Question

ii)
Which one of the following reactions is feasible? Give support to your answer.
a) 2NaCl + F2 _ 2NaF + Cl2 sime
b) NaF + Cl2
NaCl + F2​

Answer 1

Explanation:

2 NaCl (aq) + F2 (g) → 2 NaF (aq) + Cl2 (g)

This is an oxidation-reduction (redox) reaction:

2 F0 + 2 e- → 2 F-I

(reduction)

2 Cl-I - 2 e- → 2 Cl0

(oxidation)

F2 is an oxidizing agent, NaCl is a reducing agent.

Reactants:

NaCl – Sodium chloride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02

Other names: {{unbulleted list source: wikipedia, accessed: 2019-09-27, Salt source: wikidata, accessed: 2019-09-02, Table salt source: wikidata, accessed: 2019-09-02

Appearance: Colorless cubic crystals source: wikipedia, accessed: 2019-09-27

F2

Names: Fluorine source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Fluorine-19 source: NIOSH NPG, accessed: 2019-09-02

Appearance: Yellow compressed gas with pungent odour source: ICSC, accessed: 2019-09-04; Pale-yellow to greenish gas with a pungent, irritating odor. source: NIOSH NPG, accessed: 2019-09-02

Products:

NaF – Sodium fluoride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04

Other names: Florocid source: wikipedia, accessed: 2019-09-27, Sodium fluoride (as F) source: NIOSH NPG, accessed: 2019-09-02, Floridine source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02

Appearance: White to greenish solid source: wikipedia, accessed: 2019-09-27; White crystals or powder source: ICSC, accessed: 2019-09-04; Odorless, white powder or colorless crystals. [Note: Pesticide grade is often dyed blue.] source: NIOSH NPG, accessed: 2019-09-02

Cl2

Names: Chlorine source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Molecular chlorine source: NIOSH NPG, accessed: 2019-09-02

Appearance: Greenish-yellow compressed liquefied gas with pungent odour source: ICSC, accessed: 2019-09-04; Greenish-yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]

Answer 2

Answer:

From the given reactions, the option (a) 2NaCl + F₂ --> 2 NaF + Cl₂.

Explanation:

• This reaction is a redox reaction where the fluorine is reduced and chlorine is simultaneously oxidized.
• In any redox reaction, the element oxidized is of lower electronegativity than the element that replaces it.
• We know, Fluorine is the most electronegative element on earth and thus it can replace chlorine by attracting the valence electrons of Na towards itself more strongly.
• Chlorine can not do so as the atomic size is bigger than that of Fluorine and thus lesser nuclear force. This explains why the second reaction is not feasible.

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