HARD

Earn 100

Differentiate between: Distillation and Fractional distillation.

Important Questions on Is Matter around Us Pure?

EASY

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

Given below are two statements:
Statement-I: Retardation factor $(R_{f})$ can be measured in meter/centimetre.

Statement-II: $R_{f}$ value of a compound remains constant in all solvents.

Choose the most appropriate answer from the options given below:

EASY

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

9 gram anhydrous oxalic acid (mol. Wt. = 90) was dissolved in 9.9 moles of water. If vapour pressure of pure water is

P_{1}^{o}

the vapour pressure of solution is

MEDIUM

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

Using the provided information in the following paper chromatogram:

Question Image

The calculated $R_{f}$ value of $A is_____\times 10^{- 1}$ .

MEDIUM

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

Liquid

M

and liquid

N

form an ideal solution. The vapour pressures of pure liquids

M

and

N

are

450

and

700 m m H g,

respectively, at the same temperature. Then correct statements is:
(

x_{M} = M o l e f r a c t i o n o f {' M}^{'} i n s o l u t i o n;

x_{N} = M o l e f r a c t i o n o f {' N}^{'} i n s o l u t i o n;

y_{M} = M o l e f r a c t i o n o f {' M}^{'} i n v a p o u r p h a s e;

y_{N} = M o l e f r a c t i o n o f {' N}^{'} i n v a p o u r p h a s e;

)

EASY

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

On heating camphor in a porcelain dish it got mixed in air without melting. This phenomenon is known as

MEDIUM

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

Components present in air can be separated by

MEDIUM

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

How many grams of glucose are required to prepare an aqueous solution of glucose having a vapor pressure of

23.324 mm Hg

25 ° C

100 g

of water? The vapour pressure of pure water at

25 ° C

23.8 mm Hg .

MEDIUM

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

For a solution formed by mixing liquids

L

and

M

, the vapour pressure of

L

plotted against the mole fraction of

M

in solution is shown in the following figure, Here,

X_{L}

and

X_{M}

represent mole fractions of

L

and

M

, respectively, in the solution. The correct statement(s) applicable to this system is(are) -

Question Image

EASY

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

Which of the following contain five molecules of water of crystallisation?

MEDIUM

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

Which method is used to separate cream from milk:

HARD

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

At a refinery, petroleum is separated into several components by a process called fractional distillation using a fractionating column. Which of the following statement is incorrect about the process?
(I) Temperature decreases from the bottom to the top of the column
(II) At each level in the column only one compound is collected
(III) The fraction collecting at the top of the column is less volatile
(IV) The fraction with the highest boiling point condenses first and gets collected near the base of the fractionating column.

MEDIUM

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

For an effective separation of two components of a miscible liquid by fractional distillation, what is the minimum difference in boiling point of two components?

HARD

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

How will you separate a mixture containing kerosene and petrol (difference in their boiling points is more than

25 ° C

) which are miscible with each other?

MEDIUM

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

How will you separate a mixture containing kerosene and petrol (difference in their boiling points is more than 25^o C) which are miscible with each other?

EASY

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

What difference in the property of two miscible liquids enables their separation by fractional distillation?

EASY

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

Name two gases which are supplied in compressed form in homes and hospitals.

MEDIUM

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

How will you separate the various components of air?

EASY

Science>Chemistry>Is Matter around Us Pure?>Separation of Components of a Mixture

Why is the leakage of LPG detected easily although it is odourless? State the steps to be taken in case its leakage is detected in the kitchen.