JEE Questions for Chemistry The D And F Block Elements Quiz 5 - MCQExams.com

When dil. H2 SO4 is added to aqueous solution of potassium chromate, yellow colour of solution turns to orange colour. It indicates
  • chromate ions are reduced
  • chromate ions are oxidised
  • monocentric complex is converted into dicentric complex
  • oxygen gets removed from chromate ions

Chemistry-The d and f Block Elements-8397.png
  • Mn > Cr > Fe > Co
  • Cr > Fe > Mn > Co
  • Fe > Mn > Cr > Co
  • Cr > Mn > Fe > Co
Which of the following is correct ?
  • Duralumin : Al + Cu + Mg + Ag
  • German silver : Cu + Zn + C
  • Gun metal : Cu + Zn + Sn
  • Solder : Pb + Al
A transition element X has the configuration [Ar ] d 4 in its + 3 oxidation state. Its atomic number is
  • 25
  • 26
  • 22
  • 19
The oxidation number of Mn in the product of alkaline oxidative fusion of MnO2 is
  • 2
  • 3
  • 4
  • 6
In context with the transition elements, which of the following statement is incorrect ?
  • In addition to the normal oxidation state, the zero oxidation state is also shown by these elements in complexes
  • In the highest oxidation state, the transition metal shows basic character and form cationic complexes
  • In the highest oxidation state of the first five transition elements (Sc to Mn), all the 4s and 4d electrons are used for bonding
  • Once the d5 configuration is exceeded, the tendency to involve all the 3d electrons in bonding decreases

Chemistry-The d and f Block Elements-8400.png
  • 4 and 2
  • 5 and 3
  • 3 and 2
  • 4 and 3
  • 3 and 1
Atomic radius of Ti, Zr and Hf vary
  • Ti > Zr > Hf
  • Ti < Zr < Hf
  • Ti < Hf < Zr
  • Ti < Zr = HF

Chemistry-The d and f Block Elements-8401.png
  • 2.84
  • 4.90
  • 0
  • 1.73
Match the following Columns.
Chemistry-The d and f Block Elements-8403.png
  • A = 1, B = 3, C = 5, D = 4
  • A = 2, B = 3, C = 5, D = 1
  • A = 4, B = 3, C = 5, D = 1
  • A = 4, B = 5, C = 3, D = 1
  • A = 5, B = 1, C = 2, D = 3
Which of the following is the green coloured powder produced when ammonium dichromate is used in fire works ?
  • Cr
  • CrO3
  • Cr2O3
  • CrO(O2)
The correct statement is
  • the earlier members of lanthanoid series resemble calcium in their chemical properties
  • the extent of actinoid contraction is almost the same as lanthanoid contraction
  • in general, lanthanoid and actinoids do not show variable oxidation states
  • Ce4+ in aqueous solution is not known
Knowing that the chemistry of lanthanoids (Ln) is dominated by its + 3 oxidation state, which of the following statements is incorrect ?
  • Because of the large size of the Ln (III) ions its compounds is predominantly ionic in character
  • The ionic sizes of Ln (III) decrease in general with increasing atomic number
  • Ln (III) compounds are generally colourless
  • Ln (III) hydroxide are mainly basic in character
Larger number of oxidation states are exhibited by the actinides than those by the lanthanides, the main reason being
  • 4f-orbitals more diffused than the 5f-orbitals
  • lesser energy difference between 5f and 6d than between 4f and 5d-orbitals
  • more energy difference between 5f and 6d than between 4f and 5d-orbitals
  • more reactive nature of the actinoides than the lanthanides
Lanthanides are
  • 14 elements in the sixth period (atomic number = 90 tothat are filling 4f -sublevel
  • 14 elements in the seventh period (atomic number = 90 tothat are filling 5f -sublevel
  • 14 elements in the sixth period (atomic number = 58 tothat are filling 4f -sublevel
  • 14 elements in the seventh period (atomic number = 58 tothat are filling 4f -sublevel
Cerium (Z=is an important member of the lanthanides. Which of the following statements about cerium is incorrect ?
  • The common oxidation states of cerium are + 3 and +4
  • The + 3 oxidation state of cerium is more stable than the + 4 oxidation state
  • The + 4 oxidation state of cerium is not known in solutions
  • Cerium (IV) acts as an oxidising agent
When calomel reacts with NH4OH solution, the compound formed is
  • NH2 —Hg —Cl
  • Hg2 Cl2 NH3
  • Hg(NH3)2 Cl2
  • HgCl2 NH3
Which of the following elements is alloyed with copper to form brasses ?
  • Lead
  • Bismuth
  • Zinc
  • Antimony
Cinnabar is an ore of
  • Hg
  • Cu
  • Pb
  • Zn
Calomel is
  • Hg2Cl2 and Hg
  • Hg2Cl2
  • Hg + HgCl2
  • HgCl2
Which of the following properties would you not expect copper (Cu) to exhibit?
  • High thermal conductivity
  • Low electrical conductivity
  • Ductility
  • Malleability
Blister copper is
  • Ore of Cu
  • Pure Cu
  • Alloy of Cu
  • Cu containing 1% impurity
Parke’s process is used in the extraction of
  • Iron
  • Zinc
  • Silver
  • Sodium
Galvanization is the
  • Deposition of zinc on Fe
  • Deposition of Al on Fe
  • Deposition of tin on Fe
  • Deposition of Cu on Fe
Photographic films and plates have an essential ingredient of
  • Silver nitrate
  • Silver bromide
  • Sodium chloride
  • Oleic acid
Which of the following dissolves in hot conc. NaOH?
  • Fe
  • Zn
  • Cu
  • Ag
Purest form of iron is
  • White cast iron
  • Grey cast iron
  • Wrought iron
  • Steel
In the metallurgy of iron, when limestone is added to the blast furnace, the calcium ion ends up in
  • Slag
  • Gangue
  • Metallic calcium
  • Calcium carbonate
The silver compound that is least soluble in water is
  • AgCl
  • Ag2S
  • AgF
  • AgBr
Duraluminium is an alloy which contains
  • Mg + Al
  • Mg + Cu + Al + Mn
  • Mg + Cu
  • Cu + Al
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