Qualitative Analysis

Which cations are responsible for the yellow, red and apple-green colors produced in a flame test?

• lithium, calcium, barium

• sodium, potassium, copper

• sodium, calcium, copper

• sodium, calcium, barium

Dilute sodium hydroxide is added to the solution of an unknown ion. The mixture is warmed to produce a gas that turns red litmus paper blue. What is the unknown ion?

• Ammonia

• ammonium

• carbonate

• nitrate

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

When ammonium hydroxide solution is added to an unknown solution a green precipitate is fomed. Which ion is present?

• Cu 2+

• Fe 3+

• Fe 2+

• Zn 2+

Tags

NGSS.HS-PS1-1

Which compound forms a colored aqueous solution?

• calcium chloride

• Chromium chloride

• sodium hydroxide

• Potassium bromide

which of the following ions will produce white precipitate and soluble in excess aqueous sodium hydroxide solution?

• Mg²⁺

• Ca²⁺

• Fe³⁺

• Al³⁺

What is the chemical formula for the cations that may be present in the salt?

• A

• B

• C

• D

What type of reaction produced an insoluble salt?

• Neutralisation reaction

• Precipitation reaction

• Titration reaction

• Insoluble reaction

Which of the following is insoluble?

• silver chloride

• zinc chloride

• potassium chloride

• ammonium chloride

In qualitative analysis, coding scheme often occurs while data are being collected.

• True

• False

A few drops of NaOH (aq) was added to the colourless solution. A white ppt was observed. What cations could be present in the original colourless solution?

• Zn²⁺

• NH₄⁺

• Al³⁺

• Cu²⁺

• Ca²⁺

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2