March 08, 2012

Electrochemistry – I One Mark Questions

1. Equivalent conductance of acetic acid at 25°C is 80 ohm–1 cm2 (gram equivalent)-1 and at infinite dilution is 400 ohm–1cm2 (gram equivalent)–1. The degree of dissociation is
a) 1                        b) 0.2                           c) 0.1                           d) 0.3.
2. Faraday's laws of electrolysis are related to
a) atomic number of the cation                 b) atomic number of the anion
c) equivalent weight of the electrolyte     d) speed of the cation.
3. For the titration between oxalic acid and sodium hydroxide, the indicator used is / The indicator suitable for the titration of oxalic acid against NaOH is
a) potassium permanganate                       b) phenolphthalein
c) litmus                                                    d) methyl orange.
4. If 0.2 ampere can deposit 0.1978 g of copper in 50 minutes, how much of copper will be deposited by 600 coulombs?
a) 19.78 g              b) 1.978 g                    c) 0.1978 g                  d) 197.8 g
5. Ostwald’s dilution law is applicable in the case / to the solution of
a) CH3COOH       b) NaCl                       c) NaOH                     d) H2SO4
6. The Indicator used in the titration of ammonium hydroxide with hydrochloric acid is
a) KMnO4             b) Methyl orange         c) Phenolphthalein      d) Litmus.
7. The pH of a solution containing 0.1N NaOH solution is
a) 1                        b) 10–1                                     c) 13                            d) 10-13.
8. When 10–6 mole of a monobasic strong acid is dissolved in one litre of solvent, the pH of the solution is
a) 6                        b) 7                              c) 4                              d) less than 7
9. When one coulomb of electricity is passed through an electrolytic solution, the mass deposited on the electrode is equal to
a) equivalent weight                                  b) molecular weight
c) electrochemical equivalent                    d) one gram.
10. When pH of a solution is 2, the hydrogen ion concentration in moles litre-l is
a) 1 x 10–12            b) 1 x 10-4                    c) 1 x 10-7                    d) 1 x 10–2
11. When sodium acetate is added to (a solution of) acetic acid, the degree of ionisation of acetic acid
a) increases                                                b) decreases
c) does not change                                    d) becomes unity / becomes zero.

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