Weak electrolytes have lower degree of dissociation at higher concentrations and hence for such electrolytes, the change in Λm with dilution is due to increase in the degree of dissociation and consequently the number of ions in total volume of solution that contains 1 mol of electrolyte. Inert electrodes do not participate in the reaction but provide their surface for oxidation or reduction reactions and for the conduction of electrons. E(cell) depends on the concentration of both Cu2+ and Zn2+ ions. The products of electrolysis of molten sodium chloride are sodium metal and chlorine gas. Students can solve NCERT Class 12 Chemistry Electrochemistry MCQs Pdf with Answers to know their preparation level. At 298 K, Eom (KCl) - Eom (NaCl) = Eom (KBr) - Eom (NaBr) = Eom (KI) - Eom (NaI) ≈ 23.4 S cm2 mol–1 Kohlrausch observed certain regularities for a number of strong electrolytes. It has a negative potential with respect to the solution. The degree of dissociation of week electrolyte increases as_____? electrochemistry; cbse; class-12; Share It On Facebook Twitter Email. Standard hydrogen potential is zero at all temperatures. The competing reduction reaction at the cathode during the electrolysis of aqueous sodium chloride is H+ (aq) + e– → ½ H2 (g). The molar conductivity of a weak electrolyte remains approximately constant as the concentration increases. Reason: For weak electrolytes degree of dissociation increases with dilution of solution. The electrolyte used may be solution or melt. Tin is less reactive than iron, while sodium is highly reactive and catches fire when subjected to air and moisture. One mole of Mg2+ requires 2 moles of electron that is 2 Faraday. Corrosion is also prevented by covering the surface of the metal by other inert metals. The magnitude of conductivity depends on nature of the material and the temperature at which the measurements are made. Bisphenol is commonly used to prevent corrosion in the cans used for storage of food and beverages. Since corrosion involves redox reaction with release of energy used for non-spontaneous chemical reaction, it is an electrochemical phenomenon. Assertion: Am for weak electrolytes shows a sharp increase when the electrolytic solution is diluted. Pure water has small amounts of hydrogen and hydroxyl ions (~10–7M) which lend it very low conductivity (3.5 × 10–5 S m–1). Chemistry MCQs for Class 12 Chapter Wise with Answers, Teenage Pregnancy Essay | Essay on Teenage Pregnancy for Students and Children in English, Animal Right Essay | Essay on Animal Right for Students and Children in English, Water Conservation Slogans | Unique and Catchy Water Conservation Slogans in English, Slogans on Pollution | Unique and Catchy Slogans on Pollution in English, Maths Formulas for Class 11 PDF Download Free | 11th Std Maths Formulae List, Maths Formulas for Class 6 | List of 6th Class Math Formulae, Maths Formulas for Class 9 PDF Free Download | Important 9th Grade Maths Formulae, Maths Formulas for Class 8 PDF Download Free | 8th Grade Math Formula List, Maths Formulas for Class 7 PDF Download Free | 7th Class Math Formulae, Basic Chemistry Formulas Sheet | Important Chemistry Formula Chart & Tables, https://www.youtube.com/watch?v=nd-0HFd58P8. The two different portions of the Daniell cell on which the two half reactions occurs are called as half-cells. The degree of dissociation of week electrolyte increases as_____? In a galvanic cell, the half-cell in which oxidation takes place is called anode. Log in. Gold is also used as inert electrode. Chemistry MCQs for Class 12 Chapter Wise It cannot be unity. At infinite dilution, a weak electrolyte is taken to be fully ionized. Magnesium is used as a sacrificial electrode to prevent corrosion.

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