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 Chemistry Questions

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Q:

In water treatment plant, use of chloramines ensures __________

A) taste and odour control B) weed control in reservoirs
C) disinfection D) removal of permanent hardness
 
Answer & Explanation Answer: C) disinfection

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Q:

Which of these is not a macronutrient for Plants?

A) Nitrogen B) Phosphorus
C) Potassium D) Chlorine
 
Answer & Explanation Answer: D) Chlorine

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Q:

Which of the following gases is known as "Laughing Gas"?

A) Nitrous oxide B) Nitrogen peroxide
C) Nitrogen D) Nitric oxide
 
Answer & Explanation Answer: A) Nitrous oxide

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Q:

What is the chemical formula of Ozone?

A) O B) O2
C) O3 D) O4
 
Answer & Explanation Answer: C) O3

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Q:

What happens as we go down the group in the periodic table?

A) The number of shells decreases B) Valence electrons decreases
C) The number of shells increases D) Atomic size decreases
 
Answer & Explanation Answer: C) The number of shells increases

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Q:

A) Mineral B) Tribe
C) Grass D) Town
 
Answer & Explanation Answer: C) Grass

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Q:

Which among the following is used to generate light, to weld metals?

A) Ethylene B) Acetylene
C) Glycol D) Oxalic acid
 
Answer & Explanation Answer: B) Acetylene

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Q:

Which of the following elements has the lowest melting point?

A) Helium B) Potassium
C) Tungsten D) Sulphur
 
Answer & Explanation Answer: A) Helium

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