1) A suspension of rust in water turns __________litmus ____________ 2)In general, metallic oxides are ___________ in nature whereas - Science - Materials Metals and Non-Metals

Question

1) A suspension of rust in water turns
__________litmus ____________ 
2)In general, metallic oxides are
___________ in nature whereas oxides of non metals are
_________ in nature
5) Metals react with acids to
produce___________ gas which burns with a __________
sound
7) The elements
which possess character of both metals and non metals are
called __________
Q 7 When zinc granules are put in copper sulphate
solution and left undisturbed for sometime, we find
that the blue colour of the solution disappears and a powdery
red mass is deposited at the bottom of the beaker Write the
equation involved What type of reaction is this?
Explain the observations
Q 8 When we keep copper turning in zinc-sulphate
solution for sometime, we find that there is no change
Explain why is it so?

Kirti Gogia · Accepted Answer

Rust is chemically Fe2O3 XH2O,
where X are the number of water molecules We know that metals
generally form oxides that are basic in nature Hence a suspension
of rust in water will be basic Therefore it will turn red
litmus blue
In general metal oxides are basic in nature where as
oxides of non-metals are acidic in nature
Metals react with acids to produce hydrogen gas that
burns with a pop sound
The elements which possess character of both metals and non
metals are called metalloids

Q 7) Zinc is more reactive than copper For the same reason, it
is placed above copper in the reactivity series Hence, when zinc
granules are placed in copper sulphate solution, it will displace
copper from its salt Thus zinc sulphate will be formed and copper
metal will be deposited at the bottom of solution The blue colour
of the solution will also fade away as copper is displaced from its
salt The following reaction occurs
Zn(s) + CuSO4 (aq) ------------> ZnSO4
(aq) + Cu(s)
Q 8) Copper is less reactive than zinc Hence it will not be able
to displace zinc from its salt Therefore when copper turning
are kept in zinc-sulphate solution for sometime, we find that there
is no change as zinc is not displaced from its salt and hence no
reaction occurs