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 Chemistry Questions

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Q:

Which of the following is an example of compound?

 

A) Manganese B) Air
C) Ozone D) Ammonia gas
 
Answer & Explanation Answer: D) Ammonia gas

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Q:

Which of the following has largest atomic radius?

 

A) Li B) Be
C) B D) O
 
Answer & Explanation Answer: A) Li

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Q:

The formula C6H14 represents the hydrocarbon ___.

 

A) Hexene B) Heptyne
C) Hexane D) Hexyne
 
Answer & Explanation Answer: C) Hexane

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Q:

Which of the following statements is INCORRECT?

I) Bleaching powder is a pale yellow powder

II) Dry NH3 gas turns red litmus blue

III) The pH of rain water is nearly 7

IV) The pH of acid rain is nearly 5.6

 

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

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Q:

Charge on proton is equal to the charge on ______.

 

A) Electron B) Positron
C) Neutron D) Alpha particle
 
Answer & Explanation Answer: B) Positron

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Q:

Isotopes of an element have ______.

 

A) Same physical properties B) Different chemical properties
C) Different number of neutrons D) Different atomic number
 
Answer & Explanation Answer: C) Different number of neutrons

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Q:

How many molecules are present in one mole of water?

 

A) 6.02 x 1023 molecules B) 6.02 x 1026 molecules
C) 8.02 x 1022 molecules D) 7.02 x 1023 molecules
 
Answer & Explanation Answer: A) 6.02 x 1023 molecules

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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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