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NEET UG Chemistry — practice by topic

Browse 3,172 questions across 55 Chemistry topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Which combination correctly matches the two processes described in the notes for a galvanic cell?Read the answer and worked solution →The potential developed between the zinc rod and the solution due to its tendency to undergo oxidation is calledRead the answer and worked solution →According to the octet rule, atoms achieve stability by attaining an outer shell configuration of:Read the answer and worked solution →The number of valence electrons in the Lewis dot symbol of nitrogen is:Read the answer and worked solution →

Worked practice questions

Which combination correctly matches the two processes described in the notes for a galvanic cell?

  1. Anode: reduction; Cathode: oxidation
  2. Anode: oxidation; Cathode: reduction
  3. Both electrodes: oxidation only
  4. Both electrodes: reduction only
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Correct answer: B. Anode: oxidation; Cathode: reduction

The notes identify zinc oxidation at the anode and copper ion reduction as the reduction process. **Thus, in a galvanic cell, oxidation occurs at the anode and reduction occurs at the cathode.**

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The potential developed between the zinc rod and the solution due to its tendency to undergo oxidation is called

  1. reduction potential
  2. oxidation potential
  3. ionic mobility
  4. transport number
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Correct answer: B. oxidation potential

The notes explicitly define the potential developed between the rod and the solution in this case as oxidation potential, represented by $E(Zn/Zn^{2+})$.

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According to the octet rule, atoms achieve stability by attaining an outer shell configuration of:

  1. ns² np²
  2. ns² np⁴
  3. ns² np⁶
  4. ns¹ np⁵
Show answer and solution

Correct answer: C. ns² np⁶

The octet rule states atoms achieve stability by attaining a noble-gas outer shell of **eight valence electrons (ns² np⁶)**. Helium is the exception with a duplet.

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