Chloroplatinate salts are very stable and do not decompose on heating.

Explanation

**Step-by-Step Solution:**

1. **Understanding Chloroplatinate Salts:**
Chloroplatinate salts contain the complex anion [PtCl6]²⁻. In this anion, platinum (Pt) is in the +4 oxidation state.

2. **Analyzing the Structure:**
The structure of [PtCl6]²⁻ is octahedral. This means that the platinum atom is at the center, surrounded by six chloride ions (Cl⁻) positioned at the corners of an octahedron.

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