Section 3.5,3.6 SBQ

Salt X is added to sodium hydroxide solution and the mixture is heated. The gas evolved turns moist red litmus paper blue. What ion is present in salt X?

• Nitrate ion

• Ammonium ion

• Sulfate ion

• Carbonate ion

What reagent can be used to differentiate hydrochloric acid and sulfuric acid?

• Calcium chloride solution

• Sodium hydroxide solution

• Ammonia solution

• Silver nitrate solution

The best test for oxygen is that?

• it relights a glowing splint

• turns lime water milky

• burns with a squeaky pop sound with a lighted splint

• turns damp blue litmus red

In winters, a variety of chemical salts are added to the ice on sidewalks and roads to melt it. Which colligative property is involved in the process?

• Lowering the boiling point

• Raising the freezing point

• Lowering the freezing point

• Raising the boiling point

Colligative properties depend on?

• Size of the particles

• Type of particles

• Shape of particles

• Amount of particles

What is the freezing point of a solution of 0.5 mol of LiBr in 500 g of water? (K = 1.86C/m)

• –1.86C

• –3.72C

• –5.58C

• –7.44C

Which of the following is a colligative property of a solution?

• melting point elevation

• vapor pressure increases

• freezing point increases

• boiling point elevation

Which of the following solutions have the greatest effect on the freezing point of water?

• 1.0 m C₁₂H₂₂O₁₁

• 1.0 m Na₃PO₄

• 1.0 m CaCl₂

• 1.0 m KCl

Aluminium cation could be tested by

• A yellow precipitate will be formed by adding ammonia solution

• A green precipitate will be formed by adding ammonia solution

• Awhite gelatinous precipitate will be formed by adding ammonia solution

• Reddish brown precipitate will be formed by adding ammonia solution

When a flame test performed, the flame becomes -------- in the presence of copper

• Lilac

• Yellow

• Red

• Green