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Quiz 23
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441. 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
442. Correct order of boiling points of the given liquid is:
H₂O>HF>HCL> NH₃
H₂O>HF>NH₃>HCL
HF>H₂O>NH₃>HCL
HF>NH₃>NH₂>HCL
443. Which of the following factor does not affect the magnitude of vapor pressure?
amount of liquid
temperature of liquid
Size of molecule
intermolecular forces
444. Which is not a property of liquid?
Osmotic pressure
Diffusion
Freezing point
Melting
445. In order to boil water at 110°C, external pressure should be:
200-760 torr
665-670 torr
760 1200 torr
660-700 torr
446. Boiling point of a liquid is a temperature at which;
Surface tension is greater than the atmospheric pressure
Viscosity is less than the atmospheric pressure
Vapour pressure equal the atmospheric pressure
viscosity equals the atmospheric pressure
447. Which of the following influences the variation of temperature at which boiling liquid takes place?
Amount of Gas
Outside pressure
Volume of container
amount of liquid
448. The boiling point of water in Kelvin scale is:
0 K
32 K
273 K
373 K
449. Which of the following has highest surface tension?
Benzene
Alcohols
Ether
Water
450. Which of the following has highest boiling point?
C₆H₁₄
C₅H₁₂
C₁₀H₂₂
C₃H₈
451. Which of the following has lowest vapour pressure at 20°C?
Diethyl ether
Chloroform
CCl₄
Water
452. The compound which exhibits highest vapour pressure is:
Water
HF
Petrol
Acetic acid
453. Which of the following compound has less boiling point?
Water
Ethanol
Hydrogen Sulphide
Acetic acid
454. A pressure cooker reduces cooking time because:
A large heat is used
Heat is more evenly distributed
The higher pressure softens food inside
the boiling point of water rises inside
455. Which of the following compound has highest boiling point?
Water
Cyclopentane
Cycloheptane
Cyclobutane
456. Amount of heat absorbed, when one mole of liquid changes to gas at its boiling point is called:
Molar heat of sublimation
Latent heat of fusion
Heat of vaporization
Heat capacity
457. Molar heat of vaporization of water is:
40.7 cal / mol
40.7 kcal / mol
40.7 J / mol
40.7 kJ / mol
458. Distillation under very reduced pressure is is --distillation.
Destructive
Fractional
Steam
Vacuum
459. CO₂ and SO₂ both are triatomic molecules but heat of vaporization of SO₂ is greater than that of CO₂ due to:
High electronegativity of S
Greater size of SO₂
SO₂ is polar and CO₂ is non-polar
SO₂ is more acidic than CO₂
460. Which of the following has the lowest vapor pressure at 20°?
Diethyl ether
Chloroform
Carbon tetrachloride
Water
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