19
Q:

The fundamental particles present in equal numbers in neutral atoms are

A) protons and electrons B) neutrons and electrons
C) protons and neutrons D) protons and positrons

Answer:   A) protons and electrons



Explanation:
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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5 4966
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 4323
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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4 5306
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 1000
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 6539
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 5795
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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9 8442
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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