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 Chemistry Questions

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Q:

________ is made by mixing iron with carbon and metals like chromium, nickel and manganese.

A) Ship B) Stainless Steel
C) Rust D) Ozone
 
Answer & Explanation Answer: B) Stainless Steel

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Q:

Alcohol is more volatile than water because _________ is lower than water

A) its boiling point B) its density
C) its viscosity D) its surface tension
 
Answer & Explanation Answer: A) its boiling point

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Q:

An ∝ particle is _____.

A) A hydrogen molecule B) A helium nucleus
C) An atom of hydrogen D) A proton
 
Answer & Explanation Answer: B) A helium nucleus

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Q:

Ozone is an ______ of oxygen.

A) Allotrope B) Isotope
C) Isobar D) Isotone
 
Answer & Explanation Answer: A) Allotrope

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Q:

Group 7A of the periodic table contains the

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

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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 of the following is a chemical formula of quicklime?

A) Ca2O B) Ca2CO3
C) CaO2 D) CaO
 
Answer & Explanation Answer: D) CaO

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Q:

Which of the following is also known as Carbolic Acid?

A) Phenol B) Hydroxide
C) Sulphuric Acid D) Ethanol
 
Answer & Explanation Answer: A) Phenol

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