Zinc is used to protect iron form corrosion because zinc is
A. more electropositive than iron
B. cheaper than iron
C. a bluish white metal
D. a good conductor of heat and electricity
Answer: Option A
A. more electropositive than iron
B. cheaper than iron
C. a bluish white metal
D. a good conductor of heat and electricity
Answer: Option A
Which of the following metals cannot be easily cut by a knife?
A. aluminium
B. sodium
C. potassium
D. lithium
The chemical structure of the pearl is
A. Calcium Carbonate
B. Calcium Carbonate & Magnesium Carbonate
C. Calcium Chloride
D. Calcium Sulphate
Stainless steel does not rust because
A. chromium and nickel combine with iron
B. chromium forms an oxide layer and protects iron from rusting
C. nickel present in it, does not rust
D. iron forms a hard chemical compound with chromium present in it
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