Q41. ‘Misch metal’ is widely used in manufacture of which of the following
[A] Smoke detectors
[B] Cigarette lighters
[C] Emergency lights
[D] Material of car brake
Q42. The formula of lithium nitride is:
[A] LiN
[B] Li2N
[C] Li3N
[D] Li3N2
Q43. How many electrons are there in Na+
[A] 10
[B] 11
[C] 1
[D] 12
Q44. The M.K.S. system was first introduced by
[A] Giorgi
[B] Newton
[C] Archimedes
[D] Einstein
300+ Chemistry Quiz Questions and Answers
Q45. When water freezes its density?
[A] become zero
[B] increases
[C] decreases
[D] remains constant
Q46. How many carbon and hydrogen atoms are there in Propane, respectively?
[A] 2, 6
[B] 4, 7
[C] 3, 8
[D] 2, 4
Q47. Which of the following solutions will be more Acidic?
[A] pH = 0
[B] pH = 1
[C] pH = 2
[D] pH = 6
Q48. The electrochemical cell stops working after some time because _________
[A] One of electrodes completely vanishes
[B] Electrode potential of both electrodes equalizes
[C] Electrode potential of both the electrodes becomes zero
[D] The reaction reverses its direction
Q49. Temporary hardness is due to the presence of
[A] calcium sulphate
[B] magnesium sulphate
[C] Calcium carbonate
[D] calcium bicarbonate
Q50. Sodium carbonate crystal lose water molecules this property is called
[A] hygroscopy
[B] efflorescence
[C] deliquescence
[D] None of these