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Case Study Questions for Class 11 Chemistry Chapter 7 Equilibrium
Case Study Questions
Question 1:
Read the passage given below and answer the following questions.
Reactants and products coexist at equilibrium, so that the conversion of reactant to products is always less than 100%. Equilibrium reaction may involve the decomposition of a covalent (nonpolar) reactant or ionization of ionic compound into their ions in polar solvents. Ostwald dilution law is the application of the law of mass action to the weak electrolytes in solution.
A binary electrolyte AB which dissociates into A+ and B– ions i.e.
for every weak electrolyte, Since α <<1 (1 – α) = 1
(i) A monobasic weak acid solution has a molarity of 0.005 M and pH of 5. What is its percentage ionization in this solution?
(a) 2.0
(b) 0.2
(c) 0.5
(d) 0.25
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Answer: b(ii) Calculate ionisation constant for pyridinium hydrogen chloride. (Given that H+ ion concentration is 3.6 × 10–4 M and its concentration is 0.02 M.)
(a) 6.48 × 10–2
(b) 6 × 10–6
(c) 1.5 × 10–9
(d) 12 × 10–8
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Answer: c(iii) The hydrogen ion concentration of a 10–8 M HCl aqueous solution at 298 K (Kw = 10–14) is
(a) 9.525 × 10–8 M
(b) 1.0 × 10–8 M
(c) 1.0 × 10–6 M
(d) 1.0525 × 10–7 M
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Answer: d(iv) Ostwald dilution law is applicable to
(a) weak electrolytes
(b) non-electrolyte
(c) strong electrolyte
(d) all type of electrolyte.
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Answer: a(v) If a is the fraction of HI dissociated at equilibrium in the reaction: 2HI ⇔ H2 + I2
then starting with 2 mol of HI, the total number of moles of reactants and products at equilibrium are
(a) 1
(b) 2
(c) 1 + α
(d) 2 + 2α
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Answer: bRelated Posts
Class 11 Chemistry Case Study Questions
Chapter 1 Some Basic Concepts of Chemistry Case Study Questions
Chapter 2 Structure of The Atom Case Study Questions
Chapter 3 Classification of Elements and Periodicity in Properties Case Study Questions
Chapter 4 Chemical Bonding and Molecular Structure Case Study Questions
Chapter 5 States of Matter Case Study Questions
Chapter 6 Thermodynamics Case Study Questions
Chapter 7 Equilibrium Case Study Questions
Chapter 8 Redox Reactions Case Study Questions
Chapter 9 Hydrogen Case Study Questions
Chapter 10 The s-Block Elements Case Study Questions
Chapter 11 The p-Block Elements Case Study Questions
Chapter 12 Organic Chemistry: Some Basic Principles and Techniques Case Study Questions
Chapter 13 Hydrocarbons Case Study Questions
Chapter 14 Environmental Chemistry Case Study Questions
