Chemistry MCQ Questions with Answer
Q41. The water pollution in the river is measured by the dissolved amount of
Q42. Solder is an alloy of
(a) Tin and lead
(b) Tin and copper
(c) Tin, copper, and zinc
(d) Tin, lead, and zinc
Q43. Which one of the following noble gases are not found in the atmosphere?
Q44. Atomic size is of the order of—
(a) 10 –8 cm
(b) 10 –10 cm
(c) 10 –13 cm
(d) 10 –6 cm
Q45. Which of the following has the lowest frequency?
(a) Visible light
(b) Gamma rays
(d) Ultraviolet rays
Q46. All isotopes of the same element have —
(a) Different atomic numbers and different atomic mass
(b) Different atomic numbers and the same atomic mass
(c) The same atomic number but a different atomic mass
(d) The same atomic number and the same atomic mass
Q47. Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlight, electric shaver, etc.?
(a) Nickel and cadmium
(b) Zinc and carbon
(c) Lead peroxide and lead
(d) Iron and cadmium
Q48. Assertion (A): Large cold storage plants use ammonia as refrigerant while domestic refrigerators use chlorofluorocarbons.
Reason (R): Ammonia can be liquefied at ambient temperature and low pressure.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is NOT a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Q49. In an atom, the order of filling up of the orbitals is governed by—
(a) Aufbau principle
(b) Heisenberg’s uncertainty principle
(c) Hund’s rule
(d) Pauli’s exclusion Principle
Q50. The phenomenon of Radioactivity was discovered by –