HSC Science कक्षा १२ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

Assertion: pure iron when heated in dry air is converted with a layer of rust.

Reason: Rust has the compositionFe₃O₄.

In the electrochemical cell: Zn|ZnSO₄ (0.01 M)||CuSO₄ (1.0 M)|Cu, the emf of this Daniel cell is E₁. When the concentration of ZnSO₄ is changed to 1.0 M and that CuSO₄ changed to 0.01 M, the emf changes to E₂. From the above, which one is the relationship between E₁ and E₂?

Consider the change in the oxidation state of Bromine corresponding to different emf values as shown in the expression below:

\[\ce{BrO^-_4 ->[1.82 V] BrO^-_3 ->[1.5 V] HBrO ->[1.595 V] Br2 ->[1.0652 V] Br^-}\]

Then the species undergoing disproportionation is:

A certain current liberated 0.504 gm of hydrogen in 2 hours. How many grams of copper can be liberated by the same current flowing for the same time through copper sulphate solution.

Cell equation: \[\ce{A + 2B^- -> A^{2+} + 2B}\]

\[\ce{A^{2+} + 2e^- -> A}\] E⁰ = +0.34 V and log₁₀ k = 15.6 at 300 K for cell reactions find E⁰ for \[\ce{B^+ + e^- -> B}\]

A gas X at 1 atm is bubbled through a solution containing a mixture of 1 MY⁻ and 1 MZ⁻ at 25°C. If the reduction potential of Z > Y > X, then ______.

Define anode

Define cathode

Describe the electrolysis of molten NaCl using inert electrodes.

Describe the construction of Daniel cell. Write the cell reaction.

Why is anode in galvanic cell considered to be negative and cathode positive electrode?

Can Fe³⁺ oxidises bromide to bromine under standard conditions?

Given: \[\ce{E^0_{{Fe^{3+}|Fe^{2+}}}}\] = 0.771 V

\[\ce{E^0_{{Br_{2}|Br^-}}}\] = −1.09 V

Is it possible to store copper sulphate in an iron vessel for a long time?

Given: \[\ce{E^0_{{Cu^{2+}|{Cu}}}}\] = 0.34 V and \[\ce{E^0_{{Fe^{2+}|{Fe}}}}\] = −0.44 V

Two metals M₁ and M₂ have reduction potential values of −xV and +yV respectively. Which will liberate H₂ and H₂SO₄.

Reduction potential of two metals M₁ and M₂ are \[\ce{E^0_{{M_1^{2+}|M_1}}}\] = −2.3 V and \[\ce{E^0_{{M_2^{2+}|M_2}}}\] = 0.2 V. Predict which one is better for coating the surface of iron.
Given: \[\ce{E^0_{{Fe^{2+}|Fe}}}\] = −0.44 V

A copper electrode is dipped in 0.1 M copper sulphate solution at 25°C. Calculate the electrode potential of copper.
[Given: \[\ce{E^0_{{Cu^{2+}|Cu}}}\] = 0.34 V]

For the cell \[\ce{Mg_{(s)}|Mg^{2+}_{( aq)}||Ag^+_{( aq)}|Ag_{(s)}}\], calculate the equilibrium constant at 25°C and maximum work that can be obtained during operation of cell.
Given: \[\ce{E^0_{{Mg^{2+}|Mg}}}\] = −2.37 V and \[\ce{E^0_{{Ag^{+}|Ag}}}\] = 0.80 V

Write a note on sacrificial protection.

What are the functions of lipids in living organisms?

Write a note on synthetic detergents.