Chemistry GK Questions and Answers for Competitive Exams
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 one of the following elements has atomicity equal to one?
(A) Oxygen
(B) Argon
(C) Nitrogen
(D) Fluorine
Correct Answer : B
Explanation :
Argon elements have atomicity equal to one.
Argon is a chemical element with the symbol Ar and atomic number 18.
It is in group 18 of the periodic table and is a noble gas.
The electron configuration of the atom with the atomic number '20' is?
(A) 2, 8, 10
(B) 2, 6, 8, 4
(C) 2, 8, 8, 2
(D) 2, 10, 8
Correct Answer : C
Explanation :
The electronic configuration of the element with atomic number 20 is 2, 8, 8, 2.
The element with an atomic number of 20 is Calcium, Ca.
The electron configuration is found using the Aufbau principle: 1s2, 2s2, 2p6, 3s2, 3p6, 4s2
It belongs to the 2nd group and 4th period.
What are the three basic components of an atom?
(A) Proton, neutron and ion
(B) Proton, neutron and electron
(C) Protium, Deuterium and Tritium
(D) Protons, neutrinos and ions
Correct Answer : B
What controls the configuration of molecular orbitals?
(A) Principal quantum number
(B) Magnetic quantum number
(C) Spin quantum number
(D) Digandhi quantum number
Correct Answer : B
What happens when an acid or a base is mixed with water?
(A) Decrease in the concentration of ions (H2O+/OH–) per unit volume
(B) Decrease in the concentration of ions (H3O+/OH–) per litre volume
(C) Increase in the concentration of ions (H3O+/OH–) per unit volume
(D) Decrease in the concentration of ions (H3O+/OH–) per unit
Correct Answer : D
Muriatic acid is another name for which compound is used in the production of chlorides, fertilisers, and dyes, in electroplating, and in the photographic, textile and rubber industries.
(A) Perchloric Acid
(B) Sulfuric acid
(C) Hydrochloric acid
(D) Nitric acid
Correct Answer : C
‘Y’ is a man-made fibre obtained from a natural source. What could be ‘Y’?
(A) Rayon
(B) Nylon
(C) Acrylic
(D) Jute
Correct Answer : A
Which of the following sets comprises liquids which are poor conductors of electricity ?
(A) tap water, shampoo, honey
(B) salt solution, lemon juice, vinegar
(C) shampoo, vegetable oil, distilled water
(D) sugar solution, vinegar, lemon juice
Correct Answer : A
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.
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Rajesh Bhatia
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