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 Chemistry Questions

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Q:

Non metal found in liquid state?

A) Chlorine B) Bromine
C) Fluorine D) Iodine
 
Answer & Explanation Answer: B) Bromine

Explanation:

Bromine is the Non metal found in liquid state.

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Q:

Which among the following will be a negative ion?

A) If it has more electrons than protons B) If it has more electrons than neutrons
C) If it has more protons than electrons D) If it has more protons than neutrons
 
Answer & Explanation Answer: A) If it has more electrons than protons

Explanation:
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Q:

What is the chemical formula of aluminium nitride?

A) AlN B) Al2N
C) AlN2 D) AlN3
 
Answer & Explanation Answer: A) AlN

Explanation:
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Q:

Which element has the lowest ionization energy?

A) He B) Ne
C) Fr D) Rb
 
Answer & Explanation Answer: C) Fr

Explanation:

Ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms. Atoms are more stable when they have full valence shells.


The ionization energy decreases from top to bottom in groups, and increases from left to right across a period.

 

HGence, in this trend Francium (Fr) has the lowest ionization energy.

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Q:

Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?

 

A) Element with 18 neutrons and 20 protons  B) Element with 19 neutrons and 18 protons 
C) Element with 19 neutrons and 20 protons  D) Element with 18 neutrons and 22 neutrons
 
Answer & Explanation Answer: D) Element with 18 neutrons and 22 neutrons

Explanation:
Isobar: one of two or more atoms having equal atomic weights but different atomic numbers.
 
                    Mass number     Electrons      Neutrons
    Calcium            40                    20                 20
 
     Argon              40                    18                 22
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Q:

Which among the following is false about alpha particles?

A) They have high ionizing power B) They have high penetrating power
C) They have high kinetic energy D) They are positively charged helium nuclei
 
Answer & Explanation Answer: B) They have high penetrating power

Explanation:
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Q:

At low temperature, Lead behaves as a :

A) Semi conductor B) Super conductor
C) Insulator D) Conductor
 
Answer & Explanation Answer: B) Super conductor

Explanation:
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Q:

The complexity and variety of organic molecules is due to

A) their interaction with water B) their tremendously large sizes
C) the chemical versatility of carbon atoms D) the variety of rare elements in organic molecules
 
Answer & Explanation Answer: C) the chemical versatility of carbon atoms

Explanation:

The complexity and variety of organic molecules is due to the chemical versatility of carbon atoms.

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