Chemistry Questions

Q:

Elements A, B and C occur as Dobereiners triads. If the atomic mass of A is 7 and that of C is 39, what will be the atomic mass of B?

A) 20 B) 40
C) 23 D) 12
 
Answer & Explanation Answer: A) 20

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Q:

What chemical is injected into a person's body when an ant bites?

A) Formic Acid B) Acetic Acid
C) Tartaric Acid D) Citric Acid
 
Answer & Explanation Answer: A) Formic Acid

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Q:

Which of the following has pH value 7?

A) Pure Water B) H2SO4
C) Sodium Carbonate D) HCl
 
Answer & Explanation Answer: A) Pure Water

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Q:

What is contained in Chlorophyll ?

A) sodium B) potassium
C) manganese D) magnesium
 
Answer & Explanation Answer: D) magnesium

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Q:

Which of the following is most important for absorption of heat radiated from the Sun as well as from the Earth?

A) Carbon dioxide B) Oxygen
C) Carbon monoxide D) Nitrogen
 
Answer & Explanation Answer: A) Carbon dioxide

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Q:

A solution that is at equilibrium must be

A) saturated B) concentrated
C) unsaturated D) dilute
 
Answer & Explanation Answer: A) saturated

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Q:

Which of the following is not a component of Smog?

A) Volatile organic compounds B) Nitrogen Oxide
C) Sulphur dioxide D) Chlorine oxide
 
Answer & Explanation Answer: D) Chlorine oxide

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Q:

Give an example of a salt which gives an aqueous solution of pH less than 7.

A) Ammonium chloride B) Sodium carbonate
C) Sodium bicarbonate D) Sodium chloride
 
Answer & Explanation Answer: A) Ammonium chloride

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