, and 6 respectively. Which of the following ions will have largest value of magnetic moment (μ)?
  • V2+
  • Cr2+
  • Mn2+
  • Fe2+
Railway wagon axles are made by heating iron rods embedded in charcoal powder. This process is known as
  • tempering
  • case hardening
  • sherardising
  • annealing
The form of iron having the highest carbon content is
  • cast iron
  • wrought iron
  • stainless steel
  • mild steel
CrO3 dissolves in aqueous NaOH to give

  • Chemistry-The d and f Block Elements-8391.png
  • 2)
    Chemistry-The d and f Block Elements-8392.png

  • Chemistry-The d and f Block Elements-8393.png

  • Chemistry-The d and f Block Elements-8394.png
Brass, bronze and German silver have one common metal. This is
  • Zn
  • Fe
  • Al
  • Cu
Zn does not show variable valency because of
  • complete d-subshell
  • inert pair effect
  • 4s2-subshell
  • None of these
An f-shell containing 6 unpaired electrons can exchange
  • 6 electrons
  • 9 electrons
  • 12 electrons
  • 15 electrons
Due to lanthanide contraction
  • Fe, Co, Ni have equal size
  • Zr and Hf have equal size
  • all f-block ions have equal size
  • all isoelectric ions have equal size
The lanthanoid which exhibits + 4 oxidation
  • Pm
  • Sm
  • Ce
  • Gd
What elements are present in f-block series?
  • Lanthanoids
  • Actinoids
  • Lanthanoids and actinoids
  • Lipids
What are lanthanides and actinides?
  • Inner-transition element
  • Noble gas
  • Normal element
  • Transition element
In context of the lanthanoids, which of the following statements is not correct ?
  • There is a gradual decrease in the radius of the members with increasing atomic number in the series
  • All the members exhibit +3 oxidation state
  • Because of similar properties the separation of lanthanoids is not easy
  • Availability of 4f-electrons results in the formation of compounds in + 4 state for all members of the series
Which lanthanide compound is used as a pigment?
  • CeO2
  • Ce(OH)3
  • Lu(OH)3
  • Tb(OH)3
The point of dissimilarity between lanthanides and actinides is
  • three outermost shells are partially filled
  • they show oxidation state of + 3 (common)
  • they are called inner-transition elements
  • their are radioactive in nature
Most common oxidation states of Ce (cerium) are
  • +3, +4
  • +2, +3
  • +2, +4
  • +3, +5
The most stable oxidation state of lanthanides is
  • + 2
  • + 4
  • 0
  • + 3
Which of the following has got incompletely filled f-subshell '?
  • Gadolinium
  • Lutetium
  • Lawrencium
  • Tantalum
Lanthanide contraction is due to increase in
  • shielding by 4f-electrons
  • atomic number
  • effective nuclear charge
  • size of 4f-orbitals
Identify the incorrect statement among the following.
  • d-block elements show irregular and erratic chemical properties among themselves
  • La and Lu have partially filled d-orbitals and no other partially filled orbital
  • The chemistry of various lanthanoids is very similar
  • 4f and 5f-orbitals are equally shielded
The actinoides exhibit more number of oxidation states in general than the lanthanoides. This is because
  • the 5f-orbitals are more buried than the 4f-orbitals
  • there is a similarity between 4f and 5f-orbitals in their angular part of the wave function
  • the actinoids are more reactive than the lanthanoids
  • the 5f-orbitals extend further from the nucleus than the 4f-orbitals
The lanthanide contraction is responsible for the fact that
  • Zr and Zn have the same oxidation state
  • Zr and Hf have about the same radius
  • Zr and Nb have similar oxidation state
  • Zr and Y have about the same radius
Which one of the following exist in the oxidation state other than +3 ?
  • B
  • Al
  • Ce
  • Ga
Which one of the following ions has same number of unpaired electrons as those present in V 3+ ion?
  • Fe3+
  • Ni2+
  • Mn2+
  • Cr3+
Irons exhibits + 2 and + 3 oxidation states. Which of the following statements about iron is incorrect?
  • Ferrous oxide is more basic in nature than the ferric oxide
  • Ferrous compounds are relatively more ionic than the corresponding ferric compounds
  • Ferrous compounds are less volatile than the corresponding ferric compounds
  • Ferrous compounds are more easily hydrolysed than the corresponding ferric compounds
The bonds present in the structure of dichromate ion are
  • four equivalent Cr—O bonds only
  • six equivalent Cr—O bonds and one O—O bond
  • six equivalent Cr—O bonds and one Cr—Cr bond
  • eight equivalent Cr—O bonds
  • six equivalent Cr—O bonds and one Cr—O—Cr bond
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