MDCAT Chemistry Chapter 4 Liquids Online Test With Answers

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MDCAT Chemistry Chapter 4 Liquids Online Test

Sr. # Questions Answers Choice
1 Amount of heat absorbed when one mole of a solid melts into liquid form at its melting point is called: heat of vaporization latent heat of fusion molar heat of fusion molar heat of sublimation
2 The boiling point of glycerin at 1 atmospheric pressure is: 290°C 390°C 190C° 210°C
3 In order to maintain the boiling point of water at 110 C°, the extemal pressure should be 550 torr between 500 and 760 tor between 760 and 1500 torr any pressure can be maintained
4 Which of following factor affect vapour pressure of a liquid? temperature inter molecules forces size of the molecules all of these
5 The boiling of water may be 120°C, when the external pressure is greater than 760 torr less than 760 torr equal to 760 torr variable
6 Liquids evaporate at every temperature. When the temperature becomes constant for a liquid, then: rate of evaporation is greater than the rate of condensation the rate of condensation is greater than the rate of evaporation The rate of condensation and evaporation become equal it depends upon the nature of the liquid
7 Point out the substance which has maximum vapour pressure at a given temperature? Acetone Water Ethanol Acetic acid
8 Vapour pressure of a substance does not depend upon: physical state of matter temperature intermolecular forces surface area
9 Which of the following liquid has highest bolling point HCI HBr H2O Br2
10 The B.P. of compound is mostly raised by dipole-induced dipole interactions london dispersion forces intramolecular H-bonding intermolecular H-bonding
11 The vapour pressure of a liquid depends upon amount of the liquid surface area temperature size of container
12 The B.P of glycerine at 760 torr pressure is 200°C 290C° 250C° 262C°
13 lce occupies more space than liquid water 9% 10% 11% 12%
14 At freezing point of water, the density decreases due to change of bond angles change of bond lengths cubic structure of ice empty spaces present in the structure of ice
15 The long chains of amino acids are coiled around one another into a spiral by ionic bond Van der Waal's forces hydrogen bonding overlapping of orbitals
16 H2O and HF are the hydrides of the second period. Fluorine is more electronegative than oxygen. Anyhow, the boiling point of water is greater than that of HF. This is due to: water is more polar than HF water has a bent structure HF has a zig zag structure after making hydrogen bonding the number of hydrogen bonds produced by water are greater than that of HF
17 Hydrogen bonding is extensively present in proteins which form the spiral. The hydrogen bond being produced is between nitrogen and hydrogen atom oxygen and hydrogen atom carbon and hydrogen atom oxygen and carbon atom
18 Halogens form halogen acids. HF is the weakest among all of them This is due to the reason that fluorine is a very small-sized atom fluorine is highly electronegative atom there is strong hydrogen bonding in HF the polarity of HF bond is less
19 The boiling point of H2O is 100°C while that of C2H5-OH is 78.5C°. The reason is that: H2O molecules are small-sized the bond angles at oxygen atom are different C2H5-group is electron donating the number of H-bonds are greater in H20, than C2H5-OH
20 Oxygen and sulphur are present in VI-A group of the periodic table The hydride of oxygen i.e., H2O is liquid at room temperature but the hydride of sulphur (H2S) is a gas. This is due to greater bond angle of water than Hs greater bond lengths in HS than H2O hydrogen bonding in water acidic character of HS
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