Chemistry 11

Chemistry 11

All questions are compulsory.
Question number 1to 4 carry 1 mark each.
Question number 5 to 7 carry 2 marks each.
Question number 8 to 12 carry 3 marks each.
Question number13 and 14 are of 5 marks.
(R = 0.082 atm L mol- )
What type of equilibrium is described by Henry’s law?
What is the effect of catalyst on the equilibrium state in a chemical reaction?
Write the equilibrium constant expression for: CaCO3(s) ======CaO(s) + CO2(g).
Write conjugate acid and base of NH3.
Explain Arrhenius Concept of acids and bases with the help of example,
Calculate the hydronium ion and hydroxyl ion concentration in 0.01M solution of NaOH.
Calculate the value of Kc for the following equilibria from the value of Kp:
2NOCl (g) ======= 2NO (g) + Cl2 (g) Kp = 1.8 x 10-2 atm. at 500 K.
Articles of iron are generally coated with zinc.
Explain. Why?
Write the value for it.
(a)Define the term PH with expression.
(b)Calculate the pH of 10-10 M NaOH
(a) Explain Law of chemical equilibrium
(b)Calculate the concentration of CO2 which will be in equilibrium with 2.5 x 10-2 mol L-1
Of CO at 1000C for the reaction:
FeO(s) + CO(g) ======= Fe (s) + CO2 (g) Kc = 5.0
11 ( i) Differentiate Between EMF and cell potential.( give two main points).
(ii) What is the oxidation number of Sulphur in H2 S4 O6.
12 Predict the products of electrolysis of an aqueous solution of H2SO4 by using
platinum electrodes, Explain with the help of cell reactions.

(a) Why is standard hydrogen electrode called reversible electrode?
(b)Identify the oxidant and reductant in the following redox reaction. Give reason also..

2K2MnO4 + Cl2 -------à 2KCl + 2KMnO4
(c)Define disproportionation reaction with the help of reaction.

14. Balance the following equations:
(a) P + HNO3 ------------à HPO3 + NO + H2O
(b) MnO4- + Fe 2+ ------à Mn2+ + Fe3+ + H2O(Acidic medium)
Bonus Question


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