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 Chemistry Questions

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Q:

What enables an electric current to flow in a circuit?

 

A) The motion of electrons B) The motion of neutrons
C) The motion of positrons D) The motion of protons
 
Answer & Explanation Answer: A) The motion of electrons

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Q:

Which of the following is a property of an acid?

 

A) Acids reacts with metals B) Acids taste sour
C) Acids turn blue litmus paper red D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

The general properties of acids are as follows :-

1.They are sour to taste.

2.They turn blue litmus paper red but the red litmus paper have no effect of acids and it remains unaffected.

3.They release hydrogen ions H+ in the solution medium, making the conditions acidic.

 

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Q:

Which one of the following is not a mixture

A) air B) mercury
C) milk D) cement
 
Answer & Explanation Answer: B) mercury

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Q:

Among the given nutrients, milk is a poor source of

A) Calcium B) Protein
C) Vitamin C D) Carbohydrates
 
Answer & Explanation Answer: C) Vitamin C

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Q:

Which of the following is used as a catalyst in the hydrogenation of vegetable oil?

 

A) He B) H2
C) Ni D) Pb
 
Answer & Explanation Answer: C) Ni

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Q:

Consider the following constituent gases of the atmosphere :

1. Argon

2. Neon

3. Helium

4.Ceirbon dioxide

Which one of the following is the correct ascending sequence of the above gases in terms of the volume percentage?

A) 1-3-2-4 B) 1-4-2-3
C) 4-2-3-1 D) 2-4-1-3
 
Answer & Explanation Answer: B) 1-4-2-3

Explanation:
Composition of Dry Air (Substance, % by volume)
Nitrogen, N2 78.08
Oxygen, O2
20.95
Argon, Ar 0.93
Carbon dioxide, CO2 0.033
Neon, Ne 0.0018
Helium, He 0.00052
Methane, CH4 0.0002
Krypton, Kr 0.00011
Dinitrogen oxide, N2O 0.00005
Hydrogen, H2 0.00005
Ozone, O3 0.000001
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Q:

Which of the following pairs is INCORRECT?

I. Haematite : Iron

II. Pitchblende : Copper

III. Monazite : Thorium

A) Only I B) Only II
C) Only I and Only II D) Only I and Only III
 
Answer & Explanation Answer: B) Only II

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Q:

The electronic dot and cross structure of ethene is ............

 

A) B)
C) D)
 
Answer & Explanation Answer: C)

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