Q7 of 216 Page 496

State which of the following chemical reaction will take place, giving a suitable reason for each.

Zn(s)+CuSO4(aq)→ ZnSO4(aq) + Cu(s)


Fe(s)+ ZnSO4(aq) → FeSO4(aq)+Zn(s)


Zn(s)+ FeSO4→ ZnSO4+Fe(s)

(i) Zn(s)+CuSO4(aq) → ZnSO4(aq) + Cu(s)


The above reaction will take place as zinc is more reactive than copper and hence, it will displace copper from its solution of copper sulphate, thus, forming zinc suphate and leaving copper ion.


(ii)Fe(s)+ ZnSO4(aq) → FeSO4(aq)+Zn(s)


The reaction will not take place as iron is less reactive than zinc and will not be able to displace zinc from zinc sulphate solution.


(iii) Zn(s)+ FeSO4→ ZnSO4+Fe(s)


The reaction will take place in the forward direction as zinc is more reactive than iron and hence will displace iron from its solution of ferrous sulphate, thus, forming Zinc sulphate and leaving behind iron.


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Quote three instances where human intervention saved the forests from destruction.

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i. Why potato chips manufacturers fill the packet of chips with nitrogen gas?

ii. A student has been collecting silver coins and copper coins. One day she observed a black coating on silver coins and a green coating on copper coins. Which chemical phenomenon is responsible for these coatings? Write the chemical name of black and green coatings.


OR


i. Crystals of copper sulphate are heated in a test for some time.


(a) What is the colour of copper sulphate crystals before heating, and after heating?


(b) What is the source of liquid droplets seen on the inner upper side of the test tube during the heating process?


ii. A metal ‘X’ when dipped in an aqueous solution of aluminium sulphate no reaction is observed whereas when it is dipped in an aqueous solution of ferrous sulphate, the pale green solution turns colourless. Identify metal ‘X’ with reason.

 8

What is a homologous series of carbon compounds? List its any two characteristic. Write the name and formula of next higher homologue of HCOOH.

 9

Label parts 1 to 6 in the given figure of the brain.


i. Answer the following:


(a) Which hormone is responsible for the changes noticed in females at puberty?


(b) Dwarfism results due to deficiency of which hormone?


(c) Blood sugar level rises due to deficiency of which hormone?


(d) Iodine is necessary for the synthesis of which hormone?


(e) Which hormone controls the metabolism of calcium and phosphorus in human beings?


ii. Give an example of a plant hormone that promotes growth.