D & F Block Elements
Q. What is the geometry of the complex ion [Cu(NH3)4]SO4?
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A.
Tetrahedral
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B.
Square planar
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C.
Octahedral
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D.
Trigonal bipyramidal
Solution
The geometry of [Cu(NH3)4]2+ is square planar due to the presence of a d9 configuration in copper.
Correct Answer: B — Square planar
Q. What is the IUPAC name of the compound [Cr(NH3)6]Cl3?
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A.
Hexaammonium chromium(III) chloride
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B.
Hexaammonia chromium(III) chloride
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C.
Hexaammine chromium(III) chloride
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D.
Hexaammonium chromium(II) chloride
Solution
The correct IUPAC name is Hexaammine chromium(III) chloride, where 'ammine' indicates the ammonia ligands and chromium is in the +3 oxidation state.
Correct Answer: C — Hexaammine chromium(III) chloride
Q. Which of the following compounds is a common oxidation state of iron?
Solution
Iron commonly exhibits oxidation states of +2 and +3, with +2 being the most stable in many compounds.
Correct Answer: C — +3
Q. Which of the following elements is a lanthanide?
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A.
Zirconium
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B.
Neodymium
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C.
Tantalum
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D.
Hafnium
Solution
Neodymium is a lanthanide, which are the 15 elements from cerium (Ce) to lutetium (Lu) in the periodic table.
Correct Answer: B — Neodymium
Q. Which of the following is a characteristic of f-block elements?
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A.
They are all radioactive
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B.
They have partially filled f-orbitals
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C.
They are all metals
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D.
They have low density
Solution
F-block elements have partially filled f-orbitals, which is a defining characteristic of these elements.
Correct Answer: B — They have partially filled f-orbitals
Q. Which of the following is a property of d-block elements?
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A.
Forming ionic bonds only
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B.
High melting and boiling points
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C.
Always being paramagnetic
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D.
Being non-metals
Solution
D-block elements typically have high melting and boiling points due to strong metallic bonding.
Correct Answer: B — High melting and boiling points
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