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16 questions
Why can't you use a flame test to distinguish between silver and lead?
silver is colourless
lead is toxic
they are the same colour
both 1 & 2 are correct
A white precipitate forming when ammonia is added to an unknown light blue precipitate indicates the presence of....
copper
magnesium
barium
silver
A cobalt blue precipitate forming when ammonia is added to an unknown light blue precipitate indicates the presence of....
silver
lead
magnesium
copper
Ammonia can be added to a light blue precipitate to distinguish between....
magnesium & silver
magnesium & copper
copper & silver
silver & lead
A light blue precipitate formed when sodium hydroxide is added to an unknown solution indicates the presence of.....
barium
calcium
copper
iron(II)
A green precipitate formed when sodium hydroxide is added to an unknown solution indicates the presence of.....
iron(III)
calcium
copper
iron(II)
An orange-brown precipitate formed when sodium hydroxide is added to an unknown solution indicates the presence of.....
iron(III)
calcium
copper
iron(II)
Dilute sodium hydroxide can be added to an unknown solution to indicate the presence of....
iron(II)
iron(III)
copper
all of the above
Potassium thiocyanate added to an orange-brown precipitate will form a blood red precipitate if which ion is present?
iron(II)
barium
lead
iron(III)
Sodium fluoride added to a sample will form a white precipitate if which ion is present?
calcium
barium
silver
lead
Which metal produces an apple green flame?
barium
calcium
silver
lead
Which metal produces a brick red flame?
barium
calcium
silver
lead
Sulfuric acid can be added to an unknown solution to indicate whether which ions are present?
barium
calcium
barium & calcium
lead & silver
A yellow precipitate will form when potassium dichromate is added to a precipitate sample containing....
silver
lead(II)
barium
calcium
A red precipitate will form when potassium dichromate is added to a precipitate sample containing....
silver
lead(II)
barium
calcium
A precipitate forming when HCl is added to an unknown solution indicates the presence of which ions?
barium & calcium
iron(II) & iron(III)
copper & magnesium
lead & silver
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