KPK 11th Class Chemistry Chapter 5 States of Matter-II Liquids Short Questions Answers

KPK 11th Class Chemistry Chapter 5 States of Matter-II Liquids Short Questions with answers are combined for all 11th class(Intermediate/hssc) Level students.Here You can prepare all Chemistry Chapter 5 States of Matter-II Liquids short question in unique way and also attempt quiz related to this chapter. Just Click on Short Question and below Answer automatically shown. After each question you can give like/dislike to tell other students how its useful for each.

Class/Subject: 11th Class Chemistry

Chapter Name: States of Matter-II Liquids

Board: All KPK Boards

Malakand Board 11th Class Chemistry Chapter 5 States of Matter-II Liquids short questions Answer
Mardan Board 11th Class Chemistry Chapter 5 States of Matter-II Liquids short questions Answer
Peshawar Board 11th Class Chemistry Chapter 5 States of Matter-II Liquids short questions Answer
Swat Board 11th Class Chemistry Chapter 5 States of Matter-II Liquids short questions Answer
Dera Ismail Khan Board 11th Class Chemistry Chapter 5 States of Matter-II Liquids short questions Answer
Kohat Board 11th Class Chemistry Chapter 5 States of Matter-II Liquids short questions Answer
Abbottabad Board 11th Class Chemistry Chapter 5 States of Matter-II Liquids short questions Answer
Bannu Board 11th Class Chemistry Chapter 5 States of Matter-II Liquids short questions Answer

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KPK 11th Class Chemistry Chapter 5 States of Matter-II Liquids Short Questions Answers

Given at least two of the effects on our livers if water has weak hydrogen bonding among its molecules.

Effect No. 1 the molar heat of vaporization and fusion would become lower if water has weak hydrogen bonding. Its adverse effect on our life will be .
Effect No.1
The lower heat of vaporization of water will result in to fast and huge evaporation of water will causes rain and flood and also affect the water cycle.

HF is a liquid at ordinary temperature while HCL is a gas.

HF possesses strong Hydrogen bonding.
Therefore, it exists in liquid sate at room temperature. While in HCL there are dipole-dipole forces, weaker than HF (Hydrogen bonding). There fore, HCL exists in gaseous state at room temperature.

Hs+________ Fs– ……… Hs+________Fs–
↑
. H.Bond
Hs+______ Cls-………….. Hs+______ Cls–
↑
. Dipole- dipole forces

H2O has high boiling point than HF, although Fluorine is more electronegative than oxygen.

The high boiling point of water as compared to HF is due to the strong H- bonding in water. Fluorine is more electronegative than oxygen. So we expect H- bonding in HF to be stronger than that in water and as a result the boiling point of HF should be higher than that of water. However it is lower and the reason is that the fluorine atom can make only one hydrogen bond with electro positive hydrogen of a neighboring molecules but water can form two hydrogen bonds per molecule, as it has two hydrogen atoms and two lone pairs on oxygen atom. Each water molecule can potentially form four hydrogen bond with surrounding water molecules. (two hydrogen atoms and two lone pair of electrons). This is the reason that boiling point of water is higher than that of hydrogen fluoride. In hydrogen fluoride, the problem is a shortage of hydrogen.

Water and ethanol can mix easily in all proportions.

Water and ethanol are miscible in all proportions because of

Both are polar and like dissolves like
Ethanol and water form hydrogen bonding with each other

Hs — Hs+____ Os-……… Hs+______Os+—C2H5
↑
H.Bond

3. Smaller non-polar alkyl group (C2H5-) i.e. ethyl group because the miscibility of alcohol decreases sharply as the number of carbons increases.

Neon and Argon both are mono atomic noble gases of the same group. Neon has - 248°C boiling point while Argon has - 189°C. Why?

Neon and argon are non- polar gases and London dispersion forces are present. However the strength of London dispersion forces depends upon.

The size of the electron cloud of the atoms or molecules.
When the size of the atom or molecules is large then the dispersion becomes easy and these force becomes more prominent and strong that is why Argon has high boiling point than Neon.

Different liquids have different rates of evaporation even at the same temperature.

The rate of evaporation depends on the strength of inter molecules forces. Stronger the intermolecular forces, lower will be the rate of evaporation and vice versa. Therefore, different liquids have different rate of evaporation.

Earth were vessels keep water cool in hot summer day. Vacuum distillation can be used to avoid decomposition of a sensitive liquid.

a) Earth wares have small pores through which evaporation occurs. The molecules having high K.E escape into the gaseous state and the average K.E of the remaining liquid is decreased, thus the temperature is lowered and water remains cool.
b) vacuum distillation can be used to avoid decomposition of a sensitive liquid.
There are certain compounds, which decompose, when heated to their normal B.P. vacuum distillation is carried out to avoid this decomposition. E.g. glycerin boils at 290°C under normal pressure (760 mmHg) but at this temperature glycerin decomposes. Therefore, the pressure is decreased to 50 mm at which glycerin boils at 210°C. such phenomenon is called vacuum distillation.

A liquid boils at different temperatures at sea – level and at mountain.

Boiling point depends on external pressure, greater is the external pressure, higher will be the boiling point. If the external pressure is low then the boiling point of the liquid will also be low. That is why; water boils at about 89°C at mountain (Murree) (P – 0.921) atm less than (1 atm) because atmospheric pressure is lower over there and at sea level the atmospheric pressure is 1 atm. Therefore, the boiling point of water is 100°C.

Evaporation of a liquid causes cooling.

Evaporation causes cooling because the molecules having high K.E escape into the gaseous state and the average K.E of the remaining liquid is decreased, thus the temperature is lowered. As the evaporation process proceeds it absorbs more and more heat from the surrounding. There fore, the temperature of the surrounding also decreases.

Temperature of a liquid remains constant during boiling although heat is being supplied continuously.

The boiling point of liquid remains constant although heat is continuously supplied during boiling. This is due to the reason that the heat supplied, is used to overcome the inter molecules attractive forces and convert the liquid into gas.

Why water droplet is spherical?

Rain drops have spherical shape because a sphere has the least surface to volume ration which it acquires due to surface tension.

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KPK 11th Class Chemistry Chapter 5 States of Matter-II Liquids Short Questions Answers

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