Chemistry
Define the following terms:
(a) Electrolysis
(b) Non-electrolyte
(c) Cation and anion
(d) Weak electrolyte
Electrolysis
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Answer
(a) Electrolysis — It is the process of decomposition of a chemical compound in aqueous solution or in molten state accompanied by a chemical change using direct electric current.
(b) Non-electrolyte — It is a compound which neither in solution nor in the molten state allows an electric current to pass through it.
(c) Cation — Ions carrying positive charge are called cations.
Anion — Ions carrying negative charge are called anions.
(d) Weak electrolyte — Electrolytes which allow small amount of electricity to flow through them and are partially dissociated in aqueous solution are called weak electrolytes.
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Fill in the blanks:
(a) Powdered sodium chloride (common salt) does not conduct an electric current, but it does so when …………… or when …………… .
(b) Molten lead bromide conducts electricity. It is called an ……………. It is composed of lead …………… and bromide ……………. The lead ions are …………… charged and are called ……………. The bromide …………… are …………… charged and are called …………….
(c) Substances which conduct electricity in the solid state are generally …………….
(d) The electron releasing tendency of zinc is …………… than that of copper.
(e) A solution of HCl gas in water conducts electricity because ……………, but a solution of HCl gas in toluene does not conduct an electric current because …………….
(f) Pure water consists entirely of …………… (ions/molecules).
(g) We can expect that pure water …………… (will/will not) normally conduct electricity.
(h) Electrolysis is the passage of ……………. (electricity/electrons) through a liquid or a solution accompanied by a ……………. (physical/chemical) change.
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