Qualitative Analysis

NaOH is added to an unknown solution. A blue ppt forms. The formula of the ion is:

• Fe
• Fe3+
• Fe2+
• Cu2+

NaOH is added to an unknown solution. A orange-brown ppt forms. The formula of the ion is:

• Fe2+
• Fe3+
• Cu2+
• Cl-

NaOH is added to an unknown solution. A green ppt forms. The formula of the ion is:

• Fe2+
• Fe3+
• Cu2+
• Na+

NaOH is added to an unknown solution. A strong smell is given off. The formula of the ion is:

• Cl-
• Br2
• NH4+
• I-

Anyhdrous copper sulphate is added to water. The colour change is from:

• White-Blue
• Pink-Blue
• Blue-Pink
• Blue-White

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

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

How do you test for carbon dioxide gas?

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

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

When we test for Nitrate, which gas is evolved ?

• Nitrogen Dioxide
• Ammonia
• Ammonium
• Nitrogen trioxide