Chapter Exam

Chapter-4 The d- and f-Block Elements — Online MCQ Test

Q: Which of the following elements is NOT a transition metal?

Answer: D. Gallium (Ga) — Gallium (Ga) is a p-block element with configuration [Ar]3d¹⁰4s²4p¹. Transition metals have partially filled d-orbitals in their ground or common oxidation states; Zn, though having filled d-orbitals, is often considered a transition metal due to its position and properties.

Q: What is the general electronic configuration of d-block elements?

Answer: A. (n-1)d¹⁻¹⁰ ns¹⁻² — d-block elements have electrons filling the (n-1)d orbitals with configurations ranging from (n-1)d¹ to (n-1)d¹⁰ along with ns¹ or ns² electrons in the outermost shell.

Q: What is the oxidation state of Mn in the complex ion [MnO₄]⁻?

Answer: C. +7 — In [MnO₄]⁻, oxygen has oxidation state -2. With 4 oxygen atoms: total = -8. Since the ion has charge -1, Mn must be +7 (as +7 - 8 = -1).

Q: IUPAC nomenclature for [Co(NH₃)₅Cl]²⁺ would be:

Answer: B. Pentaamminechloridocobalt(III) ion — Following IUPAC rules: anions are named first (chlorido), then ligands in alphabetical order (pentaammine), then metal and oxidation state. Co³⁺ has d⁶ configuration. Charge: 5(0) + (-1) + Co = +2, so Co is +3.

CHEMISTRY · CLASS 12 INTER II YEAR · Andhra State Board

Practice Chapter-4 The d- and f-Block Elements with a free chapter-wise online MCQ test for Andhra State Board CLASS 12 INTER II YEAR CHEMISTRY. This chapter covers: transition elements - lanthanides - actinides - coordination compounds. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-4 The d- and f-Block Elements — Important Questions & Answers (FAQ)

Frequently asked questions from Andhra State Board CLASS 12 INTER II YEAR CHEMISTRY — Chapter-4 The d- and f-Block Elements, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following elements is NOT a transition metal?

A. Iron (Fe)
B. Copper (Cu)
C. Zinc (Zn)
D. Gallium (Ga) ✓

Answer: D. Gallium (Ga)
Gallium (Ga) is a p-block element with configuration [Ar]3d¹⁰4s²4p¹. Transition metals have partially filled d-orbitals in their ground or common oxidation states; Zn, though having filled d-orbitals, is often considered a transition metal due to its position and properties.

What is the general electronic configuration of d-block elements?

A. (n-1)d¹⁻¹⁰ ns¹⁻² ✓
B. (n-1)d⁰⁻¹⁰ ns¹⁻³
C. (n-2)d¹⁻¹⁰ ns¹⁻²
D. (n-1)d⁵⁻¹⁵ ns¹⁻²

Answer: A. (n-1)d¹⁻¹⁰ ns¹⁻²
d-block elements have electrons filling the (n-1)d orbitals with configurations ranging from (n-1)d¹ to (n-1)d¹⁰ along with ns¹ or ns² electrons in the outermost shell.

What is the oxidation state of Mn in the complex ion [MnO₄]⁻?

A. +5
B. +6
C. +7 ✓
D. +4

Answer: C. +7
In [MnO₄]⁻, oxygen has oxidation state -2. With 4 oxygen atoms: total = -8. Since the ion has charge -1, Mn must be +7 (as +7 - 8 = -1).

The magnetic moment of [Co(NH₃)₆]³⁺ complex is zero. This indicates:

A. Co is in +2 oxidation state
B. Co is in +3 oxidation state with all d-electrons paired ✓
C. Ammonia is a very weak field ligand
D. The complex is paramagnetic

Answer: B. Co is in +3 oxidation state with all d-electrons paired
In [Co(NH₃)₆]³⁺, Co³⁺ has d⁶ configuration. NH₃ is a strong field ligand causing complete pairing of all 6 electrons (t₂g⁶), resulting in zero magnetic moment.

IUPAC nomenclature for [Co(NH₃)₅Cl]²⁺ would be:

A. Pentaammineaminechloridocobalt(II) ion
B. Pentaamminechloridocobalt(III) ion ✓
C. Chloridopentaamminecobalt(II) ion
D. Amminepentachloridocobalt(III) complex

Answer: B. Pentaamminechloridocobalt(III) ion
Following IUPAC rules: anions are named first (chlorido), then ligands in alphabetical order (pentaammine), then metal and oxidation state. Co³⁺ has d⁶ configuration. Charge: 5(0) + (-1) + Co = +2, so Co is +3.