Nitrates of which pair of elements give 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 on heating to lithium oxide, nitrogen dioxide and oxygen: 4LiNO3 → 2Li2O + 4NO2 + O2. Sodium nitrate gives sodium nitrite and oxygen, so the two nitrates produce different products. Students may choose magnesium and calcium, but both alkaline-earth nitrates generally form metal oxides, nitrogen dioxide and oxygen on strong heating.
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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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