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76. Which of the following molecules is non-polar? (NTSE Odisha, Stage-I, 2015-16)
H2O
HF
NH3
CCI4
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77. Which of the following is a natural polymer? (NTSE Odisha, Stage-I, 2015-16)
Cellulose
Teflon
Nylon
Terylene
78. Find the number of coulombs required for conversion of one mole of MnO4- to one mole of Mn2+ (NTSE Odisha, Stage-I, 2015-16)
96,500
3 x 96,500
5 x 96,500
7 x 96,500
79. 0.25 mole of a hydrocarbon requires 0.5 mole of hydrogen for complete saturation. Possible formula of the hydrocarbon is (NTSE West Bengal, Stage-I, 2015-16)
C3H8
C3H6
C4H8
C3H4
80. x mole of oxygen gas is kept in a container of definite volume at a pressure of P atmosphere at TK. At the same temperature another y mole of oxygen gas introduced in that container. The total pressure will be (NTSE West Bengal, Stage-I, 2015-16)
x(1 + y)P
xp/x+y
yp/x+y
(x+y/x)p
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