- (A) Potassium
- (B) Calcium
- (C) Sodium
- (D) Magnesium
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- Which is the hardest known natural mineral?
- (A) Graphite
- (B) Diamond
- (C) Tungsten
- (D) Cobalt
- Avagodro’s number is?
- (A) 6.02×1024
- (B) 6.02×1023
- (C) 6.00×1023
- (D) 6.62×1023
- When a molecule lose or gain electron it forms a?
- (A) Molecular ion
- (B) Cation
- (C) Ion
- (D) None of the above
- Atom having positive charge is called?
- (A) Anion
- (B) Cation
- (C) Ion
- (D) Canion
- What is the empirical formula of benzene?
- (A) OH
- (B) CH
- (C) CO
- (D) HC
- Elements are represented by which of the following?
- (A) Symbols
- (B) Abbreviations
- (C) Signs
- (D) Chemical formulas
- How much percentage of earth crust consist of silicon?
- (A) 20%
- (B) 28%
- (C) 32%
- (D) 36%
- Branch of chemistry which deals with radio activity, nuclear processes and properties is called?
- (A) Analytical chemistry
- (B) Nuclear chemistry
- (C) Industrial chemistry
- (D) Bio chemistry