Q51. Which of the following has the lowest melting point?
[A] Silver
[B] Lead
[C] Tin
[D] Zinc
Q52. Which one of the following substances does not have a melting point
[A] glass
[B] Mercury
[C] bromine
[D] sodium chloride
Q53. Which of the following metal finds its use as a radiocontrast agent in X-ray imaging?
[A] Titanium
[B] Lithium
[C] Barium
[D] Scandium
Q54. ________ is the metal used for making filaments of electric bulbs.
[A] Nickel
[B] Iron
[C] Silver
[D] Tungsten
350+ Chemistry Quiz Questions and Answers
Q55. What is the hemihydrate of calcium sulphate commonly known as?
[A] Chloroform
[B] Plaster of Paris
[C] Limestone
[D] Gypsum
Q56. Many marine animals use _________ dissolved in sea-water to make their shells.
[A] silica
[B] carbonates
[C] acids
[D] alkalis
Q57. Which of the following group is NOT Dobereiner Triads?
[A] Cl, Br, I
[B] Ca, Sr, Ba
[C] N, P Au
[D] Li, Na, K
Q58. Which among the following is major component of Gobar Gas?
[A] Methane
[B] Butane
[C] Propane
[D] Ethane
Q59. Cobalt – 60 is commonly used in radiation therapy because it emits
[A] gamma rays
[B] alpha – rays
[C] X – rays
[D] beta rays
Q60. NH3 oxidation number?
[A] +1
[B] 0
[C] -1
[D] -3