A piece of zinc metal was dipped into a beaker containing aqueous lead(II) nitrate. After a few minutes, a grey solid was formed.
a) i) Name the grey solid.
ii) Write an ionic equation to show the formation of the grey solid.
iii) If 0.02 moles of a grey solid was formed, what mass of zinc was dissolved?
b) Name another metal which can produce the same grey solid when added to aqueous lead(II) nitrate.
c) Describe what is observed when aqueous ammonia is added slowly to the resulting solution in the beaker.

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Solution

Zinc reacting with lead nitrate in a soft gel to form lead crystals. This is a displacement reaction. When a metal from the electrochemical series is mixed with the ions of a metal lower down in the series, the atoms of the more reactive metal push their electrons on to ions of the less reactive metal.
i. - zinc nitrate
$Z n + P b (N O_{3})_{2} \to P b + Z n (N O_{3})_{2}$
iii. - 0.02 moles
(b).- silver
(c).- NH3 is refers is to reaction

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X = C

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(A)	Colourless gas insoluble in $H_{2}$	Silver/grey solid, reacts with $H_{2} O$ to form an alkaline solution	Colourless gas form a strong acid in $H_{2} O$
(B)	Colourless liquid, no reaction with $H_{2} O$	Silver/grey solid, forms $H_{2} O$	Ionic solid with formula $Z H$
(C)	Colourless gas found naturally	Does not conduct electricity in the molten state	Colourless gas, reacts with $C l_{2}$
(D)	Non-polar compound reacts with $C l_{2}$ in light	Silver/grey ionic solid with formula $Y H_{2}$	Forms when water is added to phosphorus and element Z