Each of the three metals X, Y and Z were put in turn into aqueous solution of the other two.

X + Salt of Y (or Z) ⟶  Y (or Z) + Salt of X.

Which observation is probably incorrect?

1. Y + Salt of X = No action observed

2. Y + Salt of Z = Z + Salt of Y

3. Z + Salt of X = X + Salt of Z

4. Z + Salt of Y = No action observed

The standard reduction potentials of Cu²⁺/Cu and Cu²⁺/Cu⁺ are 0.337 and 0.153V respectively. The standard electrode potential of Cu⁺/Cu half cell is:

1. 0.184V 

2. 0.827V

3. 0.521V

4. 0.490V

When a lead storage battery is discharged, then:

1. SO₂ is evolved.

2. Lead is formed.

3. Lead sulphate is consumed.

4. Sulphuric acid is consumed.

The ratio of masses of hydrogen and magnesium deposited by the same amount of electricity from H₂SO₄ and MgSO₄ in aqueous solution are:

1. 1:8

2. 1:12

3. 1:16

4. none of these

The molar conductances of Ba²⁺ and Cl^- 127 and 76Ω^-1 cm^-1 mol^-1 respectively at infinite dilution. The equivalent conductance of BaCl₂ at infinite dilution will be

1. 139.52

2. 203

3. 279

4. 101.5

A depolariser used in dry cell batteries is: 

1. Ammonium chloride 

2. Manganese dioxide

3. Potassium hydroxide 

4. Sodium phosphate

The reaction taking place  at anode when an aqueous solution of CuSO₄ is electrolysed using inert Pt electrode:

1. 2${\mathrm{SO}}_4^{2-}$ $\to$ S₂${\mathrm{O}}_3^{2-}$ + 2e

2. Cu²⁺ + 2e $\to$Cu

3. 2H₂O $\to$ O₂ + 4H⁺ + 4e

4. 2H⁺ +2e $\to$ H₂

An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to

1. increase in ionic mobility of ions

2. 100% ionisation of electrolyte at normal dilution

3. increase in both, i.e. number of ions and ionic mobility of ions

4. increase in number of ions

For the cell, Ti|Ti⁺(0.001M)||Cu²⁺(0.1M)|Cu,E_cell at 25$°$C is 0.83 V. E_cell can be increased:

1. By increasing [Cu²⁺]

2. By increasing [Ti⁺]

3. By decreasing [Cu²⁺]

4. None of these