Ostwald Dilution Law

Q.

State Ostwalds dilution law.

Q.

If the concentration of hydrogen ion in a sample of soft drink is$3.8\times {10}^{–3}\mathrm{m}$.What will be its $\mathrm{pH}$?

1. 2.42

2. 2.82

3. 3.08

4. None Of These

Q. Which of the following compounds can be used as antifreeze in automobile radiators?

1. Methyl alcohol
2. Glycol
3. Nitrophenol
4. Ethyl alcohol

Q.

$1\mathrm{molal}$ aqueous solution of an electrolyte ${\mathrm{A}}_2{\mathrm{B}}_3$ is $60\%$ ionised. The boiling point of the solution at $1\mathrm{atm}$ is $\mathrm{\_\_\_\_\_}\mathrm{K}$.

Q. The coagulating power of electrolytes having $N{a}^{+}.A{l}^{3+}$ and $B{a}^{2+}$ for arsenic sulphide sol increases in the order

1. $A{l}^{3+}<B{a}^{2+}<N{a}^{+}$
   
2. $B{a}^{2+}<N{a}^{2+}<A{l}^{3+}$
   
3. $A{l}^{3+}<N{a}^{+}<B{a}^{2+}$
4. $N{a}^{+}<B{a}^{2+}<A{l}^{3+}$
   

Q.

Oswalds dilution law is applicable for both weak electrolytes and strong electrolytes- True or False?

1. False

2. True

Q. consider the reaction KClO3+6FeSO4+3H2SO4\xrightarrow[{}]{}KCl+3Fe2(So4)3+3H2O if concentration of FeSO4 decreases from 0.9M to 0.3M in 10seconds , the rate of formation of KCl in the above reaction

Q.

If $\alpha$ is the degree of ionization, $C$ the concentration of a weak electrolyte and $K_a$ the acid ionization constant, then the correct relationship between $\alpha$, Cand $K_a$ is

1. ² = √(K_a x C).

2. ² = √(C / K_a)

3. = √(K_a / C).

4. = √(C / K_a)

Q. The hydrogen ion concentration Of a 10^(-6) M hcl aqueous solution at 298K is

Q.

Is NaH a stronger base than NaOH?

Q. The value of molar conductivity of HCl is greater than that of NaCl at a particular temperature because
(1) molecular mass of HCl is less than that of NaCl
(2) velocity of H+ ion is more than that of Na+ ions
(3) HCl is strongly acidic
(4) ionisation of HCl is larger than that of NaCl

Q.

Total number of moles for the reaction $2HI\leftrightharpoons H_2+I_2$ if $\alpha$ is degree of

dissociation is

1. 2

2. 1

3. 2 -

4. 1 - ​

Q. Why does dissociation rate of Hydrogen sulphide (H2S) is decreased in presence of HCl in aqueous solution?

Q. Calculate $pH$ of $1.0MP{O}_4^{3-}$ in aqueous solution. Given $p{K}_{b}ofP{O}_4^{3-}=1.62$.

1. 13.19
2. 7
3. 6.5
4. 11.5

Q. For the following reactions, equilibrium constants are given:

$S\left(s\right)+O_2\left(g\right)\rightleftharpoons S{O}_2\left(g\right);K_1={10}^{52}$

$2S\left(s\right)+3O_2\left(g\right)\rightleftharpoons 2S{O}_3\left(g\right);K_2={10}^{129}$
Find the equilibrium constant for
$2S{O}_2+O_2\left(g\right)\rightleftharpoons 2S{O}_3\left(g\right);K_3$

1. ${10}^{181}$

2. ${10}^{154}$
3. ${10}^{25}$
4. ${10}^{77}$

Q. What will be the acidity of Magnesium hydroxide?

1. 1
2. 0
3. 2
4. 3

Q. For a reactions, the equilibrium constant $\left(K\right)$ values are given:
$A\rightleftharpoons B;K_1=2B\rightleftharpoons C;K_2=4C\rightleftharpoons D;K_3=3$
Then calculate the equilibrium constant for the reaction $A\rightleftharpoons D$:

1. $48$
2. $6$
3. $24$
4. $12$

Q. Find the dissociation constant $K_a$ of a weak monobasic acid which is 3.5 % dissociated in a $\frac{N}{10}$ solution at ${25}^{\circ }C.$

