Identify the redox reactions out of the following reactions and identify the oxidising and reducing agents in them. 

(i) 3HCl(aq) + HNO₃ (aq) → Cl₂ (g) + NOCl (g) + 2H₂O (l )

(ii) HgCl₂ (aq) + 2KI (aq) → HgI₂ (s) + 2KCl (aq)

(iii) Fe₂O₃ (s) + 3CO (g) →   2Fe (s) + 3CO₂ (g)

(iv) PCl₃ (l) + 3H₂O (l) → 3HCl (aq) + H₃ PO₃ (aq)

(v) 4NH₃ + 3O₂ (g) → 2N₂ (g) + 6H₂O (g)

This is a Short answer type question as classified in NCERT Exemplar

(i) We can write the given reaction along with their oxidation numbers as-

As, chlorine is oxidised in hydrochloric acid (behaving as reducing agent) -as its oxidation number is increases during the reaction from -1 to 0) and nitric acid is reduced (behaving as oxidising agent) as its oxidation number is decreases during the reaction from +5 to +3). Hence, it is the redox reaction.

 

(ii) We can write the given reaction along with their oxidation numbers as-

Here, oxidation number of none of the atoms change hence it is not a redox reaction.

 

(iii) We can write

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This is a Short answer type question as classified in NCERT Exemplar

(i) We can write the given reaction along with their oxidation numbers as-

As, chlorine is oxidised in hydrochloric acid (behaving as reducing agent) -as its oxidation number is increases during the reaction from -1 to 0) and nitric acid is reduced (behaving as oxidising agent) as its oxidation number is decreases during the reaction from +5 to +3). Hence, it is the redox reaction.

 

(ii) We can write the given reaction along with their oxidation numbers as-

Here, oxidation number of none of the atoms change hence it is not a redox reaction.

 

(iii) We can write the given reaction along with their oxidation numbers as-

As, carbon is oxidised in carbon monoxide (behaving as reducing agent) -as its oxidation number is increases during the reaction from +2 to +4) and ferric oxide is reduced (behaving as oxidising agent) as its oxidation number is decreases during the reaction from +3to 0). Hence, it is the redox reaction.

 

(iv) We can write the given reaction along with their oxidation numbers as-

Here, oxidation number of none of the atoms change hence it is not a redox reaction.

 

(v) We can write the given reaction along with their oxidation numbers as-

As, nitrogen is oxidised in ammonia (behaving as reducing agent) -as its oxidation number is increases during the reaction from -3 to 0) and oxygen is reduced (behaving as oxidising agent) as its oxidation number is decreases during the reaction from 0 to -2). Hence, it is the redox reaction.

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<div>This is a Short answer type question as classified in NCERT Exemplar</div><p><strong> (i) </strong>We can write the given reaction along with their oxidation numbers as-</p><div><div><picture><source srcset="https://images.shiksha.com/mediadata/images/articles/1743578405phpaEX4aZ_480x360.jpeg" media=" (max-width: 500px)"><img src="https://images.shiksha.com/mediadata/images/articles/1743578429phpWaMAuT_480x360.jpeg" alt="" width="478" height="39"></picture></div></div><p>As, chlorine is oxidised in hydrochloric acid (behaving as reducing agent) -as its oxidation number is increases during the reaction from -1 to 0) and nitric acid is reduced (behaving as oxidising agent) as its oxidation number is decreases during the reaction from +5 to +3). Hence, it is the redox reaction<strong>.</strong></p><p>&nbsp;</p><p><strong> (ii) </strong>We can write the given reaction along with their oxidation numbers as-</p><div><div><picture><source srcset="https://images.shiksha.com/mediadata/images/articles/1743578429phpWaMAuT_480x360.jpeg" media=" (max-width: 500px)"><img src="https://images.shiksha.com/mediadata/images/articles/1743578447phpI0mfYj.jpeg" alt="" width="511" height="51"></picture></div></div><p>Here, oxidation number of none of the atoms change hence it is not a redox reaction.</p><p>&nbsp;</p><p><strong> (iii) </strong>We can write the given reaction along with their oxidation numbers as-</p><div><div><picture><source srcset="https://images.shiksha.com/mediadata/images/articles/1743578447phpI0mfYj_480x360.jpeg" media=" (max-width: 500px)"><img src="https://images.shiksha.com/mediadata/images/articles/1743578447phpI0mfYj.jpeg" alt="" width="453" height="55"></picture></div></div><p>As, carbon is oxidised in carbon monoxide (behaving as reducing agent) -as its oxidation number is increases during the reaction from +2 to +4) and ferric oxide is reduced (behaving as oxidising agent) as its oxidation number is decreases during the reaction from +3to 0). Hence, it is the redox reaction<strong>.</strong></p><p>&nbsp;</p><p><strong> (iv) </strong>We can write the given reaction along with their oxidation numbers as-</p><div><div><picture><source srcset="https://images.shiksha.com/mediadata/images/articles/1743578463phpeAlS6B.jpeg" media=" (max-width: 500px)"><img src="https://images.shiksha.com/mediadata/images/articles/1743578463phpeAlS6B.jpeg" alt="" width="484" height="60"></picture></div></div><p>Here, oxidation number of none of the atoms change hence it is not a redox reaction.</p><p>&nbsp;</p><p><strong> (v) </strong>We can write the given reaction along with their oxidation numbers as-</p><div><div><picture><source srcset="https://images.shiksha.com/mediadata/images/articles/1743578481phpn8Js0K_480x360.jpeg" media=" (max-width: 500px)"><img src="https://images.shiksha.com/mediadata/images/articles/1743578481phpn8Js0K.jpeg" alt="" width="355" height="49"></picture></div></div><p>As, nitrogen is oxidised in ammonia (behaving as reducing agent) -as its oxidation number is increases during the reaction from -3 to 0) and oxygen is reduced (behaving as oxidising agent) as its oxidation number is decreases during the reaction from 0 to -2). Hence, it is the redox reaction<strong>.</strong></p>

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