2
Q:

If people sleep in closed rooms where charcoal fire is burning , they die due to 

A) carbon monoxide B) carbon dioxide
C) methane D) phosgene

Answer:   A) carbon monoxide



Explanation:

A closed room is aplace where charcoal is burnt in limited supply of air. There is every chance for the formation of the deadly poisonous carbon monoxide, which when inhaled, reacts with the iron in haemoglobin of blood and prevents the supply of oxygen. It is said to be treacherous as there can be no previous warning of its presence because it is an odourless and colourless gas.

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

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1 2948
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 2313
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 2482
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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3 760
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 3625
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 3210
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 6089
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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