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 Chemistry Questions

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Q:

What is the systematic name of NH4ClO3?

A) Ammonium Chloride B) Ammonium Chlorate
C) Ammonium Chlorane D) Ammonium Chlorine
 
Answer & Explanation Answer: B) Ammonium Chlorate

Explanation:

In common we all call the systematic name of NH4ClO3 as Ammonium Chlorate. But originally the systematic name is azanium trioxidochlorate.

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5 5036
Q:

The element that has the highest first ionization potential is.......

A) Oxygen B) Carbon
C) Boron D) Nitrogen
 
Answer & Explanation Answer: D) Nitrogen

Explanation:
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9 4999
Q:

Oxidation Number of 'S' in H2SO4?

A) +6 B) +2
C) -6 D) -2
 
Answer & Explanation Answer: A) +6

Explanation:

In H2SO4,

Hydrogen has a charge of +2, with each hydrogen has +1.

Oxygen has  a charge of -8, with each oxugen has -2.

Total charge = (2 - 8) = -6

Therefore, the Oxidation number of Sulphur S is '+6' because to make the compound stable.

 

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11 4932
Q:

The substances that are composed of to or more different elements in fixed proportion by mass are called

A) mixture B) compound
C) element D) None of these
 
Answer & Explanation Answer: B) compound

Explanation:
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5 4928
Q:

Who present the theory of radioactive disintegration

A) Rutherford and Soddy B) Soddy and Fajan
C) Thomson and Rutherford D) Hahn and strassman
 
Answer & Explanation Answer: A) Rutherford and Soddy

Explanation:
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7 4910
Q:

'Minamata' disease was caused by ?

A) Lead B) Mercury
C) Cadmium D) Zinc
 
Answer & Explanation Answer: B) Mercury

Explanation:
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11 4894
Q:

Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of :

A) An acetylenic triple bond B) Two ethylenic double bonds
C) A vinyl group D) An isopropyl group
 
Answer & Explanation Answer: C) A vinyl group

Explanation:

C=}CH2→OzonolysisHCHO

Vinylic group.

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3 4871
Q:

Which statement about electrons and atomic orbitals is NOT true?

A) An orbital can contain a minimum of two electrons B) An electron has the same amount of energy in all orbitals
C) An atom’s lowest energy level has only two orbitals D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Yes, all the given statements are NOT true about electrons and atomic orbitals.

 

True statements are ::

 

An orbital can contain a maximum of two electrons.

An atom’s lowest energy level has only one orbital.

An electron has different amount of energies in all orbitals.

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