In `Cro_4^(2-)` ion, Cr is ............. hybridised.

Explanation

To determine the hybridization of chromium in the chromate ion \(\text{CrO}_4^{2-}\), we can follow these steps:

### Step 1: Determine the electronic configuration of chromium
Chromium (Cr) has an atomic number of 24. Its electronic configuration can be written as:
\[ \text{Cr: } [\text{Ar}] 3d^5 4s^1 \]
This means that chromium has 5 electrons in the 3d subshell and 1 electron in the 4s subshell.
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