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 Chemistry Questions

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Q:

What determines the mass number of an element?

A) Number of protons B) Number of electrons and protons
C) Number of protons and neutrons D) Number of neitrons
 
Answer & Explanation Answer: C) Number of protons and neutrons

Explanation:

The number of protons in an isotope or an atom gives its atomic number whereas the number of protons and neutrons gives its mass number.

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Q:

Magnesium (Mg) + Oxygen (O2) = ?

A) Mg2O B) MgO4
C) O2Mg D) MgO
 
Answer & Explanation Answer: D) MgO

Explanation:
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Q:

The most extensive use of molasses after fermentation is for producing

A) Methanol B) Sugar
C) Ethanol D) Sugarcane
 
Answer & Explanation Answer: C) Ethanol

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Q:

Which  one  of  the  following  statements  is not correct?

A) The    cathode    rays    originate    from cathode   and   proceed   towards   the anode   in   a   cathode-ray   discharge tube. B) The television picture tubes are nothing but cathode ray tubes.
C) The  cathode  rays  themselves  are  not visible. D) The   characteristics   of   cathode   rays depend  upon  the  nature  of  the  gas present in the cathode-ray tube.
 
Answer & Explanation Answer: D) The   characteristics   of   cathode   rays depend  upon  the  nature  of  the  gas present in the cathode-ray tube.

Explanation:

Cathode ray is a beam of electrons emitted   from   the   cathode   of   a vacuum    tube.    It    is    invisible. Cathode  ray  tubes  are  also  found in     televisions     and     computer monitors.  Since  cathode  ray  is  a beam of electrons and all electrons are  identical,  charge  to  mass  ratio is same for all the gases and does not depend on the nature of gas.

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Q:

The number of electron levels in a magnesium atom is

A) 3 B) 2
C) 1 D) 0
 
Answer & Explanation Answer: A) 3

Explanation:
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Q:

The compound used in prickly-­heat powder to prevent excessive sweating is

A) Boric acid B) Phosphoric acid
C) Carbonic acid D) Sulphonic acid
 
Answer & Explanation Answer: A) Boric acid

Explanation:
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Q:

Which among the following has the maximum density?

A) Water B) Ice
C) Ethylene D) Acetone
 
Answer & Explanation Answer: A) Water

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Q:

The first two steps in the lithification process are

A) Cementation and Proposal B) Compaction and Ratification
C) Compaction and Cementation D) Ratification and Cementation
 
Answer & Explanation Answer: C) Compaction and Cementation

Explanation:

The first two steps in the lithification process are Compaction and Cementation.

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