Chapter 7

Colloid particles show ____ movement.

Name some salts which impart hardness to water.

The molarity of a \(250 \mathrm{ml}\) solution is \(0.5 \mathrm{M}\). The amount of solute present in it is ____ \(\mathrm{g}\). (molecular weight of the solute \(=58\) )

How does the process of boiling soften water?

What is a binary solution? Give one example.

Mention the specific property of water due to which it acts as an universal solvent.

The smallest unit of crystalline solid is called ____.

Define solubility.

Give examples of the following solutions: (i) Solid in solid (ii) Gas in liquid (iii) Liquid in solid

Why do we get a fizzing sound when a cool drink bottle is opened?

Effervescence is observed when the water is warmed. What is the reason behind it?

Solubility of salt 'A' in water at \(25^{\circ} \mathrm{C}\) is 15 . What is the meaning this statement?

Name one hygroscopic substance whose physical state does not change by absorbing water.

What is meant by unit cell of a crystalline solid?

Why does the colour of the solid blue copper sulphate become white on heating?

What is the relation between coulomb and faraday?

What are dispersed phase and dispersion medium?

In what ratio by mass, hydrogen and oxygen are produced by the electrolysis of water?

What is the total charge of 2 moles of electrons in faraday?

What are the equivalent weights of cuprous ion and cupric ion?

The number of water molecules present in glauber salt is ____.

Find out the mass of the solvent present in \(500 \mathrm{~g}\) of \(30 \%\) sodium chloride solution.

Differentiate (i) soft and hard water and (ii) temporary and permanent hardness of water.

Identify the physical state of the dispersed phase and dispersion medium of the following colloids: (i) Smoke (ii) Blood (iii) Cheese (iv) Fog (v) Coloured glass

What is the mass of the solute present in 1 litre of \(0.2 \mathrm{M}\) sodium carbonate solution?

How many grams of potassium chloride is present in \(250 \mathrm{~g}\) of saturated solution if the solubility of \(\mathrm{KCl}\) is \(35.8\) at \(25^{\circ} \mathrm{C} ?\)

What is the effect of temperature and pressure on the solubility of solids and gases in liquids?

Establish the relationship between equivalent weight and electrochemical equivalent.

If small pieces of sodium and potassium are dropped separately in two beakers containing water, golden and lilac flames are observed on the surface of water in the respective beakers. Justify these observations.

What are the different processes of crystallization?

Explain molarity and weight percentage.

Differentiate deliquescence and efflorescence.

What is ratio by mass of magnesium and calcium obtained when the electrolysis of their respective chlorides are carried out in the molten state, if the number of moles of both the chlorides taken are same?

Compare and contrast solution, colloid and suspension.

State the two laws of electrolysis. Explain with examples.

Explain saturated, unsaturated and super saturated solutions and their interconversion without adding any solute in the solution.

Explain the different processes of removal of temporary and permanent hardness of water

What are the different properties of colloids? Explain.