Chemistry Questions

Q:

The purest form of iron is 

A) wrought iron B) steel
C) pig iron D) nickel steel
 
Answer & Explanation Answer: A) wrought iron

Explanation:

Wrought Iron is the purest form of iron. It contains 0.12 to 0.25% carbon and so it is the purest form of iron.

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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

Explanation:
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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

Explanation:
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Q:

Fill in the blank with the most appropriate option.

 


An element attains stability when it achieves ________ state.

 

A) an only-duplet B) an only-octet
C) a duplet or octet D) a heptate
 
Answer & Explanation Answer: C) a duplet or octet

Explanation:
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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

Explanation:
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Q:

The formula C6H14 represents the hydrocarbon ___.

 

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

Explanation:
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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  

Explanation:
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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

Explanation:
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