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Quiz 5
Mdcat-past-papers - NUMS Quiz
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Board: NUMS |
81. Select the greatest number of particles in the following:
2g of Na
2g of H₂
2g of N₂
2g of CO₂
82. Half atmospheric pressure is:
400torr
101.3 Pa
50622Pa
8.5 pounds
83. Pressure remaining constant, at which temperature volume of gas will become twice to be volume at 0°C?
546°C
200°C
546°C
273°C
84. 1 calorie is equal to:
4.18J
4.18KJ
18KJ
1.8J
85. A gas has a volume of 10dm³ at 10°C. At what temperature the volume of the gas is reduced to half?
283k
566k
142k
373k
86. The values of STP for mole of any ideal gas is:
273.16K & 1atm
0°C & 1mmHg
273.16° & 1atm
0K & 1atm
87. A graph between volume and temperature gives a straight line which cuts the temperature axis at:
0°C
273°C
546°C
-273°C
88. Which variable mentioned in ideal gas is assumed to be constant in other gas laws?
Volume
Temperature
Pressure
Number of moles
89. Which of the following represents equation for ideal gas?
PV = nRT
PT = nRv
P = nRT
T = npv/R
90. The SI unit for pressure is:
mm of Hg
bar
Pascal
Torr
91. If both temperature and volume of gas are doubled, the pressure:
Cannot be predicted
Is reduced to ½
Remains unchanged
Is doubled
92. The idea that molecules in gases are in constant movement is called:
Kinetic theory of gases
Molecular orbital theory
Crystal field theory
Transition state theory
93. The relationship between the absolute temperature and the velocities of gas molecules is given by:
C_rms = √(3RT/M)
V= √(2Ek/m)
PV = nRT
PV = 1/3 m Nc²
94. Which of the following is the most ideal gas?
H₂
N₂
O₂
He
95. Carboxylic acids are water soluble because they:
are more reactive
have hydrogen bonding
have low melting point
have high density
96. When two ice cube are pressed over each other they unite to form one cube due to
Dipole- dipole interaction
Covalent attration
Vander Wall Forces
Hydrogen Bonding
97. Water shows maximum density at:
0°C
4°C
5°C
100°C
98. When two ice cubes are pressed over each other they unite to form one cube due to:
Dipole dipole interaction
Covalent attraction
Van Der Waal's forces
H-bonding
99. Upon which factor vapor pressure is independent?
Temperature
Intermolecular forces
Density of liquid
Surface area of liquid
100. Molar heat of vaporization is the amount of heat required to convert one mole of:
Liquid into its vapour at its boiling point
Liquid into its vapour
Solid into vapors
Solid into liquid at its melting point
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