Exams › NEET › Chemistry

The measured potential for \( M g^{2+}+2 e^{-} \rightleftharpoons M g(s) \) does not depend upon:

1. raising the temperature
2. increasing the concentration of \( M g^{2+} \) ions
3. making the magnesium plate bigger
4. purity of magnesium plate

Correct answer: making the magnesium plate bigger

Solution

For the half-cell Mg^{2+} + 2e^- ⇌ Mg(s), the electrode potential depends on ion activity and temperature. The size of the solid magnesium electrode does not enter the Nernst equation, so making the plate bigger does not change the measured potential.

Related NEET Chemistry questions

• Assertion: When an electric current is passed through the copper sulphate electrolyte, the impure copper anode gradually dissolve and pure copper is deposited on the cathode. Reason: Pure metals are deposited in electroplating techniques.
• What is the electric current required to deposit 0.972 g of chromium in three hours? (E.C.E. of chromium is 0.00018 g/c)
• Which of the following statement (s) differentiate between electrochemical cell and electrolytic cell? This question has multiple correct options
• Among the following, the couple with most positive reduction potential is :
• The resistance of \( 1 \mathrm{N} \) solution of acetic acid is \( 250 \Omega \) when measured in a cell having a cell constant of \( 1.15 \mathrm{cm}^{-1} . \) The equivalent conduction (in oh \( m^{-1} c m^{2} e q u i v^{-1} \) ) of \( 1 N \) acetic acid is
• If \( 9 g m H_{2} O \) is electrolysed completely with the current of \( 50 \% \) efficiency then :

⚔️ Practice NEET Chemistry free + battle 1v1 →