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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:

An ionic bond involves _____.

 

A) the sharing of a single pair of electrons B) an attraction between ions of opposite charge
C) the unequal sharing of an electron pair D) water avoidance
 
Answer & Explanation Answer: A) the sharing of a single pair of electrons

Explanation:

In ionic bonding, the atoms are bound by attraction of oppositely charged ions, whereas, in covalent bonding, atoms are bound by sharing electrons to attain stable electron configurations.

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Q:

The activation energy for the reverse reaction is represented by

 

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

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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:

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:

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:

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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