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CHM 102 Sblock elements Objective Question
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Question

Sodium carbonate (Na₂CO₃) is mentioned in the document. What is its decomposition behavior on heating?
Options
A It decomposes readily below 500 °C to form sodium oxide and carbon dioxide.
B It does not decompose on heating, even above 1000 °C.
C It decomposes on heating to form sodium oxide and carbon dioxide, but only above a temperature of 1000 °C.
Correct Answer
D It decomposes into sodium and carbon dioxide, leaving no oxide residue.
Correct Answer

Option C is the correct answer.

Detailed Explanation

Page 16 states: 'Except for the carbonate of lithium, the carbonates of group 1 elements do not decompose on heating (except above temperature of 1000 °C)'. The equation 'Na₂CO₃(s) → Na₂O(s) + CO₂(g)' is given, indicating decomposition into sodium oxide and carbon dioxide, but only at high temperatures.

Hint

Look for the section discussing the decomposition of Group 1 carbonates on heating, specifically mentioning sodium carbonate on page 16.

Question Info

Course: CHM 102
Topic: Sblock elements
Type: Objective
Difficulty: Not specified
Question 1800 of 1999
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