2006 WAEC Chemistry Practical (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)...

(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).

(d) Draw and label a diagram for a set-up that can be used for the separation of two immiscible liquids

(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

(d) Separating funnel is used to separate two immiscible liquids.

Open Photo

- Separating funnel

- Retort stand

- Mixture showing two layers

- Receiver

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