Question

Justify that the reaction : 2 Na(s) + H2(g)→→2 NaH(s) is a redox reaction                   (2 Marks)
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Answer 1

Here oxidation states can be written as

Na⁽⁰⁾  +  H2⁽⁰⁾ ------------ Na⁽⁺¹⁾H⁽⁻¹⁾

As oxidation numbers are changing so it is a redox reaction

PLS MARK AS BRAINLIEST

Answer 2

Answer:

Since in the above reaction the compound

formed is an ionic compound, which may

also be represented as Na+ H– (s), this

suggests that one half reaction in this

process is :

2 Na (s) → 2 Na+ (g) + 2e–

and the other half reaction is:

H2 (g) + 2e– → 2 H– (g)

This splitting of the reaction under

examination into two half reactions

automatically reveals that here sodium is

oxidised and hydrogen is reduced,

therefore, the complete reaction is a redox

change.

Explanation:

Since in the above reaction the compound

formed is an ionic compound, which may

also be represented as Na+ H– (s), this

suggests that one half reaction in this

process is :

2 Na (s) → 2 Na+ (g) + 2e–

and the other half reaction is:

H2 (g) + 2e– → 2 H– (g)

This splitting of the reaction under

examination into two half reactions

automatically reveals that here sodium is

oxidised and hydrogen is reduced,

therefore, the complete reaction is a redox

change.