51. When methl iodide and ethyl iodide are treated with sodium metal possible major products are obtained ?
A. 1
B. 2
C. 3
D. 4
52. Which statement is consistent with Hunds rule ?
A. Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) spin.
B. The electrons in the same atom cannot have the same four quantum numbers
C. There is maximum of two electrons is an orbital.
D. None
53. In water, ratio of oxygen and hydrogen by mass is
(A) 2:1
(B) 1:2
(C) 8:1
(D) 1:8
54. Which of the following is mineral fiber ?
A. Teflon
B. asbestos
C. saran
D. acrylic
55. The hardest of the following solids is__________________?
A. sodium
B. diamond
C. graphite
D. magnesium
56. Which of the solid does not contain covalent bond__________________?
A. copper
B. ice
C. diamond
D. graphite
57. The balanced chemical equation for the reaction which occurs when Be is added to water is____________?
A. Be+2H2O?Be (OH)2+H2
B. Be+H2O?Be (OH)2+H2
C. Be+H2O?[Be (OH)4]+2+H2
D. no reaction
58. Which of the following theories is superior to others__________________?
A. VSEPR
B. VBT
C. MOT
D. none of the above
59. Which of the following is not characteristics of reversible reaction__________________?
A. whole amount of reactant does not change into product
B. chemical equilibrium is established
C. a catalyst changes the direction of reaction
D. rate of forward reaction decreases as reaction proceeds
60. A solution has pH = 0 its H+ ion concentration is__________________?
A. 1 x 10-1
B. 1 x 10-14
C. 1 x 10-7
D. 1