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 Chemistry Questions

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Q:

The mass of one molecule of oxygen is

 

A) 2.3 x 10-23 g B) 3.3 x 10-23 g
C) 4.3 x 10-23 g D) 5.3 x 10-23 g
 
Answer & Explanation Answer: D) 5.3 x 10-23 g

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Q:

Which substance is produced when alcohol is added with petrol and used as a fuel?

 

A) Only oxygen B) Only carbon-dioxide
C) Only water D) Carbon-dioxide and water both
 
Answer & Explanation Answer: B) Only carbon-dioxide

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Q:

Which of the following causes acid rain?

I. SO2

II. NO2

III. CO2

 

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

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Q:

Which of the following statements are CORRECT?

 


I. The soap molecules form structures called micelles.


II Soap micelles cannot scatter light.


III. Oily dirt gets collected in the center of the micelle.

 

A) Both I and II B) Both I and III
C) Both II and III D) All I, II and III
 
Answer & Explanation Answer: B) Both I and III

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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:

Which of the following is a non metal that remains liquid at room temperature  ?

A) Chlorine B) Phosphorous
C) Bromine D) Helium
 
Answer & Explanation Answer: C) Bromine

Explanation:

The chemical element with the atomic number 35, Bromine is a non metal that remains liquid at room temperature. Mercury also remains liquid at room temperature but it is a metal. Bromine is the third lightest halogen.

 

Which_of_the_following_is_a_non_metal_that_remains_liquid_at_room_temperature1542256555.jpg image

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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 is released during the formation of a peptide bond?

 

 

A) an amino group B) a five-carbon sugar
C) both 1 and 2 D) a water molecule
 
Answer & Explanation Answer: D) a water molecule

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