ECAT Chemistry Chapter 4 Liquids & Solids With Answers

ECAT Chemistry Chapter 4 Liquids & Solids

Sr. # Questions Answers Choice
1 The boiling point of NH3 is maximum among the hydrides of group V elementsdue to: Enhanced electronegative character of Nitrogen Pyramidal structure of NH3 Very small size of Nitrogen. Enhanced electropositive character of Nitrogen
2 Which of the following liquids has low vapour pressure at 25°C:

 Diethyl ether Acetone. Water. Ethyl alcohol.
3 Which of the following liquids has low vapor pressure at 25°C:

 Diethyl ether Acetone. Water. Ethyl alcohol.
4 Escape of high energy molecules from the surface of liquid is called: Sublimation. Distillation. Condensation. Evaporation.
5 A liquid on evaporation causes: Heating effect. Cooling effect. Suffocation . All of above
6 At sea level and at 100°C the vapor pressure of water in an open system is:

 1000 mm Hg 760 mm Hg 730 mm Hg 670 mm Hg
7 Rate of evaporation and rate of condensation at equilibrium: Become very low Become very high Become equal Can never be equal.
8 Evaporation of water is possible at: Above 100<span style="font-size: 11pt; line-height: 107%; font-family: Arial, sans-serif; color: rgb(34, 34, 34); background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°C</span> 0<span style="font-size: 11pt; line-height: 107%; font-family: Arial, sans-serif; color: rgb(34, 34, 34); background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°C</span> 100<span style="font-size: 11pt; line-height: 107%; font-family: Arial, sans-serif; color: rgb(34, 34, 34); background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°C</span> At all temperature
9 H2S is a gas while H2O is a liquid at room temperature. It is due to: Less inter-molecular forces in water. Covalent bonding H-O in water molecule. Hydrogen bonding in water molecules Ionic character in water molecules
10 Hydrogen bonding is present in one of the following pairs: NH<sub>3</sub> H<sub>2</sub>O HF All of above
11 Debye forces are present in on of the following pairs: Na+ion and water Argon and water Argon and Na+ion Ne and water
12 The strongest forces are: Debye froces London dispersion Dipole-dipole attraction Hydrogen bonding
13 Polypeptide chains are coiled about one another into a spiral by: Ionic bonds Covalent bonds Van der Waal's forces Hydrogen bonds
14 HF has exceptionally low acidic strength due to: Smaller size of fluorine. Stronger polar bond between H and F. Electronegativity of fluorine Strong hydrogen bonding
15 Hydrocarbon molecule with large chain lengths experience: Weaker attractive forces Stronger attractive forces Repulsive forces No attractive forces
16 In a group on going downward, polarizability generally: Decreases Increases Remain constant Negligible
17 London dispersion forces are also called: Hydrogen bonding. Debye forces Van der Waal's forces Instantaneous dipole-induced dipole forces.
18 London dispersion forces are alos called: Hydrogen bonding. Debye forces Van der Waal's forces Instantaneous dipole-induced dipole forces.
19 The inter-molecular forces in liquids are: Negligible Very weak Very strong Reasonably strong
20 The gases can be converted into liquids by: Increasing the pressure only. Lowering temperature and increasing pressure Increasing pressure and bringing temperature below critical points Lowering temperature only
21 Which one of the following is weakest inter molecular force? Dipole induced dipole forces Ionic dipole forces Electrostatic forces b/w ions Dipole dipole forces
22 The density of water decreases, When it is freezed at 0°C Change of bond length Change of bond angles Cubic structure of ice Empty spaces present in the structure of ice
23 ]Which of the following is a pseudo solid?

Atoms of He is gaseous stat at high temperate. Molecules of water in liquid state. Molecules of solid l<sub>2</sub> Molecular of hydrochloric acid gas
24 Force of attraction b/w atoms of He is : London dispersion forces Hydrogen bonding Coordinate covalent bond Covalent bond
25 Chloroform and acetone are soluble in each other due to: Instantaneous dipole interactions. Dipole-dipole interactions. Inter molecular hydrogen bonding. All of above
26 Diamond is a bad conductor because: It<i></i>has tight structure It has a high density There is no free electron present in the crystal of diamond of conduct electricity is transparent to light
27

Which of the following is a pseudo solid?

<p class="MsoNormal">CaF<sub>2</sub> <o:p></o:p></p> <p class="MsoNormal">Glass<o:p></o:p></p> <p class="MsoNormal">NaCL<o:p></o:p></p> <p class="MsoNormal">All<o:p></o:p></p>
28 The molecules of CO2 in dry ice from the : Ionic crystals Coverlet crystals Molecular crystals Any type of crystals
29 Amorphous solids: Have a sharp melting point Undergo clean cleavage when cut with knife Have a perfect arrangement of atoms Can possesses small regions of orderly arrangement of atoms
30 Ionic solids are characterized by : Low meeting points Good conductivity in solid state High vapor pressure Solubility in polar solvents
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