Give below are two statements: Statement I: The higher oxidation states are more stable down the group among transition…
d & f-Block Elements · Class 12 · JEE Main Previous Year Question
Give below are two statements:
Statement I: The higher oxidation states are more stable down the group among transition elements unlike p-block elements. Statement II: Copper can not liberate hydrogen from weak acids.
In the light of the above statements, choose the correct answer from the options given below:
- a✓
Both Statement I and Statement II are true
- b
Statement I is false but Statement II is true
- c
Both Statement I and Statement II are false
- d
Statement I is true but Statement II is false
Both Statement I and Statement II are true
Statement I: Higher oxidation states more stable down the group in transition metals
This is TRUE ✓
In d-block, going down a group (e.g., Fe → Ru → Os), higher oxidation states become more stable:
- Fe: +2, +3 common; +6 (FeO₄²⁻) rare
- Ru: +4, +6, +8 common
- Os: +8 (OsO₄) very stable
This is opposite to p-block where lower oxidation states are more stable down the group (inert pair effect).
Statement II: Cu cannot liberate H₂ from weak acids
This is TRUE ✓
Cu has V (positive), so it lies below H in the electrochemical series. Cu cannot displace H₂ from any acid (weak or strong dilute acids).
Both statements are true.
Answer: Option (1)
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