The following reaction is an example of a4NH3 (g) + 5O 2(g) → 4NO(g) + 6H2 O(g)(i) displacement reaction(ii) combination reaction(iii) redox reaction(iv) neutralisation reaction(a) (i) and (iv) (b) (ii) and (iii)(c) (i) and (iii) (d) (iii) and (iv)3. Which of the following statements about the given reaction are correct?3Fe(s) + 4H 2O(g) → Fe3 O4 (s) + 4H2 (g)(i) Iron metal is getting oxidised(ii) Water is getting reduced(iii) Water is acting as reducing agent(iv) Water is acting as oxidising agent(a) (i), (ii) and (iii) (b) (iii) and (iv)(c) (i), (ii) and (iv) (d) (ii) and (iv)4. Which of the following are exothermic processes?(i) Reaction of water with quick lime(ii) Dilution of an acid(iii) Evaporation of water(iv) Sublimation of camphor (crystals)(a) (i) and (ii) (b) (ii) and (iii)(c) (i) and (iv) (d) (iii) and (iv)Chemical Reactionsand Equations1CHAPTER

The given reaction, a4NH3 (g) + 5O2 (g) → 4NO (g) + 6H2O (g), is an example of a chemical reaction. To determine the type of reaction, we can analyze the reactants and products.

(i) Displacement reaction: This type of reaction involves the displacement of one element by another in a compound. In the given reaction, there is no displacement of elements, so it is not a displacement reaction.

(ii) Combination reaction: This type of reaction involves the combination of two or more substances to form a single product. In the given reaction, multiple reactants combine to form multiple products, so it is not a combination reaction.

(iii) Redox reaction: This type of reaction involves both oxidation and reduction processes. In the given reaction, nitrogen (N) is oxidized from -3 to +2 oxidation state, while oxygen (O) is reduced from 0 to -2 oxidation state. Therefore, it is a redox reaction.

(iv) Neutralization reaction: This type of reaction occurs when an acid reacts with a base to form a salt and water. In the given reaction, there are no acids or bases involved, so it is not a neutralization reaction.

Therefore, the correct answer is (c) (i) and (iii) for the first question.

Moving on to the second question, the given reaction is 3Fe (s) + 4H2O (g) → Fe3O4 (s) + 4H2 (g). Let's analyze the statements about this reaction.

(i) Iron metal is getting oxidized: In the given reaction, iron (Fe) is oxidized from 0 to +3 oxidation state. So, this statement is correct.

(ii) Water is getting reduced: In the given reaction, water (H2O) is not involved in any reduction process. So, this statement is incorrect.

(iii) Water is acting as a reducing agent: In the given reaction, water is not involved in any reduction process. So, this statement is incorrect.

(iv) Water is acting as an oxidizing agent: In the given reaction, water is not involved in any oxidation process. So, this statement is incorrect.

Therefore, the correct answer is (a) (i), (ii), and (iv) for the second question.

Moving on to the third question, let's determine which processes are exothermic.

(i) Reaction of water with quicklime: This reaction releases heat, so it is an exothermic process.

(ii) Dilution of an acid: Dilution of an acid is an exothermic process as it releases heat.

(iii) Evaporation of water: Evaporation of water is an endothermic process as it absorbs heat.

(iv) Sublimation of camphor (crystals): Sublimation of camphor is an endothermic process as it absorbs heat.

Therefore, the correct answer is (a) (i) and (ii) for the third question.