Reactivity of Metals

Free sample questions

Reactivity of Metals — sample Science questions with answers

1. Question 1

   Among the following metals, which is the most reactive?

   • APotassium ($\text{K}$)
   • BCalcium ($\text{Ca}$)
   • CMagnesium ($\text{Mg}$)
   • DZinc ($\text{Zn}$)

   Answer: A. Potassium ($\text{K}$)

   Potassium is at the top of the metal reactivity series, making it the most reactive.

2. Question 2

   Which metal does not react with water?

   • ASodium ($\text{Na}$)
   • BCopper ($\text{Cu}$)
   • CCalcium ($\text{Ca}$)
   • DMagnesium ($\text{Mg}$)

   Answer: B. Copper ($\text{Cu}$)

   Copper is a less reactive metal and does not react with water.

3. Question 3

   What is the product of burning magnesium in oxygen?

   • AMagnesium oxide ($\text{MgO}$)
   • BMagnesium hydroxide (${\text{Mg(OH)}}_2$)
   • CMagnesium chloride (${\text{MgCl}}_2$)
   • DMagnesium sulphate (${\text{MgSO}}_4$)

   Answer: A. Magnesium oxide ($\text{MgO}$)

   Magnesium burns in oxygen to produce magnesium oxide, a white solid.

4. Question 4

   Which metal can displace zinc from zinc sulphate (${\text{ZnSO}}_4$) solution?

   • ACopper ($\text{Cu}$)
   • BSilver ($\text{Ag}$)
   • CMagnesium ($\text{Mg}$)
   • DTin ($\text{Sn}$)

   Answer: C. Magnesium ($\text{Mg}$)

   Magnesium is more reactive than zinc, so it can displace zinc from its compound.

5. Question 5

   What is the suitable extraction method for aluminium from bauxite ore?

   • AReduction using carbon
   • BElectrolysis
   • CHeating alone
   • DPhysical extraction

   Answer: B. Electrolysis

   Aluminium is very reactive, so it needs to be extracted by electrolysis of molten aluminium oxide.