Chemistry GK Questions and Answers for Competitive Exams
What is the mass of one mole of a substance in grams called?
(A) Nuclear mass
(B) Atomic mass
(C) Molar mass
(D) Molecular mass
Correct Answer : D
Explanation :
The mass of one mole of a substance in grams is called its molar mass.
"X" is a chemical present in our stomach and is necessary for digestion of food. When 'X' is secreted in excess, it causes health problems like indigestion. 'Y' is a chemical used to treat this condition. What could be 'X' and
(A) X is hydrochloric acid & Y is sodium carbonate.
(B) X is the milk of magnesia & Y is hydrochloric acid.
(C) X is hydrochloric acid & Y ismilk of magnesia.
(D) X is milk of magnesia & Y is ascorbic acid.
Correct Answer : C
Explanation :
Hydrochloric Acid:
It creates the acidic conditions necessary for the action of the enzyme pepsin.
The function of hydrochloric acid is to kill bacteria and pathogens. When hydrochloric acid is secreted in excess, it causes health problems like indigestion.
Excessive secretion of stomach acid can also lead to the formation of peptic ulcers.
If a person is shot with a gun and all the bullets are not removed from his body, then due to which of the following poison will spread in his body?
(A) Mercury
(B) Lead
(C) Iron
(D) Arsenic
Correct Answer : B
Explanation :
If a person is injured by shot of gun and all the bullets could not be removed it may cause poisoning by Lead As.
Which of the following will not be helpful in the process of separating a mixture of salt and water?
(A) Decantation
(B) Filteration
(C) Distillation
(D) Boiling
Correct Answer : A
Explanation :
Distillation, Boiling and Filteration (reverse osmosis) are helpful to separate the mixture of salt and water. Decantation only separates insoluble solids that settle on the bottom; thus, it cannot be used to separate a mixture of salt and water.
The atomic number of an atom of an element is 17 and the mass is 36. What is the number of neutrons in its nucleus?
(A) 17
(B) 19
(C) 36
(D) 53
Correct Answer : B
Explanation :
An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is 19.
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Rajesh Bhatia
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