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Q:

Isobars are atoms of different chemical elements that have ______.

 

A) Same atomic number but different mass number B) Same mass number but different atomic number
C) Same mass number and same atomic number D) Different mass number and different atomic number  
 
Answer & Explanation Answer: B) Same mass number but different atomic number

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Q:

Among the given nutrients, milk is a poor source of

A) Calcium B) Protein
C) Vitamin C D) Carbohydrates
 
Answer & Explanation Answer: C) Vitamin C

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Q:

The most abundant of the rare gases i ?

 

A) Helium B) Argon
C) Neon D) Nitrogen
 
Answer & Explanation Answer: B) Argon

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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:

Find the similarity in the following :

 

Carbon, Silicon, Boron, Arsenic

 

A) All of them are gases B) All of them are non-metals
C) All of them are metals D) No similarity
 
Answer & Explanation Answer: B) All of them are non-metals

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Q:

The vast amount of sea weeds present in oceans may produce an endless source of

 

A) Methane B) Ocean thermal energy
C) Sea wave energy D) Nuclear energy
 
Answer & Explanation Answer: A) Methane

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Q:

An electron loses potential energy when it

 

A) shifts to a more electronegative atom. B) increases its kinetic energy.
C) shifts to a less electronegative atom. D) increases its activity as an oxidizing agent.
 
Answer & Explanation Answer: A) shifts to a more electronegative atom.

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Q:

____ are atoms/molecules/ions containing the same number of electrons.

 

A) Isotones B) Isotopes
C) Isoelectronic D) Valence Isoelectronic  
 
Answer & Explanation Answer: C) Isoelectronic

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