NEET UG CHEMISTRY Multiple Choice Questions (MCQs)
NEET UG - Physical Chemistry Unit 7: Redox Reactions and Electrochemistry
91. What is the electronic concept of oxidation?
- a) Loss of electrons
- b) Gain of electrons
- c) Loss of protons
- d) Gain of protons
Answer: a) Loss of electrons
92. Which of the following is the correct rule for assigning oxidation numbers?
- a) The oxidation number of hydrogen is always -1
- b) The oxidation number of oxygen is always +1
- c) The oxidation number of an element in its free state is zero
- d) The oxidation number of fluorine is always +1
Answer: c) The oxidation number of an element in its free state is zero
93. In a redox reaction, which species is reduced?
- a) The species that loses electrons
- b) The species that gains electrons
- c) The species that gains protons
- d) The species that loses protons
Answer: b) The species that gains electrons
94. Which of the following represents the oxidation number of sulfur in H2SO4?
- a) +2
- b) +4
- c) +6
- d) -2
Answer: c) +6
95. Which method is used to balance redox reactions in acidic medium?
- a) Oxidation number method
- b) Ion-electron method
- c) Half-reaction method
- d) Algebraic method
Answer: b) Ion-electron method
96. What is the unit of electrical conductance in electrolytic solutions?
- a) Ohm
- b) Ampere
- c) Siemens
- d) Volt
Answer: c) Siemens
97. What does Kohlrausch's law relate to?
- a) Molar conductivity at infinite dilution
- b) Specific conductivity
- c) Cell potential
- d) Nernst equation
Answer: a) Molar conductivity at infinite dilution
98. What is the term used for the difference in potential between two half-cells in an electrochemical cell?
- a) Standard electrode potential
- b) Electromotive force (emf)
- c) Half-cell potential
- d) Nernst potential
Answer: b) Electromotive force (emf)
99. Which of the following is a Galvanic cell?
- a) Electrolytic cell
- b) Dry cell
- c) Lead accumulator
- d) Hydrogen-oxygen fuel cell
Answer: d) Hydrogen-oxygen fuel cell
100. In a Galvanic cell, what occurs at the anode?
- a) Reduction
- b) Oxidation
- c) Discharge of electrons
- d) Movement of ions
Answer: b) Oxidation
101. Which of the following is the correct relationship between cell potential and Gibbs free energy change?
- a) ΔG = -nFE
- b) ΔG = nFE
- c) ΔG = -FE
- d) ΔG = nF/E
Answer: a) ΔG = -nFE
102. What is the Nernst equation used to calculate in an electrochemical cell?
- a) Gibbs free energy
- b) Equilibrium constant
- c) Cell potential at non-standard conditions
- d) Ion concentration
Answer: c) Cell potential at non-standard conditions
103. What is the role of the salt bridge in an electrochemical cell?
- a) To provide the electrons to the cathode
- b) To complete the electrical circuit
- c) To maintain a constant temperature
- d) To supply ions to the anode
Answer: b) To complete the electrical circuit
104. Which of the following is a primary component of a lead accumulator?
- a) Zinc
- b) Lead dioxide
- c) Copper
- d) Silver
Answer: b) Lead dioxide
105. Which of the following is an example of an electrolytic cell?
- a) Daniell cell
- b) Lead accumulator
- c) Dry cell
- d) Chlor-alkali process
Answer: d) Chlor-alkali process
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