Iron Tests: Flame Test, Sodium Hydroxide Test, and Tests for Negative Ions

The video tutorial demonstrates various tests to identify ions in compounds. It covers flame tests for positive ions, showing characteristic colors for metals like lithium, sodium, and copper. The sodium hydroxide test is explained, highlighting precipitate formation for different metal ions. Tests for negative ions, including carbonates, halides, and sulfates, are also detailed. The tutorial concludes with a practical application of these tests on an unknown substance, identifying it as sodium chloride.

What color does lithium emit during a flame test?

• Lilac

• Yellow

• Crimson

• Green

Which metal ion forms a blue precipitate with sodium hydroxide?

• Iron 2

• Copper 2

• Iron 3

• Aluminium

What happens to the white precipitate of aluminum when excess sodium hydroxide is added?

• It remains unchanged

• It dissolves

• It turns blue

• It turns green

Which test is used to identify carbonate ions?

• Flame test

• Sodium hydroxide test

• Silver nitrate test

• Acid reaction test

What color precipitate indicates the presence of bromide ions in the silver nitrate test?

• Cream

• Yellow

• Blue

• White

What is the result of adding barium chloride to a sulfate solution?

• Yellow precipitate

• White precipitate

• Blue precipitate

• No reaction

Which ions produce a yellow flame in the flame test?

• Sodium

• Potassium

• Copper

• Calcium

What is the purpose of the silver nitrate test?

• To detect halides

• To detect carbonates

• To detect sulfates

• To detect metals

What indicates the presence of sodium ions in the flame test?

• Crimson color

• Lilac color

• Green color

• Yellow color

What conclusion can be drawn if a white precipitate forms in the silver nitrate test?

• Presence of iodide ions

• Presence of bromide ions

• Presence of chloride ions

• Presence of sulfate ions