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

//Multiple Choice

What does the reactivity series represents {
    ~The order of metals based on their atomic number
    =The order of metals based on their reactivity
    ~The order of metals based on their density
    ~All of the above
}

Which of the following metals is the most reactive? {
    ~Copper
    ~Zinc
    =Potassium
    ~Iron
}

In the reactivity series, which metal is placed at the bottom? {
    ~Silver
    ~Gold
    =Platinum
    ~Copper
}

Which of the following metals can displace copper from copper sulfate solution? {
    ~Silver
    =Zinc
    ~Gold
    ~Platinum
}

What is observed when iron is placed in a solution of copper sulfate? {
    ~No reaction occurs
    =Copper is displaced, and iron sulfate is formed
    ~The solution turns green
    =Both b and c
}

Which of the following is the correct order in the reactivity series? {
    =Sodium > Calcium > Zinc > Copper
    ~Zinc > Sodium > Calcium > Copper
    ~Copper > Zinc > Sodium > Calcium
    ~Calcium > Sodium > Copper > Zinc
}

Which metal does not react with dilute acids to produce hydrogen gas? {
    ~Magnesium
    ~Zinc
    =Copper
    ~Iron
}

What happens when a less reactive metal is placed in the solution of a more reactive metal's salt? {
    ~The less reactive metal displaces the more reactive metal
    =No reaction occurs
    ~The solution changes color
    ~A precipitate forms
}

Why is aluminum placed higher in the reactivity series despite its resistance to corrosion? {
    ~It is less dense
    ~It reacts faster with water
    =It forms a protective oxide layer
    ~It reacts with acids easily
}

Which metal can be used to extract iron from its ore in a blast furnace? {
    ~Zinc
    =Carbon
    ~Aluminum
    ~Magnesium
}

//True or False

Zinc can displace copper from copper sulfate solution. {T}

Magnesium can displace iron from iron sulfate solution. {T}

Copper can displace zinc from zinc sulfate solution. {F}

Aluminum is more reactive than iron and can displace it from iron oxide. {T}

Silver can displace copper from copper nitrate solution. {F}

Potassium reacts with water to form potassium hydroxide and hydrogen gas. {T}

Sodium is less reactive than calcium and cannot displace it from its compounds. {F}

Iron can displace silver from silver nitrate solution. {T}

Gold does not react with hydrochloric acid because it is the least reactive metal. {T}

Lead can displace magnesium from magnesium sulfate solution. {F}

//Fill in the blanks

The reactivity series is a list of metals arranged in the order of their ________. {
    ~Atomic size
    =Reactivity
    ~Melting point
}

________ is the most reactive metal in the reactivity series. {
    =Potassium
    ~Zinc
    ~Copper
}

In the reactivity series, ________ is the least reactive metal. {
    ~Gold
    =Platinum
    ~Silver
}

A more reactive metal can ________ a less reactive metal from its salt solution. {
    ~Combine with
    =Displace
    ~Dissolve
}

________ reacts vigorously with cold water to form an alkaline solution and hydrogen gas. {
    =Sodium
    ~Iron
    ~Lead
}

Metals like ________ and ________ do not react with dilute acids. {
    ~Zinc and Copper
    =Copper and Gold
    ~Iron and Magnesium
}

When zinc reacts with dilute hydrochloric acid, it produces ________ gas. {
    ~Oxygen
    =Hydrogen
    ~Carbon dioxide
}

The oxide of a metal higher in the reactivity series can be reduced by ________. {
    ~Heating
    ~Carbon
    =Electrolysis
}

________ forms a protective oxide layer, preventing it from corroding. {
    ~Iron
    =Aluminum
    ~Zinc
}

In the reactivity series, metals like ________ are placed above hydrogen because they can displace it from acids. {
    ~Copper
    =Zinc
    ~Gold
}

//Numericals



//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Potassium -> Highly reactive
=Iron -> Moderately reactive
=Silver -> Least reactive
=Zinc -> Above Hydrogen 
}


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