1. Fill in the blanks with appropriate words chosen from those given in the brackets alongside. Answer any ten parts.

The technique used in laboratory for the concentration of suspension and breaking of emulsion is known as (centrifugation, distillation)

The current carrying capacity of a solution is known as (conductivity, current)

is used to bore a smooth hole of desired size in the cork. (Cork borer, Crucible tongs)

You should join soda glass to (soda glass, borosilicate glass)

The concentration of is accurately and precisely known. (standard solution, lime water)

1 mol is (6.022 x 10^23 atoms or molecules, 6.072 x 10^22 atoms or molecules).

Water is a solvent. (polar, non-polar)

In chromatogram, the position of the leading edge of the solvent is known as (solvent front, base line)

The temperature at which the vapour pressure above the liquid equals the external pressure, is known as (melting point, boiling point)

There are two basic methods of mechanical agitation shaking and (stirring, precipitation)

The moving component in the chromatographic technique is called (mobile phase, stationary phase)

Distilled water is essentially (condensed steam, concentrated steram)

Redox titrations involve reactions. (Precipitation, Oxidation-Reduction)

The solutions are intermediate between true solutions and suspensions. (colloidal, dilute)

2. Attempt any five of the following questions:

List any two advantages of using ground glass joints.

Why is it advisable to anneal glass after heating and working?

Write any four principal cleaning agents for glassware.

List any four informations required on the label of a liquid solution.

What causes permanent hardness in water?

What is the apparatus required for filtration

Define the distribution coefficient.

3. Answer any five of the following questions:

Write any two uses of mercury sealed stirrer.

What are the different types of flames Name them.

Calculate the amount of KMn04 (M=158 g required for preparing 500 mL of 0.1 M solution.

Write the use of a separating funnel.

Name any two types of analytical balances.

Name any two chemicals which may be used to remove the stain caused by potassium permanganate.

Give one example each of

an approximate and

an accurate measuring device for volumes.


Draw a labelled diagram of the apparatus used for column chromatography.

OR

Draw a labelled diagram of a simple distillation apparatus.

Give any three characteristics of an ideal washing liquid for precipitate.

OR

List any three precautions that you should take while heating glass.

5. Answer any five of the following questions:

What is a batwing burner?

How is the solubility of

solids and

gases in water affected with increase in temperature?

What are the advantages of refluxing

What is the pH of an acid having hydrogen ion concentration of mol

Name any two reagents which are stored in coloured bottles.

Write any two properties of a suitable solvent used for recrystallisation.

Explain the use of a heating mantle.