D & F Block Elements
Q. What is the geometry of the complex ion [Cu(NH3)4]SO4?
A.
Tetrahedral
B.
Square planar
C.
Octahedral
D.
Trigonal bipyramidal
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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
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Q. What is the hybridization of the central atom in the complex [Ni(CO)4]?
A.
sp
B.
sp2
C.
sp3
D.
d2sp3
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Solution
In [Ni(CO)4], nickel undergoes sp3 hybridization to accommodate four CO ligands.
Correct Answer: C — sp3
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Q. What is the IUPAC name of the compound with the formula [Co(NH3)5Cl]Cl2?
A.
Pentaamminechlorocobalt(III) chloride
B.
Chloropentaamminecobalt(II) chloride
C.
Pentaamminecobalt(II) chloride
D.
Pentaamminechlorocobalt(II) chloride
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Solution
The complex has a cobalt ion in the +3 oxidation state, and the correct IUPAC name is Pentaamminechlorocobalt(III) chloride.
Correct Answer: A — Pentaamminechlorocobalt(III) chloride
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Q. What is the IUPAC name of the compound [Cr(NH3)6]Cl3?
A.
Hexaammonium chromium(III) chloride
B.
Hexaammonia chromium(III) chloride
C.
Hexaammine chromium(III) chloride
D.
Hexaammonium chromium(II) chloride
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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
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Q. What is the oxidation state of iron in the complex [Fe(CN)6]3-?
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Solution
In the complex [Fe(CN)6]3-, each cyanide (CN) has a charge of -1. Therefore, to balance the overall charge of -3, iron must be in the +3 oxidation state.
Correct Answer: B — +3
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Q. Which of the following compounds is a common oxidation state of iron?
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Solution
Iron commonly exhibits oxidation states of +2 and +3, with +2 being the most stable in many compounds.
Correct Answer: C — +3
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Q. Which of the following elements is a lanthanide?
A.
Zirconium
B.
Neodymium
C.
Tantalum
D.
Hafnium
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Solution
Neodymium is a lanthanide, which are the 15 elements from cerium (Ce) to lutetium (Lu) in the periodic table.
Correct Answer: B — Neodymium
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Q. Which of the following is a characteristic of f-block elements?
A.
They are all radioactive
B.
They have partially filled f-orbitals
C.
They are all metals
D.
They have low density
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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
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Q. Which of the following is a property of d-block elements?
A.
Forming ionic bonds only
B.
High melting and boiling points
C.
Always being paramagnetic
D.
Being non-metals
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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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