What is the common name for sodium carbonate?
A. Eating Soda
B. Washing soda
C. Bleaching powder
D. Ordinary salt
Answer: Option B
A. Eating Soda
B. Washing soda
C. Bleaching powder
D. Ordinary salt
Answer: Option B
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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