(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 bl...
Question 1 Report
(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 bas.c 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
Answer Details
(a)
- The black compound is manganese(IV) oxide, MnO2.
- The basic oxide is MnO2.
- The compound that sublimes on heating is ammonium chloride, NH4Cl.
- The compounds that dissolve in water to give a solution with pH less than 7 are NH4Cl and Pb(NO3)2.
(b)
- Calcium hydroxide solution: colourless.
- Iron(III) trioxonitrate(V) solution: yellow or brownish-yellow.
- Copper(II) tetraoxosulphate(VI) solution: blue.
- Potassium heptaoxodichromate(VI) solution: orange.
(c) Water, H2O, is a neutral oxide which is a colourless liquid at room temperature.
(d) Separation of two immiscible liquids
A separating funnel is clamped to a retort stand. The denser liquid forms the lower layer and is run off first through the stopcock into a receiver.
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