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Q:

The maximum number of electrons that can be accommodated in a shell depends on the formula

 

A) 1n2 B) n2
C) 3n2 D) 2n2

Answer:   D) 2n2



Explanation:
Subject: Chemistry
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For dilution of a concentrated acid, we should add:

A) water into the diluted acid B) water into the concentrated acid
C) first water into the acid and then more acid into the water D) concentrated acid into water
 
Answer & Explanation Answer: B) water into the concentrated acid

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Which of the following is a correct pair according to increasing atomic number from left to right?

A) He, H B) Na, Ne
C) Be, B D) Ca, Cl
 
Answer & Explanation Answer: C) Be, B

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Q:

Fill in the blank with the most appropriate option.

 

Ethanol is denatured to ___.

 

A) make it unsuitable for drinking B) make it suitable for drinking
C) increase its stability D) make it suitable as an antiseptic
 
Answer & Explanation Answer: A) make it unsuitable for drinking

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Q:

By volume, 21% of air is _______________.

 

A) hydrogen B) oxygen
C) nitrogen D) carbon dioxide
 
Answer & Explanation Answer: B) oxygen

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Q:

Which of the following statements are CORRECT?

 


I. The soap molecules form structures called micelles.


II Soap micelles cannot scatter light.


III. Oily dirt gets collected in the center of the micelle.

 

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

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1 3440
Q:

Isotopes of an element have ______.

 

A) Same physical properties B) Different chemical properties
C) Different number of neutrons D) Different atomic number
 
Answer & Explanation Answer: C) Different number of neutrons

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1 1364
Q:

____ is the process in which acids and bases react to form salts and water.

A) Distillation B) Electrolysis
C) Neutralisation D) Hydrolysis
 
Answer & Explanation Answer: C) Neutralisation

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1 179
Q:

Which among the following noble gas has highest molar mass?

 

A) Kr   B)  Ne  
C)  Ar   D)  Xe
 
Answer & Explanation Answer: D)  Xe

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