Question

Complete the following reaction.1) aqueous solution of NaOH react with zinc.2)pure water on electrolysis.3) dilute HCl react with zinc.
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Answer 1

Answer:

1. Zinc reacts with aqueous sodium hydroxide to form sodium zincate and hydrogen gas. The reaction takes place at a temperature of 550∘C. This compound is possible because Zn is capable of displacing Hydrogen from both acids and bases and therefore is called an Amphoteric metal and its oxide is an Amphoteric oxide.

2. In pure water at the negatively charged cathode, a reduction reaction takes place, with electrons (e−) from the cathode being given to hydrogen cations to form hydrogen gas. The half reaction, balanced with acid, is: Reduction at cathode: 2 H+(aq) + 2e− → H2(g)

Cathode (reduction): 2 H2O(l) + 2e−

3. The reaction between zinc metal and HCl

Zinc reacts easily with the acid to produce hydrogen bubbles. It is a single displacement reaction in which hydrogen is displaced by zinc metal to form hydrogen gas and a salt, zinc chloride.

Explanation:

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