Which of the following statements about electrochemical cells is true? a) Oxidat

Question

Which of the following statements about electrochemical cells is true? a) Oxidation occurs at the anode b) Reduction occurs at the anode c) The reaction in each of the half-cell can occur independently without electrical connection d) The reaction in each of the half-cell can spontaneously occur when the cell potential becomes negative Regarding to the fluorescence intensity, which of the following statements is True? a) Increase in temperature will increase the fluorescence intensity b) A rigid molecular structure usually reduce fluorescence intensity because it has limited vibrational modes c) Increase in solvent viscosity will increase the fluorescence intensity d) Decrease in solvent viscosity will increase the fluorescence intensity KMnO_4 and Ce^4+ are two standard oxidation agents with comparable oxidizing strength. Which of the following statement about these two oxidation agents is true ? (a) KMnO_4 has better stability in solution than Ce^4+ (b) KMnO_4 can be used as indicator, but Ce^4+ cannot (c) KMnO_4 can be used to titrate HCl, but Ce^4+ cannot (d) KMnO_4 can be used as primary standard, but Ce^4+ cannot Show Answer Balance the following net ionic equation. Show how you balance it. Cr_2O_7^2- + SO_2 + H^+ rightarrow Cr5^3+ + HSO_4^- + H_2O

Explanation / Answer

7.

In a elctrochemical cell, Oxidation occurs at anode by loosing electron by metal and at cathode , reduction occurs.

Hence the option (a) is correct answer.

Always oxidation occurs at anode.

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