QQuestion
Complete the following sentences by choosing the correct word(s) from the brackets:
(a) …………… solution forms a coloured precipitate with ammonium hydroxide which is soluble in excess of ammonium hydroxide. [Ferrous chloride / Copper nitrate]
(b) Zinc blende is converted to zinc oxide by ……………. [Calcination / Roasting]
(c) …………… conducts electricity by the movement of ions. [Molten iron / Molten sodium chloride]
(d) The reaction that takes place at the anode during the electrolysis of aqueous Sodium argentocyanide with silver electrodes is ……………. [Ag ⟶ Ag+ + e–/ Ag+ + e– ⟶ Ag]
(e) The salt formed when ZnO reacts with hot concentrated NaOH is …………… . [sodium zincate / zinc hydroxide]
✓Answer
(a) Copper nitrate solution forms a coloured precipitate with ammonium hydroxide which is soluble in excess of ammonium hydroxide.
(b) Zinc blende is converted to zinc oxide by roasting.
(c) Molten sodium chloride conducts electricity by the movement of ions.
(d) The reaction that takes place at the anode during the electrolysis of aqueous Sodium argentocyanide with silver electrodes is Ag ⟶ Ag+ + e–
(e) The salt formed when ZnO reacts with hot concentrated NaOH is sodium zincate.
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