Question : Earth's core is mainly made up of _____________.

Option 1: nickel and copper

Option 2: nickel and alumina

Option 3: nickel and iron

Option 4: nickel and magnesium

Question : The metal ion present in vitamin B₁₂ is :

Option 1: Cobalt
 

Option 2: zinc

Option 3: nickel

Option 4: iron

Question : Which of the following is the most abundant metal on Earth's crust?

Option 1: Magnesium

Option 2: Iron

Option 3: Copper

Option 4: Aluminium

Question : Bronze is an alloy of

Option 1: Copper and Tin

Option 2: Copper and Zinc

Option 3: Copper and Iron

Option 4: Iron and Nickel

Question : Pregnant women usually become deficient in

Option 1: Sodium and Calcium

Option 2: Iron and Sodium

Option 3: Calcium and Iron

Option 4: Magnesium and Iron