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10 months ago

Chemistry Solutions

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

(i) 0.004

(ii) 0.008

(iii) 0.012

(iv) 0.016
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Payal Gupta

Contributor-Level 10

This is a multiple choice answer as classified in NCERT Exemplar

(iv) 0.016

Explanation: Apply the relation : M1V1= M2V2

Given: M1=0.02M, V1=4L, M2=? V2=5L

Therefore, 0.02*4L=M2*5L

M2=0.08/5

=0.016 M

New answer posted

10 months ago

Chemistry Solutions

If two liquids A and B form minimum boiling azeotrope at some specific composition then_______________.

(i) A–B interactions are stronger than those between A–A  or B–B.

(ii) Vapour pressure of solution increases because more number of molecules of liquids A and B can escape from the solution.

(iii) Vapour pressure of solution decreases because less number of molecules of only one of the liquids escapes from the solution.

(iv) A–B interactions are weaker than those between A–A or B–B.
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Payal Gupta

Contributor-Level 10

This is a multiple choice answer as classified in NCERT Exemplar

(iv) A–B interactions are weaker than those between A–A or B–B.

Explanation: (i) At a given composition, the solutions that demonstrate a big positive divergence from Rault's law form a minimum boiling azeotrope.

(ii) When Rault's law is deviated positively, A-B interactions are weaker than A-A or B-B interactions.

New answer posted

10 months ago

Chemistry Solutions

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” 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 Fig.2.2. At a given temperature, which of the following statement is correct about the vapour pressure of pure water and that of NaCl solution.

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

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

(iii) Vapour pressure i

...more
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Payal Gupta

Contributor-Level 10

This is a multiple choice answer as classified in NCERT Exemplar

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

Explanation:  Due to the fleeing inclinations of water molecules from the liquid's surface, the vapour pressure rises. The vapour pressure increases as the number of molecules on the liquid's surface increases. Because only water molecules are present at the surface of beaker A, it has a higher vapour pressure. However, a fraction of the surface area of the solution in beaker B containing NaCl solution is occupied by NaCl molecules, which are non-volatile and have no tendency to escape. As a resul

...more

New answer posted

10 months ago

Chemistry Solutions

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

(A) In bromoethane and chloroethane mixture intermolecular interactions of A–A and B–B type are nearly same as A–B type interactions.

(B) In ethanol and acetone mixture A–A or B–B type intermolecular interactions are stronger than A–B type interactions.

(C) In chloroform and acetone mixture A–A or B–B type intermolecular interactions are weaker than A–B type  interactions.

(i) Solution (B) and (C) will follow Raoult's law.

(ii) Solution (A) will follow Raoult's law.

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

...more
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Payal Gupta

Contributor-Level 10

This is a multiple choice answer as classified in NCERT Exemplar

(ii) Solution (A) will follow Raoult's law.

Explanation:  A-A and B-B intermolecular interactions should be almost identical to A-B type interactions in an ideal solution.

New question posted

10 months ago

Chemistry Solutions

We have three aqueous solutions of NaCl labelled as ‘A’,‘B’ and ‘C’ with

Concentrations 0.1 M, 0.01 M and 0.001 M, respectively. The value of van’t Hoff factor for these solutions will be in the order______.

(i) iA

(ii) iA >iB>iC

(iii) iA=iB=iC

(iv) iAiC
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New question posted

10 months ago

Chemistry Solutions

We have three aqueous solutions of NaCl labelled as ‘A’,‘B’ and ‘C’ with

Concentrations 0.1 M, 0.01 M and 0.001 M, respectively. The value of van’t Hoff factor for these solutions will be in the order______.

(i) iA

(ii) iA >iB>iC

(iii) iA=iB=iC

(iv) iAiC
0 Follower 6 Views

New answer posted

10 months ago

Chemistry Solutions

Consider the Fig. 2.1 and mark the correct option.

(i) Water will move  from side (A) to side(B) if a pressure lower than osmotic pressure is applied on piston (B).

(ii) Water will move from side (B) to side (A) if a pressure greater than osmotic pressure is applied on piston (B).

(iii) Water will move from side (B) to side (A) if a pressure equal to osmotic pressure is applied on piston (B).

(iv) Water will move from side (A) to side (B) if pressure equal to osmotic pressure is applied on piston (A).
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Payal Gupta

Contributor-Level 10

This is a multiple choice answer as classified in NCERT Exemplar

(ii) Water will  move from side (B) to side (A) if a pressure greater than osmotic pressure is applied on piston (B).

Explanation:  Due to reverse osmosis, water will travel from side (B) to side (A) if a pressure greater than osmotic pressure is applied to the piston (B).

New answer posted

10 months ago

Chemistry Solutions

The value of Henry's constant KH is_____________.

(i) Greater for gases with higher solubility.

(ii) Greater for gases with lower solubility.

(iii) Constant for all gases.

(iv) Not related to the solubility of gases.
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Payal Gupta

Contributor-Level 10

This is a multiple choice answer as classified in NCERT Exemplar

(ii) Greater for gases with lower solubility.

Explanation : Because of the mathematical relationship, the value of Henry's constant KH is bigger for gases with lesser solubility-

p= kH x

kH=p/x

Where, KH represents Henry's constant, p is partial pressure of the gas in vapour phase, and x denotes mole fraction of  the gas in solution. Thus KH is inversely proportional to mole fraction of gas in solution (representing  its solubility)

New answer posted

10 months ago

Chemistry Solutions

Value of Henry's constant KH ____________.

(i) Increases with increase in temperature.

(ii) Decreases with increase in temperature.

(iii) Remains constant.

(iv) First increases then decreases.
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Payal Gupta

Contributor-Level 10

This is a multiple choice answer as classified in NCERT Exemplar

(i) Increases with increase in temperature.

New answer posted

10 months ago

Chemistry Solutions

Which of the following statements is false?

(i) Units of atmospheric pressure and osmotic pressure are the same.

(ii) In reverse osmosis, solvent molecules move through a semipermeable membrane from a region of lower concentration of solute to a region of higher concentration.

(iii) The value of molal depression constant depends on nature of solvent.

(iv) Relative lowering of vapour pressure, is a dimensionless quantity.
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Payal Gupta

Contributor-Level 10

This is a multiple choice answer as classified in NCERT Exemplar

(ii) In reverse osmosis, solvent molecules move through a semipermeable membrane from a region of lower concentration of solute to a region of higher concentration.

Explanation:

Solvent molecules pass through a semipermeable membrane in reverse osmosis from an area of higher solute concentration to a region of lower concentration, hence the supplied assertion at (ii) is untrue. 

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