Nitrates of which pair of elements gives different products on thermal decomposition?
Correct answer: C. Li, Na
- A. Na, K
- B. Mg, Ca
- C. Li, Na
- D. Li, Ca
Explanation
The metal oxides formed from the thermal decomposition of sodium nitrate and lithium nitrate are different. Sodium nitrate produces sodium nitrite (NaNO2), while lithium nitrate produces lithium oxide (Li2O). Therefore, the nitrates of sodium and lithium give different products upon thermal decomposition.
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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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