(a) Consider the following compounds: MnO\(_2\), NaHCO\(_3\), Na\(_2\)CO\(_3\), NH\(_4\)CI cnd Pb(NO\(_3\))\(_2\) Select the compound(s) which;
(i) has a black colour
(ii) is a basic oxide:
(ii) sublime on heating
(iv) dissolves in water to give a solution of pH less than 7.
(b) State the colour of each af the following aqueous Solutions:
(i) Calcium hydroxide;
(ii) iron (III) trioxonitrate (V):
(ii) Copper (II) tetraoxosulphate (VI);
(iv) Poassium heptaoxodichromate (VI).
(c) Give one example of a neutral oxide which is a colourless liquid at room temperature.
(d) Draw and label a diagram for a set-up that can be used for the separation of two immiscible liquids
Explanation
(a) Compound(s) which (i) has a black colour - NnO\(_2\)
(ii) is basic oxide - MnO\(_2\)
(iii) Sublime on heating - NH\(_4\)Cl
(iv) dissolves in water to give a solution of pH less than 7....NH\(_4\)Cl or Pb(NO\(_3\))\(_2\)
(b) The colour of each of the following aqueous solution are
(i) Calcium hydroxide - colourless
(ii) Iron (III) troxonitrate (V) - yellow or brownish yellow
(iii) Copper (II) tetraoxosulphate (VI) - blue
(iv) Potassium heptaoxodichromate (VI) - orange
(c) Neutral oxide which is colourless at room temperature is water (H\(_2\)O
(d) Separating funnel is used to separate two immiscible liquids.
- Separating funnel
- Retort stand
- Mixture showing two layers
- Receiver