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Acids, Bases, Salts and Redox Questions for NDA

Free, AI-curated practice for the Acids, Bases, Salts and Redox section of NDA. We have 12+ verified questions in this bank. Below: 5 sample questions. Sign up free to unlock unlimited practice + AI explanations + per-topic analytics.

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Sample questions

Q1 · medium · AI-verified
What is the oxidation number of Cr in K₂Cr₂O₇?
  1. +3
  2. +6
  3. +7
  4. +4
Q2 · medium · AI-verified
In the reaction: Zn + 2HCl → ZnCl₂ + H₂, the oxidation state of zinc changes from:
  1. 0 to -2
  2. +2 to 0
  3. +1 to +2
  4. 0 to +2
Q3 · medium · AI-verified
In the electrolysis of water (acidified), which gas is produced at the cathode?
  1. Oxygen (O₂)
  2. Ozone (O₃)
  3. Hydrogen (H₂)
  4. Chlorine (Cl₂)
Q4 · medium · AI-verified
What is the oxidation number of nitrogen in NH₄⁺?
  1. +5
  2. -3
  3. +3
  4. 0
Q5 · medium · AI-verified
What is the oxidation state of manganese (Mn) in potassium permanganate (KMnO₄)?
  1. +6
  2. +2
  3. +7
  4. +4
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