Qualitative Analysis

Qualitative Analysis

Prepared by N. Kerr-Walker

Poll

Do you know the colour of precipitates and their solubilities?

• Yes, I have my study cards with colours and solubilities

• Yes, I study from a table

• I know some but need more practice

• No, I just can't seem to remember

Poll

Do you know colour of gases and the tests for them?

• Yes, I remember the gas tests

• Kinda, need to study them

• No, what tests?

Poll

Do you know how to prepare gases?

• Yes

• No

Poll

I know the reagents to test for anions, the colour of their precipitates and their solubilities.

• I know the reagents, precipitate colours and solubilities

• I know some precipitate colours and solubilities

• I do not know anything

Preparation of Gases

Visit: https://www.youtube.com/watch?v=grsrnXgpH7M

Multiple Choice

Which two reagents are required for Metals Cation testing?

• NaOH, HCl

• NH₄OH, NH₃

• NH₄OH, HNO₃

• NaOH , NH3

Multiple Choice

How do you test for Chlorine gas?

• Bleaches damp litmus paper
• Makes a squeaky pop with a lit splint
• Relights a glowing splint
• Turns limewater milky

Multiple Choice

How do you test for oxygen gas?

• Makes a squeaky pop with a lit splint
• Relights a glowing splint
• Bleaches damp litmus paper
• Turns limewater milky

Multiple Choice

How do you test for hydrogen gas?

• Relight a glowing splint
• Makes a squeaky pop with a lit splint
• Turns limewater milky
• Bleaches damp limtus paper

Multiple Choice

How can aluminium sulphate and zinc sulphate solution be differentiated?

• Addition of silver nitrate solution
• Addition of aqueous ammonia
• Addition of sodium hydroxide solution
• Addition of barium chloride solution

Multiple Choice

A solution X when added into sodium carbonate solution turns limewater cloudy. which of the following is solution X?

• Aqueous ammonia solution
• Calcium hydroxide solution
• Vinegar
• Magnesium nitrate solution

Multiple Choice

Which cation gives a brick red precipitate with NaOH?

• Fe⁺²

• Al⁺³

• Ca⁺²

• Cu⁺²

• Fe⁺³

Multiple Choice

Aluminium sulfate is used in water treatment. Aqueous aluminium sulfate is acidic. The options shows the pH and cation test using excess aqueous ammonia on four different samples of treated water. To which sample had an excess of aluminium sulfate been added?

• 3, white precipitate

• 3, no visible change

• 7, no visible change

• 11, white precipitate

Multiple Choice

A pale green solution X gives a green precipitate with excess aqueous sodium hydroxide. An alkaline gas is only given off when the mixture is warmed with aluminium powder. What ions foes X contain?

• Ammonium and copper(II)

• Ammonium and iron(II)

• Nitrate and copper(II)

• Iron(II) and nitrate

Multiple Choice

After acidification with dilute nitric acid, a colourless solution of X reacts with aqueous silver nitrate to give a white precipitate. What could X be?

• Calcium iodide

• Copper(II) chloride

• Lead(II) iodide

• Sodium chloride

Multiple Choice

Aqueous sodium hydroxide reacts with a metal ion producing a coloured precipitate. This precipitate changes colour on standing. What is the ion present?

• Al3+

• Cu2+

• Fe2+

• Fe3+

Multiple Choice

A metallic ion in aqueous solution produces

(i) white precipitate with aqueous sodium hydroxide, soluble in excess to produce a colourless solution.

(ii) white precipitate with aqueous sodium hydroxide, soluble in excess to produce a colourless solution.

What is the metallic ion?

• Al3+

• Ca2+

• K+

• Zn2+

Multiple Choice

Which ion, in aqueous solution, forms a white precipitate when dilute sulfuric acid is added?

• Ag+

• Ba2+

• Cu2+

• Fe2+

Multiple Choice

In both experiments, a precipitate was obtained which dissolved in an excess of the added reagent. What could X contain?

• Copper (II) nitrate

• Iron(II) nitrate

• Iron(III) nitrate

• Zinc nitrate

Multiple Choice

Which gas changes damp litmus paper from red to blue?

• Ammonia

• Carbon dioxide

• Chlorine

• Hydrogen

Multiple Choice

What gas is formed when ammonium chloride is warmed with aqueous sodium hydroxide?

• Ammonia

• Chlorine

• Oxygen

• Hydrogen

Multiple Choice

A solid is insoluble in water but dissolves in aqueous alkali without evolution of a gas. What could the solid be?

• Copper (II) carbonate

• Copper(II) hydroxide

• Zinc carbonate

• Zinc hydroxide

Practice Past Papers

References

https://www.onlinemathlearning.com/

chemical-analysis.html