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ECAT Chemistry Chapter 4 Liquids & Solids Online Test
| 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 |
