10 Important MCQ Question & Answer for WBCS / IAS on Chemistry
MCQ on Chemistry
1. Lunar caustic is –
A) Caustic Soda
B) Silver Nitrate
C) Ammonium Chloride
D) Calcium Sulphate
Ans: B) Silver Nitrate
2. The formula for cane sugar is –
A) C6H5OH
B) C7H8O
C) C6H12O6
D) C12H12O11
Ans: D) C12H12O11
3. The Law of Octaves was stated by
A) Lothar Meyer
B) T.W. Richards
C) J.A.R. Newlands
D) Victor Meyer
Ans: C) J.A.R. Newlands
4. Nitre is –
A) KNO3
B) KMnO4
C) CaOCl2
D) NaNO3
Ans: A) KNO3
5. ‘Hypo’ is –
A) Potassium Nitrate
B) Sodium Nitrate
C) Ammonium Chloride
D) Sodium Thiosulphate
Ans: D) Sodium Thiosulphate
6. Which among the following is a metalloid?
A) Silver
B) Copper
C) Arsenic
D) Iodine
Ans: C) Arsenic
7. Quick lime has the formula –
A) Ca(OH)2
B) Na2CO3
C) CaO
D) NaOH
Ans: C) CaO
8. Brine is a solution of
A) Sulphur in carbon disulphise
B) Potassium iodide in water
C) Iodine in alcohol
D) Sodium chloride in water
Ans: D) Sodium chloride in water
9. Alum is used –
A) in the purification of water
B) as a disinfeetant
C) as an analgesic
D) as a fertilizer
Ans: A) in the purification of water
10. The proton was discovered by
A) Thomson
B) Goldstein
C) Faraday
D) Newton
Ans: A) Thomson