Nitrates of which pair gives different products on thermal decomposition___________________?
Correct answer: C. Li Na
- A. Na K
- B. Mg Ca
- C. Li Na
- D. Li Ca
Explanation
Lithium nitrate decomposes to lithium oxide, whereas sodium nitrate decomposes to sodium nitrite: 4LiNO3 -> 2Li2O + 4NO2 + O2 and 2NaNO3 -> 2NaNO2 + O2. Thus Li and Na nitrates produce different solid products. Students may choose Li and Ca because both can form oxides on heating, overlooking that the question asks for different products between the pair.
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About Reactions of Group I Elements
Group I elements have one valence electron, so their reactivity increases down the group as ionisation energy decreases. Their reactions with water, oxygen, hydrogen and halogens produce hydroxides, oxides, hydrides and halides, while the behaviour of lithium differs from the heavier metals because of its small ionic size.
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