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AP Intermediate 1st Year Classification of Elements and Periodicity in Properties — practice questions — page 2

Explore 50 free Classification of Elements and Periodicity in Properties questions in AP Intermediate 1st Year 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 31–50 of 50.

Le Chatelier's principle states that a system at equilibrium under stress:Read the answer and worked solution →If Q (reaction quotient) > K_c at some instant, the reaction will:Read the answer and worked solution →According to Brønsted-Lowry, an acid is a substance that:Read the answer and worked solution →For the dissociation of a weak acid HA, the degree of dissociation α is given (approximately, when α ≪ 1) by:Read the answer and worked solution →Oxidation in modern terms is defined as:Read the answer and worked solution →The oxidation state of sulphur in SO₄²⁻ is:Read the answer and worked solution →The oxidation state of manganese in KMnO₄ is:Read the answer and worked solution →In Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag, the species oxidised is:Read the answer and worked solution →A reducing agent is a substance that:Read the answer and worked solution →Identify the redox reaction:Read the answer and worked solution →The disproportionation of chlorine in cold dilute NaOH (3 Cl₂ + 6 OH⁻ → 5 Cl⁻ + ClO₃⁻ + 3 H₂O is the hot reaction). At cold and dilute conditions, Cl₂ + 2 OH⁻ →:Read the answer and worked solution →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 →Line up three from one blockRead the answer and worked solution →

Worked practice questions

Le Chatelier's principle states that a system at equilibrium under stress:

  1. Stays at the original equilibrium
  2. Shifts to oppose and minimise the stress
  3. Increases the rate forward only
  4. Becomes a non-equilibrium system permanently
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Correct answer: B. Shifts to oppose and minimise the stress

1. Le Chatelier: when an external stress (change in T, P, concentration) is applied to a system at equilibrium, the system shifts to OPPOSE and minimise the stress. 2. The system reaches a new equilibrium state. 3. It does NOT stay at the old equilibrium — that's the whole point. _Source: syllabus Chem Ch 7 §7.6 Le Chatelier's Principle_

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If Q (reaction quotient) > K_c at some instant, the reaction will:

  1. Proceed forward only
  2. Be at equilibrium now
  3. Reverse to make reactants
  4. Stop the reaction entirely
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Correct answer: C. Reverse to make reactants

1. Q < K → forward direction favoured (too few products). 2. Q = K → already at equilibrium. 3. Q > K → reverse direction favoured (too many products). 4. So the reaction goes BACK, making more reactants until Q = K. _Source: syllabus Chem Ch 7 §7.5 Reaction Quotient_

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According to Brønsted-Lowry, an acid is a substance that:

  1. Accepts a proton
  2. Donates a proton
  3. Donates an electron pair
  4. Accepts an electron pair
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Correct answer: B. Donates a proton

1. Brønsted-Lowry: acid donates H⁺ (proton); base accepts H⁺. 2. (A) is the base definition; (C) is the Lewis base; (D) is the Lewis acid. 3. Example: in HCl + H₂O → Cl⁻ + H₃O⁺, HCl is the acid, H₂O is the base. _Source: syllabus Chem Ch 7 §7.10 Brønsted Acids and Bases_

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