C6: Acids, Bases & Salts (Part 3)

Which of the following is TRUE about the chemical properties of alkali?

• react with metal carbonates to produce salt, water and carbon dioxide

• react with reactive metals to produce salt and hydrogen gas

• react with metal oxides to produce salt and water

• react with acids to produce salt and water

What is the number of moles in 0.3 dm³ of 1.5 mol dm^-3 hydrochloric acid?

• 4.5 mol

• 0.45 mol

• 0.045 mol

• 0.0045 mol

What is the concentration of 0.5 mol dm^-3 sodium hydroxide solution in g dm^-3 unit?

[RAM: Na=23, O=16, H=1]

• 0.5

• 2.0

• 20.0

• 40.0

Excess zinc powder is added to 25 cm³ of 0.1 mol dm^-3 copper(II) sulphate solution. What is the mass of copper produced?

[RAM: Cu=64]

• 0.16 g

• 6.4 g

• 64 g

• 160 g

Which of the following solutions give the lowest pH value?

• 1.0 mol dm^-3 sulphuric acid

• 1.0 mol dm^-3 ethanoic acid

• 1.0 mol dm^-3 ammonia solution

• 1.0 mol dm^-3 sodium hydroxide solution

The following are steps in the preparation of a standard solution through dilution method. Choose the CORRECT sequence of the steps.

• P,Q,R,S

• P,R,Q,S

• P,R,S,Q

• R,S,P,Q

Which of the following substances can be used to neutralise wasp stings?

• carbon

• vinegar

• toothpaste

• sodium bicarbonate

What is the mass of sodium nitrate needed to be dissolved in water to produce 250 cm³ of 0.1 mol dm^-3 sodium nitrate solution?

[RAM: Na=23; N=14]

• 0.025 g

• 1.325 g

• 2.125 g

• 2.300 g