Geo-Scientist Prelims 2025 Chemistry Q8: Which of the following statements are correct ?

Which of the following statements are correct ?

1. The ionic radii of a metal ion in a given oxidation state are always a constant.
2. If a metal can form cations of different oxidation states, then for a given coordination number its ionic radius increases with increasing oxidation state.
3. If a metal can form cations of different oxidation states, then for a given coordination number its ionic radius decreases with increasing oxidation state.
4. The ionic radii of a metal ion in a given oxidation state increase with an increase in coordination number.

Select the answer using the code given below :

1. (a) 1 and 2
2. (b) 2 and 4
3. (c) 3 and 4
4. (d) 1 and 3