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Q:

Group 8A of the periodic table contains the

 

A) least reactive metals B) most reactive nonmetals
C) most reactive metals D) least reactive nonmetals
 
Answer & Explanation Answer: D) least reactive nonmetals

Explanation:

Helium (He), Neon(Ne), Argon(Ar), Krypton (Kr), Xenon (Xe), Radon (Rn) and Ununoctium (Uuo) are present group 8A.

 

They have fully filled orbitals and hence are most stable amongst all the elements in the periodic table and are considered as least reactive least reactive non-metals.

 

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Q:

Elements having same atomic numbers but different mass number are called ______.

 

 

A) isotones B) Isotopes
C) isomopes D) isobar
 
Answer & Explanation Answer: B) Isotopes

Explanation:
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Q:

Consider the following constituent gases of the atmosphere :

1. Argon

2. Neon

3. Helium

4.Ceirbon dioxide

Which one of the following is the correct ascending sequence of the above gases in terms of the volume percentage?

A) 1-3-2-4 B) 1-4-2-3
C) 4-2-3-1 D) 2-4-1-3
 
Answer & Explanation Answer: B) 1-4-2-3

Explanation:
Composition of Dry Air (Substance, % by volume)
Nitrogen, N2 78.08
Oxygen, O2
20.95
Argon, Ar 0.93
Carbon dioxide, CO2 0.033
Neon, Ne 0.0018
Helium, He 0.00052
Methane, CH4 0.0002
Krypton, Kr 0.00011
Dinitrogen oxide, N2O 0.00005
Hydrogen, H2 0.00005
Ozone, O3 0.000001
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Q:

What is formed when helium atom loses one electron?

 

A) Proton B) Positive helium ion
C) Negative helium ion D) Alpha particle
 
Answer & Explanation Answer: B) Positive helium ion

Explanation:
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Q:

Milk of Magnesia is used as a 

 

A) Laxative  B) Pain killer 
C) Sedative  D) Antibiotic
 
Answer & Explanation Answer: A) Laxative 

Explanation:
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Q:

Isotopes have ______.

 

I. similar physical quantities and different chemical properties

II. different physical properties

III. similar chemical properties

 

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

Explanation:
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Q:

Which type of reaction occurs when carbon burns in oxygen to give carbo dioxide?

 

A) Addition reaction B) Substition reaction
C) Combustion reaction D) Decomposition reaction
 
Answer & Explanation Answer: C) Combustion reaction

Explanation:
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Q:

___ is the number of shells for elements of the 3rd period.

 

A) 1 B) 0
C) 2 D) 3
 
Answer & Explanation Answer: D) 3

Explanation:
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