QUALITATIVE ANALYSIS

To test for ........................., an effervescence which turns red litmus paper to blue evolves.

• hydrogen gas

• ammonia gas

• oxygen gas

• chlorine gas

The followings are anions, EXCEPT .....................

• NO3-

• CO32-

• O2-

• Ca2+

To tes for carbonates, ........................... is liberated

• Carbon III oxide

• Carbon II oxide

• Carbon I oxide

• Carbon IV oxide

The following are reagents useful to test anions EXCEPT ......................

• Barium Chloride

• Sodium Hydroxide

• Trioxonitraate V acid

• Hydrochloric acid

The following statements are true of Carbon IV oxide

I. It turns damp blue litmus paper red.

II. It turns lime water milky.

III. The milkiness disappears in excess of CO2

IV. Colourless and odourless

• I&II only

• I,II&III only

• I,II,III&IV

• I only

The following statements are true of Sulphur IV oxide

I. It turns damp blue litmus paper red.

II. It turns K2Cr2O7 acidified with dilute H2SO4 from orange to green.

III. It turns acidified KMnO4 from purple to colourless.

IV. It is colourless and odourless

• I, II&III Only

• I &II Only

• II &III Only

• IV Only

A portion of substance X with Sodium Hydroxide in drops may infer that ................... is NOT present with white precipitate formed

• Ca ion

• Zn ion

• Lead ion

• Iron II ion

A confirmatory test that gives a dissolution of precipitate in excess of aqeuos ammonia confirms ...................

• Aluminium ion

• Lead ion

• Calcium ion

• Zinc ion

A confirmatory test with a brown gelatinous precipitate on addition of Sodium Hydroxide in drops confirms the presence of ........................

• Iron III ions

• Iron II ions

• Copper II ions

• Copper III ions

An effervescence with a colourless gas with choking smell suggests ....................

• Hydrogen Sulphide

• Hydrogen Chloride

• Ammonia

• Ozone