Top 50 Chemistry GK Questions and Answers
Thin wires can be drawn from a piece of metal. Which property of the metal is it responsible for?
(A) ductility
(B) hardness
(C) malleability
(D) conductivity
Correct Answer : A
Explanation :
The property of metal by which it can be drawn into wires is called ductility.
Food is cooked in a metal utensil because it is the source of heat.
(A) is a good conductor
(B) is a semiconductor
(C) is a bad conductor
(D) is both a conductor and a good conductor
Correct Answer : A
Melting and boiling points of ionic compounds -
(A) contains the following
(B) are high
(C) are normal
(D) All the statements are true
Correct Answer : B
Which metal can be cut with a knife among sodium, lithium, calcium and nickel?
(A) Sodium
(B) Lithium
(C) calcium
(D) all
Correct Answer : A
Explanation :
Alkali metals (lithium, sodium, potassium) are so soft that they can be cut with a knife. The freshly cut surface is a shiny, silver colour, but this tarnishes quickly to a dull grey as the metal reacts with oxygen and water in the air.
Silver and copper heat?
(A) are the best drivers
(B) are less conductors
(C) are dielectrics
(D) is the best conductor
Correct Answer : A
(A) a nonpolar molecule with polar bonds
(B) a nonpolar molecule with nonpolar bonds
(C) a polar molecule with polar bonds
(D) a polar molecule with nonploar bonds
Correct Answer : A
Explanation :
Answer: A) a nonpolar molecule with polar bonds Explanation: The four bonds of carbon tetrachloride (CCl4) are polar, but the molecule is nonpolar because the bond polarity is cancelled by the symmetric tetrahedral shape. Hence, making the net dipole as zero and molecule as non-polar. When other atoms substitute for some of the Cl atoms, the symmetry is broken and the molecule becomes polar.
In which state of matter, the distance between the molecules is minimum ?
(A) Solid
(B) Liquid
(C) Gas
(D) Plasma
Correct Answer : A
Which energy is converted into electrical energy by a solar cell?
(A) Chemical Energy
(B) Nuclear energy
(C) Solar energy
(D) Magnetic energy
Correct Answer : C
Atomic number of which of the following elements is greater than that of Copper?
(A) Zinc
(B) Manganese
(C) Iron
(D) Chromium
Correct Answer : A
Methane an air pollutant is produced ___________
(A) by burning of coal in insufficient air
(B) by digestion of food by animals
(C) by action of ultraviolet light on nitrogenous compounds.
(D) as a by-product of manufacturing ammoniacal fertilizers
Correct Answer : B
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Rajesh Bhatia
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