Equilibrium - Online Test
Q1.
The ionization constant of an acid, , is the measure of strength of an acid. The Ka values of acetic acid, hypochlorous acid and formic acid are respectively. Which of the following orders of pH of 0.1 mol dm-3 solutions of these acids is correct?
Answer : Option B
Explaination / Solution:
pH=-log(cα) , Ka= . Lesser is the pH value greater is acidity. Also greater is Ka, lesser will be acidity.
Q2. and are the respective ionisation constants for the following reactions.
The correct relationship between and is
The correct relationship between and is
Answer : Option B
Explaination / Solution:
Equation (3) =(1) + (2) So = ×
Q3. Acidity of can be explained on the basis of which of the following concepts?
Answer : Option D
Explaination / Solution:
Acidity of is explained on the basis of Lewis concept because Boron have vacant p-orbital.
Q4. In which of the following solvents is silver chloride most soluble?
Answer : Option A
Explaination / Solution:
AgCl is soluble in ammonia due to the formation of complex
Q5. What will be the value of pH of
Answer : Option D
Explaination / Solution:
pH= -log(cα) And Ka=
Q6. The pH of ammonium acetate will be
Answer : Option A
Explaination / Solution:
is a salt of weak acid and weak base. pH= 7+ 0.5(pKa-pKb) pKa=-log(Ka) and pKb=-log(Kb) Here pKa=pKb so pH=7.
Q7. Which of the following options will be correct for the stage of half completion of the reaction A ⇌B.
Answer : Option C
Explaination / Solution:
Equilibrium will be established so = 0
Q8.
On increasing the pressure, in which direction will the gas phase reaction proceed to re-establish equilibrium is predicted by applying the Le Chatelier’s principle. Consider the reaction. (g) Which of the following is correct, if the total pressure at which the equilibrium is established, is increased without changing the temperature?
Answer : Option D
Explaination / Solution:
is independent of P change ,only the position at which equilibrium will be established will differ.
Q9.
What will be the correct order of vapour pressure of water, acetone and ether At . Given that among these compounds, water has maximum boiling point and ether has minimum boiling point?
Answer : Option A
Explaination / Solution:
Water has maximum boiling point due to hydrogen bonding so its vapour pressure will be least because of low boiling point less amount of water will move to vapour phase at a particulat temperature so lesser will be the vapour pressure.
Q10. At 500 K, equilibrium constant, , for the following reaction is 5.2. HI (g) What would be the equilibrium constant Kc for the reaction 2HI (g)
Answer : Option B
Explaination / Solution:
The second equation can be obtained by reversing the 1st reaction and multiplying by 2. So Here ,=5.2
