CHLORINE AND SULPHUR

A piece of filter paper moistened with lead (II) ethanoate solution turns black when the paper is dropped into a gas jar containing an unknown gas. The gas is likely to be

• Sulphur (IV) oxide
• Hydrogen chloride
• Sulphur (VI) oxide
• Hydrogen sulphide

Fluorine can exist in the oxidation states

• -1 only
• -1 and +1 only
• -1, +1 and +3 only
• -1,+1, +3, +5 and +7

Which of the following acts as both a reducing and an oxidizing agent?

• H₂
• SO₂
• H₂S
• Cl₂

The solubility of iodine in water is greatly increased by

• adding an acid
• boiling the solution
• cooling the solution
• adding potassium iodide

Which pair gives Cl₂ at room temperature?

• conc. HCl + KMnO₄
• NaCl + conc. H₂SO₄
• NaCl+ MnO₂
• NaCl + conc. NHO₃

Fluorine reacts with water to give

• hydrogen fluoride and oxygen
• hydrogen fluoride and ozone
• hydrogen fluoride and oxygen fluoride
• hydrogen fluoride, oxygen and ozone

Which of the following arrangements shows increasing order of reactivity of the halogens?

• F₂ > Cl₂> Br₂ > I₂
• I₂ < Br₂ < Cl₂ <. F₂
• F₂ < Cl₂ < Br₂ < I₂
• I₂ > Br₂ > Cl₂ > F₂

Halogens generally react with metals to form

• alkalis
• acids
• bases
• salts

The bleaching action of chlorine is through the process of

• hydrolysis
• hydration
• oxidation
• reduction

The impurities formed during the laboratory preparation of chlorine gas are removed by

• NH₃
• H₂O
• H₂SO₄
• HCI