Chapter 4: Transition and Inner Transition Elements — Online MCQ Test
CHEMISTRY · CLASS 12th · Tamil Nadu State Board
Practice Chapter 4: Transition and Inner Transition Elements with a free chapter-wise online MCQ test.
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....
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Chapter 4: Transition and Inner Transition Elements — Important Questions & Answers
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.
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.
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.
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.
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−.
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−.