In chromyl chloride, the number of d-electrons present on chromium is same as in: (Given at. no. of Ti: 22, V: 23, Cr:…
d & f-Block Elements · Class 12 · JEE Main Previous Year Question
In chromyl chloride, the number of d-electrons present on chromium is same as in:
(Given at. no. of Ti: 22, V: 23, Cr: 24, Mn: 25, Fe: 26)
- a
V(IV)
- b✓
Mn(VII)
- c
Fe(III)
- d
Ti(III)
Mn(VII)
Step 1: d-electrons in Cr in chromyl chloride ()
Cr is in +6 state in .
Cr (Z=24) ground state: : remove all 6 valence electrons →
d-electrons in Cr(VI) = 0
Step 2: Find which option also has 0 d-electrons
| Species | Config | d-electrons | |---------|--------|-------------| | V(IV) = V⁴⁺ | | 1 ✗ | | Mn(VII) = Mn⁷⁺ | | 0 ✓ | | Fe(III) = Fe³⁺ | | 5 ✗ | | Ti(III) = Ti³⁺ | | 1 ✗ |
Mn (Z=25): → : remove all 7 valence electrons →
Answer: Option (2) — Mn(VII)
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