Question

Q.5. I have understood the reactions taking place in beakers A and B. But I am still confused why there
is no change in beakers C, D and E. There could be displacement of zinc by copper in beaker C and
by Iron in beaker E. Similarly iron could be displaced by copper in beaker D.
2
[NCERT Intext Question]

please solve this...​

Answer 1

Answer:

Displacement reaction occur while the high reactive metal

displaces a less reactive metal

Step-by-step explanation:

In beaker C

• Displacement of Zinc by Copper .

Zinc is high reactive than copper

So, there is no change occurs .

In beaker D,

• Displacement of Zinc by Iron .

Zinc is high reactive than iron

So, there is no change occurs

In beaker E,

• Displacement of Iron by Copper.

Iron is high reactive than copper.

So, there is no change occurs.

Answer 2

Answer:

What changes do you observe in the arbitrary. It follows definite rules

various beakers? You have read that one based on facts. And the rule here is

metal displaces another metal from its that zinc is more reactive than copper

compound in aqueous solution. In and iron. A more reactive metal can

beaker ‘A’ zinc (Zn) replaces copper (Cu) replace a less reactive metal, but a less

from copper sulphate (CuSO ). That is reactive one cannot replace a more

4 reactive metal. Now you can

why the blue colour of copper sulphate

understand why there are no

disappears and a powdery red mass of

displacement reactions in beakers D

copper is deposited at the bottom of the

and E also. Can you guess the

beaker. The reaction can be represented

sequence of metals from more reactive

as follows:

to less reactive among zinc, iron and

copper?

Copper Sulphate (CuSO ) + Zinc (Zn)

4

(Blue)

4.3 Uses of Metals and

→ Zinc Sulphate (ZnSO ) + Copper (Cu)

4 Non-metals

(Colourless) (Red)

You should be able to guess why metals

You can write down the reaction are used in making machinery,

taking place in beaker ‘B’ in a similar automobiles, aeroplanes, trains,

manner. satellites, industrial gadgets, cooking

utensils, water boilers, etc. You are also

familiar with the uses of some non-

metals. Here are some interesting ones.

We are sure that you will guess them

I have understood the reactions right:

taking place in beakers ‘A’ and

‘B’. But I am still confused why l Non-metal is essential for our life

there is no change in beakers which all living beings inhale during

‘C’, ‘D’ and ‘E’? breathing,

l Non-metals used in fertilisers to

enhance the growth of plants,

There could have been displacement

of zinc by copper in beaker ‘C’ and by l Non-metal used in water purification

iron in beaker ‘E’. Similarly iron could process,

be displaced by copper in beaker ‘D’.

l Non-metal used in the purple

Since we do not see any change in coloured solution which is applied

beaker C, we can infer that copper is on wounds as an antiseptic,

not able to replace zinc from zinc

sulphate. But why? When zinc can l Non-metals used in crackers.

replace copper in beaker ‘A’ why You may add some more uses of

cannot copper replace zinc in beaker metals and non-metals from your

‘C’? Remember that science is not experiences.