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 Chemistry Questions

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Q:

Factors that may influence enzyme activity?

 

A) pH B) Substrate concentration
C) Temperature D) All the above
 
Answer & Explanation Answer: D) All the above

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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

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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

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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 

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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

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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

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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

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