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NEET UG Classification of Elements and Periodicity in Properties — practice questions — page 2

Explore 38 free Classification of Elements and Periodicity in Properties questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Classification of Elements and Periodicity in Properties questions and exercises with answers

Showing questions 31–38 of 38.

In an electrochemical (galvanic) cell, oxidation occurs at the:Read the answer and worked solution →Balance the skeleton equation MnO₄⁻ + Fe²⁺ + H⁺ → Mn²⁺ + Fe³⁺ + H₂O. The coefficient of MnO₄⁻ is:Read the answer and worked solution →Standard hydrogen electrode (SHE) is assigned electrode potential:Read the answer and worked solution →An element shows the SAME oxidation number in all its compounds. Which is it?Read the answer and worked solution →In the half-reaction 2 H₂O → O₂ + 4 H⁺ + 4 e⁻, water acts as:Read the answer and worked solution →The n-factor of KMnO₄ in acidic medium (Mn⁷⁺ → Mn²⁺) is:Read the answer and worked solution →Hydrogen peroxide (H₂O₂) can act both as an oxidising agent AND as a reducing agent because:Read the answer and worked solution →In KO₂ (potassium superoxide), the oxidation state of oxygen is:Read the answer and worked solution →

Worked practice questions

In an electrochemical (galvanic) cell, oxidation occurs at the:

  1. Cathode
  2. Anode
  3. Salt bridge
  4. External wire
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Correct answer: B. Anode

1. Mnemonic: 'an OX is a RED CAT' — Oxidation at Anode; Reduction at Cathode. 2. In a galvanic cell, the anode is the NEGATIVE terminal (where electrons leave the cell into the wire). 3. In an electrolytic cell, the SIGN flips but the rule 'anode = oxidation' is the same. _Source: syllabus Chem Ch 8 §8.4 Redox in Electrochemical Cells_

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Balance the skeleton equation MnO₄⁻ + Fe²⁺ + H⁺ → Mn²⁺ + Fe³⁺ + H₂O. The coefficient of MnO₄⁻ is:

  1. 1
  2. 2
  3. 3
  4. 5
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Correct answer: A. 1

1. Mn: +7 → +2 (gain 5 e⁻); Fe: +2 → +3 (lose 1 e⁻). 2. Multiply Fe half by 5 to balance electrons. 3. Balanced: MnO₄⁻ + 5 Fe²⁺ + 8 H⁺ → Mn²⁺ + 5 Fe³⁺ + 4 H₂O. 4. Coefficient of MnO₄⁻ is 1. _Source: syllabus Chem Ch 8 §8.3 Balancing Redox Equations_

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Standard hydrogen electrode (SHE) is assigned electrode potential:

  1. +1.00 V
  2. −1.00 V
  3. 0.00 V
  4. 0.76 V
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Correct answer: C. 0.00 V

1. By convention, the SHE (1 M H⁺, 1 atm H₂, 25 °C) is assigned E° = 0.00 V exactly. 2. All other electrode potentials are reported relative to this reference. 3. The 0.76 V is the E° for Zn²⁺/Zn (reduction potential −0.76 V; cell against SHE is +0.76 V). _Source: syllabus Chem Ch 8 §8.4 Standard Hydrogen Electrode_

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