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CHM 102 Sblock elements Objective Question
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Question

What is the primary reason for the instability of Lithium carbonate (Li₂CO₃) on heating, compared to other Group 1 carbonates?
Options
A Its large ionic size and low polarizing power.
B The formation of a less stable lattice for Li₂O compared to Li₂CO₃.
C Its strong polarizing power due to its small size, which destabilizes the carbonate ion.
Correct Answer
D Lithium carbonate is naturally volatile and sublimes upon heating.
Correct Answer

Option C is the correct answer.

Detailed Explanation

Page 19 states that 'Instability of Li₂CO₃ is due to ; ✓ Stable lattice of Li₂O than Li₂CO₃' and '✓ Also strong polarizing power due to its small size'. This strong polarizing power of the small Li⁺ ion destabilizes the large carbonate ion, making Li₂CO₃ less stable to heat.

Hint

Recall the discussion about Lithium's anomalous behavior and its ionic properties, especially concerning polarizing power and size, on page 19.

Question Info

Course: CHM 102
Topic: Sblock elements
Type: Objective
Difficulty: Not specified
Question 1801 of 1999
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