41. 4th and 5th period of the long form of the periodic table are called?
(A) Normal periods
(B) Short periods
C) Long periods
(D) Very long periods
42. _ halogen has the lowest electronegativity?
(A) Chlorine
(B) Fluorine
(C) Bromine
D) Iodine
43. Which cell consists of three sub-shells?
(A) L
B) M
(C) N
(D) O
44. The molar mass of H2SO4 is?
(A) 98 amu
B) 98 g
(C) 9.8 g
(D) 9.8 amu
45. _ element is found in most abundance in the earth’s crust.
A) Oxygen
B) Aluminium
C) Silicon
D) Iron
46. Atomic number of Copper is?
(A) 26
(B) 27
(C) 28
D) 29
47. What is the atomic mass of sulfur?
(A) 31
B) 32.06
(C) 33.36
(D) 40.595
48. Atomic number of Neon is?
(A) 8
(B) 9
C) 10
(D) 11
49. The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disappears. The behavior is a characteristic of a substance forming:
A. Allotropic Crystal
B. Liquid Crystal
C. Isomeric Crystal
D. Isomorphous crystals
50. Which of the following is an example of a body-centered cube?
A. Magnesium
B. Zinc
C. Copper
D. Sodium
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