Question

(A)- ${{N}_{2}}+3{{H}_{2}}\to 2N{{H}_{3}}$, name the type of reaction.
(B)- What happens when milk is left open at room temperature during summer?
(C)- What happens when quick lime is added to water?

Answer 1

Hint: In the reaction ${{N}_{2}}+3{{H}_{2}}\to 2N{{H}_{3}}$, there are no by-products. Milk has a compound that has the ability to convert itself into acid at a higher temperature. Quick lime is an inorganic compound that is made up of calcium and oxygen atoms. If the reactions occur and energy or heat is released then it will be categorized as an exothermic reaction and if the reactions occur when the energy is supplied or absorbed then it will be categorized as an endothermic reaction.

Complete answer:
(A)- The given reaction in the question is:
${{N}_{2}}+3{{H}_{2}}\to 2N{{H}_{3}}$
This is the reaction that is used to make ammonia from hydrogen and nitrogen. In this reaction, only one product is formed. Therefore, this reaction is known as a combination reaction.
(B)- When milk remains open at room temperature, it changes its taste and is sourd as a result of the disintegration of lactose into lactic acid due to lactic acid bacteria which also reduce the milk's pH as a result of lactic acid formation.
(C)- Quick lime is an inorganic compound that contains calcium and oxygen. Is it chemically known as calcium oxide and its formula is $CaO$ and it is reacting with water whose formula is ${{H}_{2}}O$, so there is the formation of calcium hydroxide having a formula $Ca{{(OH)}_{2}}$. The reaction is given below:
$CaO+{{H}_{2}}O\to Ca{{(OH)}_{2}}$
When the reaction occurs there is a release of a huge amount of energy so, it is categorized as an exothermic reaction. The energy released in this reaction is so large that it can even cause the water to boil, so it is highly exothermic.

Note:
We can also categorize the reaction of the formation of calcium hydroxide from calcium oxide and water as a combination reaction because there is only the formation of one product from two reactants.