Find the number of reaction which produces H 2 . (1) H 2 O / H + electrolysis (2) Zn + dil. HCl ⟶ (3) Al + NaOH Aq. ⟶ (4) Zn + KOH Aq. ⟶ (5) Hydrolith + water ⟶ (6) Red Hot C + steam H 2

Question

Find the number of reaction which produces $H_{2}$ .

(1) $H_{2} O / H^{+} electrolysis$ (2) $Zn +$ dil. $HCl ⟶$

(3) $Al + NaOH_{Aq.} ⟶$ (4) $Zn + KOH_{Aq.} ⟶$

(5) Hydrolith + water ⟶ (6) $Red Hot C + steam H_{2} O Δ$

(7) Au + dil. HCl → (8) Zn + very dil. $HNO_{3} ⟶$

(9) $K + H_{2} O room temperature$ (10) $Be + H_{2} O room temperature$

(11) $Sn + KOH_{Aq.} ⟶$ (12) $CH_{4} + H_{2} O 1200 K NiO$

TestHub · Accepted Answer

Reactions producing H₂: (1), (2), (3), (4), (5), (6), (9), (11), and (12).

Explanation: Active/amphoteric metals (K, Zn, Al, Sn) reacting with water, acids, or alkalis, and hydrolith (CaH₂) reacting with water all liberate H₂. Industrial methods like water electrolysis, steam reforming of CH₄, and red-hot coke with steam also yield H₂.

Reactions NOT producing H₂: (7) Gold is unreactive with HCl; (8) Zn with very dilute HNO₃ produces NH₄NO₃; (10) Beryllium does not react with room-temperature water.

Final Answer: The total number of reactions that produce H₂ gas is 9.00.

Chemistry - Hydrogen and Its compound Question with Solution | TestHub

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