822
Q:

The purest form of iron is 

A) wrought iron B) steel
C) pig iron D) nickel steel

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.

Subject: Chemistry
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Q:

What happens when dilute hydrochloric acid is added to iron filings?

 

A) Only chloride are produced B) Hydrogen gas and iron chloride are produced
C) No reaction take place D) Only hydrogen gas is produced
 
Answer & Explanation Answer: B) Hydrogen gas and iron chloride are produced

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0 17
Q:

An element having atomic number 17 will resemble which of the following elements having Atomic number as given below?

 

A) 33 B) 34
C) 18 D) 34
 
Answer & Explanation Answer: D) 34

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1 70
Q:

The 4th and 5th periods contain:

 

A) 8 elements B) 18 elements
C) 11 elements D) 9 elements
 
Answer & Explanation Answer: B) 18 elements

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1 72
Q:

Which of the following can undergo sublimation?

 

A) Ammonium chloride B) Ammonium chlorate
C) Ammonium sulphate D) Ammonium phosphate
 
Answer & Explanation Answer: A) Ammonium chloride

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1 32
Q:

What is mixing an acid with water that results in a decrease in the concentration of ions per unit volume called?

 

A) Dilution B) Neutralisation
C) Acidification D) Concentration
 
Answer & Explanation Answer: A) Dilution

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0 57
Q:

Which of the following is used for removing permanent hardness of water?

 

A) Lime   B) Washing soda  
C) Bleaching powder   D) Baking soda  
 
Answer & Explanation Answer: B) Washing soda  

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0 72
Q:

Which of the following gases is consistently seen to be most abundant in a volcanic eruption?

 

A) Sulphur Dioxide B) Carbon Dioxide
C) Water vapour D) Hydrogen Sulphide
 
Answer & Explanation Answer: C) Water vapour

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0 77
Q:

Name the only metal that is antibacterial.

 

A) Iron B) Sodium
C) Aluminium D) Copper
 
Answer & Explanation Answer: D) Copper

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0 101