A maxima or minima obtained in the temperature, composition curve of a mixture of two liquids indicates:

1.  an azeotropic mixture

2. a eutectic formation

3.  that the liquids are immiscible with one another

4.  that the liquids are partially miscible at hte maximum or minimum 

The boiling point of an azeotropic mixture of water and ethyl alcohol is less than that of the theoretical value of a water and alcohol mixture. Hence, the mixture shows: 

1. That solution is highly saturated

2. Positive deviation from Raoult's law

3. Negative deviation from Raoult's law

4. Nothing can be inferred

The substances whose solubility decreases with increase in temperature:

1.  $Ca{\left(OH\right)}_2$

2.  $N{a}_{2}C{O}_3$

3.  $N{a}_{2}S{O}_4$

4.  all of these 

Two solutions ($A$) containing ${\mathrm{FeCl}}_3\left(\mathrm{aq}\right)$ and ($B$) containing ${\mathrm{K}}_4\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$ are separated by semipermeable membrane as shown below. If ${\mathrm{FeCl}}_3$ on reaction with ${\mathrm{K}}_4\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$, ​produces blue colour of ${\mathrm{Fe}}_4\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$, the blue colour will be noticed in:

(1) (A)

(2) (B)

(3) in both (A) and (B)

(4) neither in (A) nor in (B)

Each pair forms ideal solution expect:

(1) ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Br} \mathrm{and} {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{I}$

(2) ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{Cl} \mathrm{and} {\mathrm{C}}_6{\mathrm{H}}_5\mathrm{Br}$

(3) ${\mathrm{C}}_6{\mathrm{H}}_6 \mathrm{and} {\mathrm{C}}_6{\mathrm{H}}_5·{\mathrm{CH}}_3$

(4) ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{I} \mathrm{and} {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$

Mole fraction of solute in an aqueous solution that boils at 100.104 is :

( $K_b$ for $H_{2}O$ = 0.52 K $molalit{y}^{-1}$)

1.  0.008

2.  0.004

3.  0.061

4.  0.996

At Abu mountains, water boils at 96$°C$. What amount of NaCl be added in 1 kg water so that it boils at 100$°C$. ${\mathrm{K}}_{\mathrm{b}} \mathrm{for} {\mathrm{H}}_2\mathrm{O} = 0.52 \mathrm{K} {\mathrm{molality}}^{-1}$.

1.  225 g

2.  450 g

3.  200 g

4.  125 g 

Freezing point of an aqueous solution is -0.166$°$C. Elevation of boiling point of same solution would be-

(K_b = 0.512 K m^-1 and K_f = 1.66 K m^-1)

A substance is completely trimerized on dissolution in a solvent. The van;t Hoff factor (i) for such change is:

1.  1

2.  2

3.  3

4.  1/3 

The freezing point of aqueous solution that contains 5% by mass urea, 1.0% by mass KCl and 10% by mass of gulcose is: (k${}_f$H${}_2$=1.86 K molality${}^{-1}$)

1. 290.2 K 

2. 285.5 K 

3. 269.93 K 

4. 250 K