reaction 10th

Question 1

What happens when zinc granules are treated with dilute solution of H2SO4, HCl, HNO3 , NaCl and NaOH, also write the chemical equations if reaction occurs.
Answer:
In the case of the reaction of zinc granules with Sulphuric acid or Hydrochloric acid, a salt 
is formed - Zinc sulphate or Zinc Chloride respectively - and the Hydrogen gas is released.

Zn + H2SO4→ ZnSO4 + H2↑
Zn + 2HCl → ZnCl2 + H2↑

Similarly, Hydrogen gas and Zinc Nitrate is formed when the Zinc granules are treated with HNO3 .

Zn + 2HNO3 → Zn(NO3 )2 + H2↑

In the case of NaCl, Zinc being less reactive than Sodium, no reaction occurs.
When zinc is made to react with NaOH, it forms Sodium zincate and hydrogen gas.

Zn + 2H2O + 2NaOH→ Na2Zn(OH)4 + H2↑


Question 2
On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, 
white precipitate is obtained.

(a) Write a balanced chemical equation of the reaction involved

(b) What other name can be given to this precipitation reaction?

(c) On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. 
Why?

Answer:
(a) When Barium chloride solution is added to an aqueous solution of sodium sulphite, we obtain a white precipitate of Barium Sulphite along with Sodium Chloride.

BaCl2 + Na2SO3→ BaSO3 + 2NaCl

(b) This precipitation reaction can also be categorised as a double displacement reaction.
A double displacement reaction is a type of chemical reaction in which two chemical compounds react and the positive ions(cations) and the negative ions(anions) of the two 
compounds switch places.

(c) The white precipitate of sodium chloride reacts with hydrochloric acid to form Barium 
Chloride and water and release sulphur dioxide. Barium chloride is a soluble salt which is 
why the white precipitate of Barium Sulphite disappears.
The chemical reaction for the above process is 

BaSO3 + HCl → BaCl3+SO2+H2O


Question 3
You are provided with two containers made up of copper and aluminium. You are also 
provided with solutions of dilute HCl, dilute HNO3, ZnCl2 and H2O. In which of the above containers these solutions can be kept?

Answer:
The solutions of dilute HCl, ZnCl2 and H2O can be kept in the container that is made of Copper. The Aluminium container can hold dilute HNO3 and H2O.We can store a solution in a container with which the solution will not react.
When compared to Aluminium, copper is a less reactive metal. Also, Copper is placed below Hydrogen in the activity series. Therefore, it will not react with dilute HCl or H2O; due to which we can store them in the copper container. However, dilute HNO3 being a strong oxidising agent, will react with Copper and hence cannot be stored in a copper 
container. Copper, being less reactive than Zinc, will not react with ZnCl2.Aluminium, on the other hand, is highly reactive and can react with the said solutions. 
However when dilute HNO3 comes in contact with Aluminium, a protective layer of Aluminium Oxide is formed which prevents further reaction. Therefore, dilute HNO3 can be stored in an Aluminium container. Also, Aluminium does not react with water. So, water can be stored in the Aluminium container as well.

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