Question

1.
Why does the colour of copper sulphate solution change when
an iron nail is dipped in it?
Give an example of a double displacement reaction other than
the one given in Activity 1.10.
Identify the substances that are oxidised and the substances
that are reduced in the following reactions,
a) 4Na(s) + 0,9 2NaO(s)
fi) CuO(s) + HC → Cu(s) +H.O(1)​

Answer 1

Answer:

iron being more reactive than silver , displaces copper from copper sulphate and form ferrous sulphate and copper

so, blue color change to pale green

Answer 2

Answer:

The colour of cuso4 change due to displacement of copper by iron

Na2so4+Bacl2> Nacl+Baso4