Plss the answer these questions:
1.is steel a pure substance?
2.what are the two types of pure substances?
3.in electrolysis of a solution of potassium iodide with phenolphthalein indicator,a pink colour appears at the negative electrode.which one of the following is occurring?
a) hydrogen gas is being produced at the cathode and iodine at the anode.
b) hydrogen gas is being produced at the cathode and oxygen gas at the anode.
c)iodine is being produced at the cathode and oxygen gas at the anode.
d) oxygen gas is being produced at the cathode and iodine at the anode.
4.an electrolyte is a substance which conducts an electric current
a) when in solid state
b)when it is in the molten state
c)and is also gets decomposed by it
d)under any conditions
5.what happens when quicklime is added to water?
a)heat is absorbed
b)heat is produced
c) nitrogen is produced
d)nitrogen is absorbed