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 Chemistry Questions

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Q:

The percentage of nitrogen in the air is about

A) 74% B) 76%
C) 78% D) 80%
 
Answer & Explanation Answer: C) 78%

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Q:

What is used to prevent freezing of fuel in space crafts?

A) Benzene B) Glycol
C) Acetylene D) Ester
 
Answer & Explanation Answer: B) Glycol

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Q:

Which gas is released when water is added to bleaching powder?

A) Oxygen B) Hydrogen
C) Carbon dioxide D) Chlorine
 
Answer & Explanation Answer: D) Chlorine

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Q:

............. elements have the largest atoms

A) F B) O
C) H D) Li
 
Answer & Explanation Answer: D) Li

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Q:

Which among the following is false about acids?

A) They give H+ ions in aqueous solution B) Most acids contain hydrogen
C) They turn blue litmus red D) They are bad conductor of electricity in aqueous solution
 
Answer & Explanation Answer: D) They are bad conductor of electricity in aqueous solution

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Q:

Which element is generally No Radioactive?

A) Thorium B) Polonium
C) Germanium D) Plutonium
 
Answer & Explanation Answer: C) Germanium

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Q:

Which among the following is false about viscosity?

A) Viscosity of gases is less than that of liquids B) Viscosity of gases increases with rise in temperature
C) Viscosity of liquid decreases with rise in temperature D) Viscosity of liquid decreases with increase in pressure
 
Answer & Explanation Answer: D) Viscosity of liquid decreases with increase in pressure

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Q:

An acid can be defined as

Answer

An acid can be defined as a molecule or other species which can donate a proton or accept an electron pair in reactions.


(OR)


A substance with particular chemical properties including turning litmus red, neutralizing alkalis, and dissolving some metals; typically, a corrosive or sour-tasting liquid of this kind.

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