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 Chemistry Questions

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Q:

A/an ___ flame is produced when the oxygen supply is sufficient.

 

A) red B) orange
C) blue D) green
 
Answer & Explanation Answer: C) blue

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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:

What is the purpose of adding Gypsum to the cement?

 

A) For lubrication B) To slow down its rate of setting
C) To increase its rate of setting D) To make it strong
 
Answer & Explanation Answer: B) To slow down its rate of setting

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Q:

Which of the following element is NOT a metal?

 

A) Al   B) P  
C) Ca D) K
 
Answer & Explanation Answer: B) P  

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Q:

The properties of several unknown solids were measured. Choose the correct option.

 

 

 

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

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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 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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