6
Q:

One method by which the components of air can be seperated is 

A) shaking with caustic soda solution B) shaking with water
C) fractional distillation of liquid air D) passing air over heated magnesium

Answer:   C) fractional distillation of liquid air



Explanation:

The two main components of air are nitrogen and oxygen. They are seperated by the fractional distillation of liquid air. Liquefied air contains liquid nitrogen and liquid oxygen. Liquid nitrogen with the lower boiling point more readily evaporates than the less volatile liquid oxygen. 

Subject: Chemistry
Q:

Which of the following is used to remove the green colour from glass?

 

A) Manganese dioxide B) Sulphur dioxide
C) Titanium dioxide D) Silicon dioxide
 
Answer & Explanation Answer: A) Manganese dioxide

Explanation:
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1 3013
Q:

Which of the following statement(s) is/are CORRECT?

 

I. Carbon compounds linked by only single bond are called saturated compounds.

II. Carbon compounds having double or triple bonds are called unsaturated compounds.

III. Saturated carbon compounds are more reactive than unsaturated carbon compounds.

 

A) Only I and II   B) Only I and III  
C) Only II and III   D) All I, II and III  
 
Answer & Explanation Answer: A) Only I and II  

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1 2396
Q:

What is the maximum number of electrons that the  outermost shell can have?

 

A) 2 B) 6
C) 8 D) none
 
Answer & Explanation Answer: C) 8

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3 2683
Q:

The first electron shell which is the nearest to the nucleus never holds more than 'n' electrons, where 'n' is equal to:

 

 

A) 8 B) 4
C) 6 D) 2
 
Answer & Explanation Answer: D) 2

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Q:

What is the atomic mass of Zirconium?

 

A) 91.22 B) 89.22
C) 88.22 D) 90.22
 
Answer & Explanation Answer: A) 91.22

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2 3815
Q:

How many types of isotopes does Scandium have?

 

A) 9 B) 7
C) 10 D) 13
 
Answer & Explanation Answer: D) 13

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2 3409
Q:

Which of the following has the lowest melting point?

 

A) Zinc B) Silver
C) Lead D) Tin
 
Answer & Explanation Answer: D) Tin

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8 6225
Q:

What is the bond angle (in degrees) in the structure of a benzene molecule?

 

A) 60   B) 150  
C) 90   D) 120
 
Answer & Explanation Answer: D) 120

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