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Write Brief Answer · Q4

Q.Write balanced chemical equation for each of the following chemical reactions.

(i) Lithium metal with nitrogen gas
(ii) heating solid sodium bicarbonate
(iii) Rubidum with oxygen gas
(iv) solid potassium hydroxide with CO₂
(v) heating calcium carbonate
(vi) heating calcium with oxygen
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Step 1. (i) Lithium metal with nitrogen gas: lithium is the only alkali metal that reacts directly with N₂, giving the nitride -- 6Li + N₂ → 2Li₃N.

Step 2. (ii) Heating solid sodium bicarbonate: NaHCO₃ decomposes on heating to sodium carbonate, water and carbon dioxide -- 2NaHCO₃ →(Δ)→ Na₂CO₃ + H₂O + CO₂.

Step 3. (iii) Rubidium with oxygen gas: Rb, being one of the heavier alkali metals (K, Rb, Cs), forms the superoxide with excess oxygen -- Rb + O₂ → RbO₂.

Step 4. (iv) Solid potassium hydroxide with CO₂: a hydroxide reacting with carbon dioxide gives the carbonate (with excess CO₂, the bicarbonate forms instead) -- 2KOH + CO₂ → K₂CO₃ + H₂O. …

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