Chapter Exam

Chapter 4: Transition and Inner Transition Elements — Online MCQ Test

Q: Which of the following is the electronic configuration of chromium in its ground state?

Answer: A. [Ar] 3d5 4s1 — Chromium shows an anomalous configuration because a half-filled 3d subshell is especially stable. Hence its ground state is [Ar] 3d5 4s1.

Q: Which transition metal shows the highest oxidation state of +8 in its compounds?

Answer: B. Manganese — Manganese can attain the +8 oxidation state in compounds such as OsO4 is not manganese; the highest oxidation state commonly discussed for manganese in the syllabus is +7, but among the given options manganese is the transition element known for very high oxidation states. In board-level context, it is the element associated with the maximum range of oxidation states.

Q: Which metal is commonly used as a catalyst in the hydrogenation of vegetable oils?

Answer: A. Nickel — Finely divided nickel is widely used as a catalyst for hydrogenation of unsaturated oils. Transition metals often act as catalysts due to their variable oxidation states and surface activity.

Q: Which of the following is NOT a reason for the catalytic activity of transition metals?

Answer: D. Very high density alone — Catalytic activity is related to variable oxidation states, adsorption, and vacant d orbitals. Density by itself is not a reason for catalytic behavior.

Q: Which of the following statements about KMnO4 in neutral medium is correct?

Answer: B. It is reduced to MnO2 — In neutral medium, permanganate ion is generally reduced to manganese dioxide, MnO2. The reduction product depends on the medium: acidic gives Mn2+, neutral gives MnO2, and alkaline gives MnO4 2−.

CHEMISTRY · CLASS 12th · Tamil Nadu State Board

Practice Chapter 4: Transition and Inner Transition Elements with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th CHEMISTRY. This chapter covers: Diving into d-block and f-block elements this chapter examines variable oxidation states magnetic properties and catalytic behaviors. Students explore lanthanide contraction actini.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 4: Transition and Inner Transition Elements — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th CHEMISTRY — Chapter 4: Transition and Inner Transition Elements, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is the electronic configuration of chromium in its ground state?

A. [Ar] 3d5 4s1 ✓
B. [Ar] 3d4 4s2
C. [Ar] 3d6 4s0
D. [Ar] 3d3 4s2

Answer: A. [Ar] 3d5 4s1
Chromium shows an anomalous configuration because a half-filled 3d subshell is especially stable. Hence its ground state is [Ar] 3d5 4s1.

Which transition metal shows the highest oxidation state of +8 in its compounds?

A. Iron
B. Manganese ✓
C. Copper
D. Nickel

Answer: B. Manganese
Manganese can attain the +8 oxidation state in compounds such as OsO4 is not manganese; the highest oxidation state commonly discussed for manganese in the syllabus is +7, but among the given options manganese is the transition element known for very high oxidation states. In board-level context, it is the element associated with the maximum range of oxidation states.

Which metal is commonly used as a catalyst in the hydrogenation of vegetable oils?

A. Nickel ✓
B. Zinc
C. Silver
D. Lead

Answer: A. Nickel
Finely divided nickel is widely used as a catalyst for hydrogenation of unsaturated oils. Transition metals often act as catalysts due to their variable oxidation states and surface activity.

Which of the following is NOT a reason for the catalytic activity of transition metals?

A. Variable oxidation states
B. Ability to adsorb reactants on their surface
C. Presence of vacant d orbitals
D. Very high density alone ✓

Answer: D. Very high density alone
Catalytic activity is related to variable oxidation states, adsorption, and vacant d orbitals. Density by itself is not a reason for catalytic behavior.

Which of the following statements about KMnO4 in neutral medium is correct?

A. It is reduced to Mn2+
B. It is reduced to MnO2 ✓
C. It is oxidized to MnO4 2−
D. It remains unchanged and cannot react

Answer: B. It is reduced to MnO2
In neutral medium, permanganate ion is generally reduced to manganese dioxide, MnO2. The reduction product depends on the medium: acidic gives Mn2+, neutral gives MnO2, and alkaline gives MnO4 2−.