1. $1.23\times {10}^{-4}$
2. $1.26\times {10}^{-6}$
3. $3.40\times {10}^{-4}$
4. $4.20\times {10}^{-3}$

Q. The dissociation constant for a weak monobasic acid is $4\times {10}^{-10}.pH$ for this $0.01N$ weak monobasic acid is :

1. 9.7
2. 1.7
3. 3.7
4. 5.7

Q. Given:
$N_2\left(g\right)+3H_2\left(g\right)\rightleftharpoons 2N{H}_3\left(g\right);K_1$
$N_2\left(g\right)+O_2\left(g\right)\rightleftharpoons 2NO\left(g\right);K_2$
$H_2\left(g\right)+\frac{1}{2}{O}_2\left(g\right)\rightleftharpoons H_{2}O\left(g\right);K_3$
Calculate the equilibrium constant for the reaction,
$2N{H}_3\left(g\right)+\frac{5}{2}{O}_2\left(g\right)\rightleftharpoons 2NO\left(g\right)+3H_{2}O\left(g\right)$

1. $K_1{K}_2{K}_3$
2. $\frac{K_1{K}_2^3}{K_3}$
3. $\frac{K_1{K}_3^2}{K_2}$
4. $\frac{K_2{K}_3^3}{K_1}$

Q. ntnttntttntttt ntttttThe standard reduction potential of Ag+|Ag is 0.800 V at 25^°C. Its electrode potential in a solution containing 103M ion of Ag+ions is:-ntttnttntnn ntnttntttnttttnttttt(1)nttttnttttt0.623 Vntttntttnttttnttttt(2)nttttnttttt0.977 Vntttntttnttttnttttt(3)nttttnttttt0.892 Vntttntttnttttnttttt(4)nttttnttttt1.246 Vntttnttntnn ntn

Q.

pH of a buffer containing 6.0 g of \(CH_3 COOH\) and 8.2 g of \(CH_3 COONa\) in 1 L of water is ($p{K}_a$ = 4.5)

1. 7.5

2. 4.5

3. 5.5

4. 6.5

Q. If $K_{sp}$ of a salt $A_2{B}_3$ is given by $1\times {10}^{-25}$. Then find the $s^5$ of the salt?
Here 's' is solubility.

1. $\frac{{10}^{-2}}{108}$
2. ${10}^{-5}$
3. $\frac{{10}^{-5}}{108}$
4. $\frac{{10}^{-25}}{108}$

Q. Solubility product (KSP) of salts of types $MX,M{X}_2$ and $M_{3}X$ at temperature T are $4\times {10}^{-8},3.2\times {10}^{-14}$ and $2.7\times {10}^{-15}$ respectively, solubility of salts at temperature T are in order

1. $M_{3}X>M{X}_2>MX$
2. $MX>M_{3}X>M{X}_2$
3. $MX>M{X}_2>M_{3}X$
4. $M{X}_2>M_{3}X>MX$

Q.

What is the hydrogen ion concentration of a solution whose pH is 3.70?

1. 6.0 x 10^-5

2. 8.0 x 10^-2

3. 2.0 x 10^-4

4. 4.0 x 10^-3

Q. The comparison of acidic strengths of two monobasic acids may be done by comparing the hydronium ion concentrations of their aqueous solution of the same molar concentration. The dissociation constants of the acids $HA$ and $HB$ are $4\times {10}^{-6}$ and $2.5\times {10}^{-9}$ respectively. How many times is $HA$ stronger than $HB$?
Assume that for both the acids, the degree of dissociation at the concentration taken is negligible.

Q. Oswalds dilution law is applicable for electrolytes.

1. weak
2. strong
3. non

Q.

Oswalds dilution law is applicable for both weak electrolytes and strong electrolytes- True or False?

1. True

2. False

Q. Oswalds dilution law is applicable for electrolytes.

1. weak
2. strong
3. non

Q. At ${25}^{o}C$, the ionic mobility of $C{H}_{3}CO{O}^{-}$, $H^{+}$ are respectively $4.1\times {10}^{-4}$, $3.63\times {10}^{-3}cm/sec$ the conductivity of $0.001MC{H}_{3}COOH$ is $5\times {10}^{-5}S.c{m}^{-1}$. Dissociation constant of $C{H}_{3}COOH$ is :