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
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