$CATEGORY: Science - Khan Academy/3.Metals and Non-metals/3.Metals and Non-metals--Occurence of Metals

//Multiple Choice

What is the purpose of electrolytic refining?
{
= To purify impure metals
~ To extract metals from ores
~ To alloy metals
~ To prevent corrosion
}

In the electrolytic refining of copper, the cathode is made of\:
{
~ Impure copper
= Pure copper
~ Graphite
~ Zinc
}

Which electrolyte is commonly used in the electrolytic refining of copper?
{
~ Copper nitrate solution
= Copper sulfate solution with dilute sulfuric acid
~ Sodium chloride solution
~ Zinc sulfate solution
}

During the electrolytic refining of a metal, impurities are\:
{
~ Deposited at the anode
~ Deposited at the cathode
= Collected as anode mud
~ Dissolved in the electrolyte
}

Which of the following metals is NOT typically refined using electrolytic refining?
{
~ Copper
~ Zinc
= Iron
~ Silver
}

//True or False

In electrolytic refining, impure metal is used as the cathode. {F}

The pure metal is deposited on the cathode during electrolytic refining. {T}

Anode mud contains valuable metals like gold and platinum. {T}

Electrolytic refining is a method used for the extraction of metals from ores. {F}

During electrolytic refining of copper, copper ions from the anode enter the electrolyte. {T}   

//Fill in the blanks

In electrolytic refining, the impure metal is used as the __________.
{
~ Cathode
= Anode
~ Electrolyte
}

During electrolytic refining, pure metal is deposited at the __________.
{
= Cathode
~ Anode
~ Electrolyte
}

The impurities settle down as __________ during electrolytic refining.
{
= Anode mud
~ Cathode residue
~ Electrolyte sludge
}

The electrolyte used in the electrolytic refining of copper is __________.
{
~ Copper chloride solution
= Copper sulfate solution with dilute sulfuric acid
~ Zinc sulfate solution
}

Electrolytic refining is used for metals like copper, zinc, and __________.
{
~ Sodium
= Silver
~ Potassium
}

//Numericals



//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Impure metal -> Anode 
=Pure metal -> Cathode
=Copper sulfate solution -> Electrolyte
=Valuable impurities -> Anode mud
=Refining method -> Electrolytic refining
}


//******** END **********