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Practice MCQ Questions and answers on Chemistry-GK

Learn and practice General Knowledge questions and answers on Chemistry with very easy and understandable explanations. GK questions are very helpful different type of competitive exams. Page-7 section-1

Each section contains 100 MCQs on Chemistry .
61
The hardest form of carbon is
Discuss
Answer & Solution
Answer: Option C
Solution:
The allotropes of carbon include graphite, one of the softest known substances, and diamond, the hardest naturally occurring substance.
62
The most important ore of aluminium is
Discuss
Answer & Solution
Answer: Option A
Solution:
Bauxite is the most common aluminum ore.
63
The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an example of
Discuss
Answer & Solution
Answer: Option B
Solution:
The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an example of a condensation reaction.
64
The number of electrons presents in H+ is
Discuss
Answer & Solution
Answer: Option A
Solution:
H+ is a hydrogen ion, and it is an ion because it LOST an electron. Electrons are negatively charged. When an atom gains electrons it will have NEGATIVE charges.

So it has zero electron.
65
The hottest part of the gas flame is known as
Discuss
Answer & Solution
Answer: Option A
Solution:
The hottest part of the gas flame is known as luminous zone.
66
The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is
Discuss
Answer & Solution
Answer: Option C
Solution:
The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is Oxygen.
67
The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is
Discuss
Answer & Solution
Answer: Option C
Solution:
The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is positional isomerism.
68
The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?
Discuss
Answer & Solution
Answer: Option C
Solution:
The half life period of an isotope is 2 hours. After 6 hours 1/8 of the original amount, or 12.5% of the isotope will be left behind.
69
The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3
Discuss
Answer & Solution
Answer: Option A
Solution:
The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3 is 4.
70
The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in
Discuss
Answer & Solution
Answer: Option B
Solution:
The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in 12 moles of KMnO4.