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 Chemistry Questions

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Q:

Which of the following is a metal?

 

A) Sulphur B) Nitrogen
C) Oxygen D) No option is correct
 
Answer & Explanation Answer: D) No option is correct

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Q:

An element with an atomic number of ___ will form a basic oxide.

 

A) 20 B) 7
C) 6 D) 17
 
Answer & Explanation Answer: A) 20

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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 subatomic particle has a positive charge?

 

A) Proton B) Neutron
C) Electron D) Ion
 
Answer & Explanation Answer: A) Proton

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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:

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:

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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