Solutions's Question 21 | Chemistry XII - Part 1 | NCERT Exemplar Questions

MCQ (Single Correct Answer)

On the basis of information given below mark the correct option. Information

(i) In bromoethane and chloroethane mixture intermolecular interactions of $\mathrm{A}-\mathrm{A}$ and $\mathrm{B}-\mathrm{B}$ type are nearly same as $\mathrm{A}-\mathrm{B}$ type interactions.

(ii) In ethanol and acetone mixture $\mathrm{A}-\mathrm{A}$ or $\mathrm{B}-\mathrm{B}$ type intermolecular interactions are stronger than $A-B$ type interactions.

(iii) In chloroform and acetone mixture $\mathrm{A}-\mathrm{A}$ or $\mathrm{B}-\mathrm{B}$ type intermolecular interactions are weaker than $A-B$ type interactions.

Solution (ii) and (iii) will follow Raoult's law

Solution (i) will follow Raoult's law

Solution (ii) will show negative deviation from Raoult's law

Solution (iii) will show positive deviation from Raoult's law

MCQ (Single Correct Answer)

Two beakers of capacity 500 mL were taken. One of these beakers, labelled as " $A$ ", was filled with 400 mL water whereas the beaker labelled " $B^{\prime}$ was filled with 400 mL of 2 M solution of NaCl . At the same temperature both the beakers were placed in closed containers of same material and same capacity as shown in figure.

At a given temperature, which of the following statement is correct about the vapour pressure of pure water and that of NaCl solution?

Vapour pressure in container $(A)$ is more than that in container $(B)$

Vapour pressure in container $(A)$ is less than that in container $(B)$

Vapour pressure is equal in both the containers

Vapour pressure in container $(B)$ is twice the vapour pressure in container ( $A$ )

MCQ (Single Correct Answer)

If two liquids $A$ and $B$ form minimum boiling azeotrope at some specific composition then

$A-B$ interactions are stronger than those between $A-A$ or $B-B$

vapour pressure of solution increases because more number of molecules of liquids $A$ and $B$ can escape from the solution

vapour pressure of solution decreases because less number of molecules of only one of the liquids escape from the solution

$A-B$ interactions are weaker than those between $A-A$ or $B-B$

MCQ (Single Correct Answer)

4 L of 0.02 M aqueous solution of NaCl was diluted by adding 1 L of water. The molality of the resultant solution is ........... .

0.004

0.008

0.012

0.016

MCQ (Single Correct Answer)

On the basis of information given below mark the correct option. Information On adding acetone to methanol some of the hydrogen bonds between methanol molecules break.

At specific composition methanol-acetone mixture will form minimum boiling azeotrope and will show positive deviation from Raoult's law

At specific composition methanol-acetone mixture will form maximum boiling azeotrope and will show positive deviation from Raoult's law

At specific composition methanol-acetone mixture will form minimum boiling azeotrope and will show negative deviation from Raoult's law

At specific composition methanol-acetone mixture will form maximum boiling azeotrope and will show negative deviation from Raoult's law

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