Question

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Answer 1

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Explanation :—

Here is your answer —

1.) A – Physical change.

B – Chemical Change. (Magnesium Oxide)

C – Physical change.

D – Chemical Change. (Salt and Water)

2.) A – Fe.

B – CuSO⁴.

C – FeSO⁴.

D– Cu.

3.) A change in which one or more new substances

are formed is known as chemical change.

When the iron is exposed to air and moisture, rust formation takes place. Rust is nothing but iron oxide; a new substance formed out of the reaction. The colour of the surface of the iron also changes. Hence, rusting of iron is a chemical change.

Rust is not ferromagnetic, but it does still respond to a magnetic field and will be attracted to the poles of a permanent magnet.

4.) Galvanization is the method of coating iron with

Galvanization is the method of coating iron with zinc to prevent rusting. Zinc prevents the

Zinc prevents the formation of layer of oxide on the iron which in

the presence of air and water leads to rust

presence of air and water leads to rust formation.

presence of air and water leads to rust formation.The rusting of iron can also be prevented by painting, oiling, greasing or varnishing its surface.

5.) The pure copper sulphate can be obtained from

an impure sample using crystallization in which

the impure sample is dissolved in a suitable

solvent and heated in a water bath and allowed

to stand. After some time, pure crystals were

seen to grow from that solution. These

crystals are pure enough and the process is

called recrystallization since it involves obtaining

copper sulphate crystals from impure copper

sulphate crystals or compound.