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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

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1 1880
Q:

The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its ___________.

A) Crystallisation B) Melting point
C) Evaporation D) Galvanisation
 
Answer & Explanation Answer: B) Melting point

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0 1877
Q:

What is an exothermic reaction?

A) Reaction in which heat is released. B) Reaction in which heat is absorbed.
C) Reaction in which neither heat is released nor absorbed. D) None
 
Answer & Explanation Answer: A) Reaction in which heat is released.

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3 1876
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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0 1872
Q:

What is the common name of Sodium Bicarborate?

A) Baking Soda B) Washing Powder
C) Plaster of Paris D) Fly Ash
 
Answer & Explanation Answer: A) Baking Soda

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3 1867
Q:

Calcium salts used as fertilizer is:

A) Calcium Carbide B) Calcium Carbonate
C) Calcium Cyanide D) Calcium Sulphate
 
Answer & Explanation Answer: D) Calcium Sulphate

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3 1862
Q:

Which properties are characteristic of the group 1 metals?

A) Low melting points B) Produce hydrogen when react with water
C) Soft in nature D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Group 1 metals are also called as alkali metals with reactive in nature and low melting points. They are soft and produce hydrogen and alkaline metal hydroxide solution when they react with water.

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0 1858
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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2 1858