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

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. …

For each part, identify which class of reaction is being asked for (direct combination, thermal decomposition, or acid-base with CO2) and write the corresponding balanced equa …

• Writing Rb2O or Rb2O2 instead of the superoxide RbO2 for part (iii) -- Rb, like K and Cs, specifically forms the superoxide with excess oxygen, not the normal oxide or peroxide. …