Solubility

Q.

$H_{2}S$ is a toxic gas with rotten egg like smell , is used for the qualitative analysis . If the solubility of $H_{2}S$ in water at STP is 0.195M , calculate Henry's law constant .

Q.

Explain Solvation enthalpy of ionic compounds and give the difference between solubility and solvation enthalpy?

Q. What will be the molality of a solution having 18g of glucose (mol. wt = 180) dissolved in 500g of water

1. 1 m
2. 0.5 m
3. 0.2 m
4. 2 m

Q. a solution comprising 0.1 mole of naphthalene and 0.6 mole of benzene is cooled under some solid benzene phrases out the solution is d then decanted off from solid and warmed to 353 Kelvin, where its vapour pressure is found to be 608 torr. the amount of benzene that freezes out due to following is X gram the value of 5 x is

Q.

Which compound is most soluble in water?

1. Ethanal

2. Chloroethane

3. Ethanol

4. Ethylene glycol

Q.

Does benzene dissolve in water?

Q. The solubility product of $Ca(OH{)}_{2}at{25}^{\circ }Cis4.42\times {10}^{-5}$. A 500 ml of saturated solution of $Ca(OH{)}_2$ is mixed with equal volume of 0.4M NaOH solution. How much $Ca(OH{)}_2$ in milligrams is precipitated

1. 74 mg
2. 73 mg
3. 77 mg
4. 47 mg

Q. At what temperature $10\%\left(w/V\right)$ aqueous solution of glucose (mol mass is 180 g/mol) will exhibit an osomotic pressure of $16.42atm$?

1. ${360}^{\circ }C$
2. ${180}^{\circ }C$
3. $360K$
4. $180K$

Q. Maximum amount of a solid solute that can be dissolved in a specified amount of a given liquid solvent does not depend upon ____________.

1. Nature of solvent
   
2. Pressure
   
3. Nature of solute
   
4. Temperature

Q. Calculate the solubility product of $PbC{l}_2$ at a certain temperature if the solubility of $PbC{l}_2$ is $4.4g/L$ at the same temperature. (Given: molar masses in $g$, $Pb$ = 207, $Cl$ = 35.5)

1. $1.63\times {10}^{-7}mo{l}^3/L^3$
2. $1.63\times {10}^{-5}mo{l}^3/L^3$
3. $1.36\times {10}^{-5}mo{l}^3/L^3$
4. $1.36\times {10}^{-7}mo{l}^3/L^3$

Q.

Does the solubility of a substance change with temperature? Explain with the help of an example.

Q. 12. Out of Cr+2 and Cr+3, which one is stable in aqueous solution?

Q. What is laxative effect of sulphate

Q. How much AgBr could dissolve in $1.0Lof0.4MN{H}_3$ ? Assume that ${\left[Ag\right(N{H}_3{)}_2]}^{+}$ is the only complex formed given , $K_f{\left[Ag\right(N{H}_3{)}_2]}^{+}=1.0\times {10}^8,K_{sp}\left(AgBr\right)=5.0\times {10}^{-13}$

1. 
2. 
3. 
4. 

Q. If $1\text{g}$ of solute dimerise upto $75\%$ in $100\text{g}$ of $H_{2}O$ and show depression in freezing point by ${0.093}^{\circ }C$. Find average molecular weight of solute (in $\text{g}$) after dimerisation.
(Given: The freezing point depression constant of water is $K_{f\left(H_{2}O\right)}=1.86{}^{\circ }C/m$)

Q. Choose the correct statement regarding solubility.

1. It is defined as the minimum amount of solute which can be dissolved in a fixed amount of the solvent at a given temperature.
2. It is defined as the maximum amount of solute which can be dissolved in a fixed amount of the solvent at a given temperature.
3. It is defined as the minimum amount of solute which can be dissolved in a fixed amount of the solution at a given temperature.
4. It is defined as the maximum amount of solute which can be dissolved in a fixed amount of the solution at high temperature.

Q. The solubility product $Mg(OH{)}_2$ and $Al(OH{)}_3$ in water at ${25}^{\circ }C$ are $2.56\times {10}^{-13}$ and $4.32\times {10}^{-34}$ . If $s_1$ and $s_2$ are the solubilities of $Mg(OH{)}_2$ and $Al(OH{)}_3$ in water in mol/L at ${25}^{\circ }C$ what is the ratio $s_1/s_2$ ?

1. $2\times {10}^5$
2. $2\times {10}^4$
3. $3\times {10}^6$
4. $3\times {10}^3$

Q. In chromotography technique, the purification of compound is independent of:

1. Mobility or flow of solvent system
2. Solubility of the compound
3. Length of the column or TLC plate
4. Physical state of the pure compound

Q. State Henrys law and mention its imp. applications ??

Q. CH3CHO and CH3COCH3 can not be distinguished by : (1) Fehling solution (2) Grignard reagent (3) Schiffs reagent (4) Tollens reagent (Explain about each option to clear concept)

Q.

Calculate the mass percentage of solution if 11 g of oxalic acid are dissolved in 500 mL.

Q. When a chalk stick is dipped in ink, then

1. The coloured pigments in the ink get absorbed in the chalk
2. The solvent got adsorbed at the surface of chalk
3. Inside of the chalk will remain as white while the surface will have coloured pigment
4. Inside of the chalk will have coloured pigments while the surface will remain white.

Q.

Whether the solubility of ammonium chloride in water increases on increasing temperature. Why?

Q.

If 110 g of salt is present in 550 g of solution, then calculate the concentration of the solution.

Q.

Answer in brief:

How does temperature affects the solubility of a solute in solvent?

Q.

Which among the following liquids shows convex meniscus in a glass tube?

1. Water

2. Hydrochloric acid

3. Alcohol

4. Carbon tetrachloride

Q. A saturated solution of iodine in water is $1.25\times {10}^{-3}\text{(M)}$. In any saturated solution of $I_2$, concentration of $I_2$ is $1.25\times {10}^{-3}\text{(M)}$. In $1\text{L}$ of $0.1\text{(M)}$ solution of $I^{-}$, it is seen maximum $51.25\times {10}^{-3}\text{mole}$ of $I_2$ can be dissolved. In the aqueous solution, $I^{-}\left(aq\right),I_2\left(aq\right)$ undergo complex formation,


What is the value of $K_C$?

1. $750$
2. $800$
3. $\frac{1000}{51.25}$
4. $1$

Q. What is retrograde solubility?
(Charcter of gypsum)

Q.

Graphite is insoluble in all solvents.

1. True
2. False

Q.

Is $\mathrm{KF}$ soluble in water?