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:

What is the chemical name of the deadly poison 'cyanide'?

 

A) Prussic acid B) Sulfuric acid
C) Hydrochloric acid D) Nitric acid
 
Answer & Explanation Answer: A) Prussic acid

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Q:

Blue litmus paper turns ____ on contact with an acidic solution.

 

A) green B) red
C) yellow D) brown
 
Answer & Explanation Answer: B) red

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Q:

What is the dominant chemical present in detergent powder?

 

A) Calcium carbonate B) Sodium alkyl sulphate
C) Hydrochloric acid D) Sodium carbonate
 
Answer & Explanation Answer: D) Sodium carbonate

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Q:

Nitrous Oxide' is the chemical name of ______.

 

A) Tear Gas B) Fire Extinguisher
C) Laughing Gas D) Mosquito Repellent
 
Answer & Explanation Answer: C) Laughing Gas

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Q:

_____ gases trap heat in the atmosphere which makes the Earth warmer, causing global warming.

 

A) Greenhouse B) Nobel
C) Elemental D) Compound
 
Answer & Explanation Answer: A) Greenhouse

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Q:

Calcium Sulphate dihydrate is commonly known as ________.

 

A) gypsum B) glass
C) asbestos D) limestone
 
Answer & Explanation Answer: A) gypsum

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Q:

What is the more common name for solid carbon dioxide?

 

A) Epsom B) Dry Ice
C) Potash D) Quick Silver
 
Answer & Explanation Answer: B) Dry Ice

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Q:

Which of the following is the major component of vinegar?

 

A) Citric acid B) Lactic acid
C) Nitric acid D) Acetic acid
 
Answer & Explanation Answer: D) Acetic acid

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