Factors Affecting Conductance

Q.

An acidic solution of $C{u}^{2+}$ salt containing 0.4 g of $C{u}^{2+}$ (CuSO₄) is electrolysed until all the Cu is deposited. The electrolysis is continued for seven more minutes with the volume of solution kept at 100 ml and the current at 1.2 Ampere. Calculate volume of gases evolved at N.T.P at anode during entire electrolysis.

1. 44.56 ml

2. 99.68 ml

3. 12 ml

4. 34 ml

Q. Which of the following are strong electrolytes?

1. $H_{2}S{O}_4$
2. $NaOH$
3. $Urea$
4. $Benzene$

Q. In the electrolysis of water
(A) name the gas collected at anode and cathode.
(B) why is dilute H2SO4 isadded to water
(C) why is the volume of gas collected at one electrode double than the other

Q.

The factors which affect the conductivity of a solution are ___.

1. Dilution

2. Nature of electrolyte

3. Temperature

4. None of these

Q. What are the types of electrolytes?

Q. Classify the following :
1)$HCl$
2) $C{H}_{3}COOH$
3) $C{H}_{3}COONa$
4) Rubber
5) Common Salt
M- Strong Electrolyte N- Weak Electrolyte
O - Non-Electrolyte

1. M – 1, 2; N – 3, 4; O – 5
2. M – 1, 2, 3; N – 4; O – 5
3. M – 1, 2, 3, 5; O – 4
4. M – 1, 3, 5; N – 2; O – 4

Q. A white salt soluble in $N{H}_{4}OH$ but insoluble in water is :

1. $BaS{O}_4$
2. $CuS{O}_4$
3. $PbS{O}_4$
4. $AgCl$

Q. $N{a}_{2}C{O}_3$ is thermally stable but $L{i}_{2}C{O}_3$ is not.

1. True
2. False

Q. Name a salt which is a weak electrolyte.

Q. (A) gives white ppt with $AgN{O}_3$ soluble in aq $N{H}_3$. (A) gives green ppt (B) with NaOH but ppt dissolves to yellow solution (C) when heated with $H_2{O}_2$. (C) gives yellow ppt (D) with $BaC{l}_2$.
According to above experiment complete the matrix.

Q. Capacity of solvent to neutralise charge on ionic compound is called :-

1. Solvation energy
2. Dielectric constant
3. Dipole moment
4. Solubility

Q. Why does hydrogen get deposited at the cathode instead of sodium and chlorine at the anode instead of oxygen during the electolysis of aqueous sodium chloride. What is overvoltage?

Q. 1)$HCl$ 2) $C{H}_{3}COOH$ 3) $C{H}_{3}COONa$ 4) Rubber 5) common salt
(m) Strong electrolyte (n) Weak electrolyte (o) non-electrolyte

1. m – 1, 2; n – 3, 4; o – 5
2. m – 1, 2, 3, 5; o – 4
3. m – 1, 3, 5; n – 2; o – 4
4. m – 1, 2, 3; n – 4; o – 5

Q. When a dilute aqueous solution of sodium chloride is electrolysed between platinum electrodes hydrogen gas is evolved at the cathode but metallic sodium is not deposited.why?

Q.

The factor which does not affect the conductivity of any solution is

1. Dilution

2. None of these

3. Nature of electrolyte

4. Temperature

Q. 1)$HCl$ 2) $C{H}_{3}COOH$ 3) $C{H}_{3}COONa$ 4) Rubber 5) Common Salt
(m) Strong Electrolyte (n) Weak Electrolyte (o) Non-Electrolyte

1. m – 1, 2; n – 3, 4; o – 5
2. m – 1, 2, 3, 5; o – 4
3. m – 1, 3, 5; n – 2; o – 4
4. m – 1, 2, 3; n – 4; o – 5

Q.

Why are KCl and NH₄NO₃ inert electrolytes?

Q.

The standard electrode potentials(reduction) of Fe+3, Fe+2/Pt and Sn+4, Sn+2/Pt are + 0.77V and 0.15V respectively at 25oC. The standard EMF of the reaction Sn+4 +2Fe+2 --- Sn+2 + 2Fe+3 is what?

Q. $A{l}_2(S{O}_4{)}_3+N{H}_{4}OH\to X$, then $X$ is :

1. soluble in NaOH
2. a white coloured compound
3. insoluble in excess of $N{H}_{4}OH$
4. cannot be used as an antacid

Q. Read the above short write up and answer subsequent questions based on observations $\left(A\right)$ to $\left(J\right)$.

1. (A) (i) and (iii)
2. (B) (i) and (ii)
3. (C) (i) and (iv)
4. (D) (iii) and (iv)

Q.

Which of the following are strong electrolytes?

1. $H_{2}S{O}_4$
2. $NaOH$
3. $Urea$
4. $benzene$

Q. Conductivity of solution always decreases with decrease in concentration, both for weak and strong electrolytes.

1. True
2. False

Q.

Which one of the following statements is correct?

1. The specific conductance of an electrolyte solution decreases with increase in dilution

2. 
   

3. 
   

4. The oxidation number of oxygen in KO₂ is zero