Complete and balance the following equation:
Ca + H₂ $\to$ ________

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Solution

This is an example for a redox reaction.
The complete equation is:
$\underset{calcium}{Ca (s)} + \underset{hydrogen}{H_{2} (g)} \to \underset{calcium hydride}{{CaH}_{2} (s)}$
The reaction is already balanced as the number of calcium, oxygen and hydrogen atoms are equal on both sides.

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Complete and balance the following equations :

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(b) $H_{2} + S \to \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot$

(d) $C u o + \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \to C u + \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot$

(e) $F e + H_{2} O \to + \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot$

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Complete and balance the following equations. State the conditions wherever necessary.
(a) $C H \equiv C H + H_{2} \to$ ______ $+ H_{2} \to$ _________
(b) $C_{2} H_{4} + B r_{2} \to$ _________
(c) $C_{2} H_{4} + H C l \to$ _________
(d) $C a C_{2} + H_{2} O \to$ _________
(e) $C_{2} H_{2} + B r_{2} \to$ _________
(f) $C_{2} H_{5} O H [O] - ---- \to K_{2} C r_{2} O_{7}$ _________