Testing for Cations and Anions

In flame testing, what element is indicated by an yellow flame?

• Carbon

• Sodium

• Copper

• Lithium

When doing a flame test, what element is indicated by a purple/lilac flame?

• Barium

• Calcium

• Potassium

• Copper

Which ion can be detected in solution by adding dilute sodium hydroxide and then warming, before testing the gas given off with damp red litmus paper? A blue colour is a positive result.

• Ammonium

• Chloride

• Sulfate

• Carbonate

Many ions can be detected in solution by adding another solution and observing the colour of the solid formed. What term is given to a solid formed in a reaction between two solutions?

• Filtrate

• Precipitate

• Residue

• Solution

What solution is added to test for the presence of transition metal ions in solution?

• Hydrochloric acid

• Barium nitrate

• Silver nitrate

• Sodium hydroxide

What is the colour of the solid hydroxide formed when testing for copper(II) ions?

• Blue

• Green

• Orange

• Brown

A solution contains some metal ions. Sodium hydroxide is added and a brown solid forms. What ion is most likely to be present?

• Zn²⁺

• Fe²⁺

• Fe³⁺

• Ba²⁺

Tags

NGSS.HS-PS1-1

Dilute hydrochloric acid is added to a colourless solution. Bubbles appear immediately and this gas turns limewater cloudy. What ion was present in the solution?

• Carbonate

• Sulfate

• Nitrate

• Chloride

A mystery colourless solution has some dilute hydrochloric acid added and nothing happens. Then, some barium chloride is added and a white solid forms. What ion is present?

• Ammonium

• Chloride

• Sulfate

• Nitrate

A mystery solution contains a sodium halide. Dilute nitric acid is added, and then some silver nitrate solution. A cream precipitate is forme, which dissolves in dilute ammonia solution. What halide ion is present?

• Fluoride

• Chloride

• Bromide

• Iodide