Cation Lab CHM129

Which cation in this experiment reacts with K₄Fe(CN)₆ solution to give Prussian blue precipitate of KFe[Fe(CN)₆] ?

• Fe³⁺

• ^K+

• Fe²⁺

• As³⁺

In the Al³⁺ ion test with Aluminon solution under the

base condition, what was the result of the experiment?

• Blue gelatinous

• Red gelatinous

• White gelatinous

• Reddish brown gelatinous

When the PbCl₂ precipitate was dissolved in hot water and then react with K₂CrO₄ solution, which result will be the following experiment?

• Yellow precipitate

• Yellow solution

• White precipitate

• Colorless solution

What kind of cations that reacts with 6.0 M NaOH in hot water to form a gaseous product which can be tested with moist red litmus paper?

• Mg²⁺

• NH₄⁺

• Na⁺

• Cd²⁺

In the testing of Cd²⁺ ion with Thioacetamide solution in acidic conditions and heated in water, what will be the result of the experiment?

• Black precipitate

• Orange precipitate

• Yellow precipitate

• White precipitate

From this experiment, which group of cations was used to determine the color of the flame by burning a solution of cations in a concentrated HCl acid with platinum wire?

• Calcium group

• Silver group

• Copper group

• Zinc group

From ion testing with Flame test method, which ion in this experiment gives yellow flame ?

• K⁺

• Na⁺

• Ba²⁺

• Ca²⁺

From ion testing with Flame test method, which ion in this experiment gives blood red flame ?

• Ba²⁺

• Na⁺

• Sr²⁺

• Ca²⁺

Which cation in this experiment reacts with NH₄OH solution and produces a reddish-brown gelatinous precipitate.

• Fe³⁺

• K⁺

• Al³⁺

• As³⁺

Which compound is the white precipitate?

• PbCl₂

• As₂S₃

• Fe(OH)₃

• Fe(SCN)₃