Q22 · CSIR-NET Chemistry, June 2016

Paper: CSIR-NET June 2016 · Subject: Inorganic Chemistry · Chapter: Analytical Chemistry · Topic: Analytical Chemistry – General · Marks: 2 · Difficulty: Medium

Decomposition temperature of $\mathrm{CaCO}_{3}$ in thermogravimetric analysis will be highest in dynamic atmosphere of:
(a)nitrogen
(b)synthesis gas
(c)$1: 1$ mixture of $\mathrm{O}_{2}$ and CO
(d)water gas.
Answer
Answer: C ✓ checked by 4AB · confidence medium
Explanation
An O₂/CO mixture burns to CO₂; a CO₂-rich atmosphere suppresses CaCO₃ ⇌ CaO + CO₂ and raises the decomposition temperature most (c).

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