C6: ACID,BASE & SALT (F4)

Which of the following causes alkaline properties of aqueous ammonia solution?

• NH₃

• NH₄⁺

• OH^-

• H⁺

Which statement is CORRECT about an acid?

• Has bitter taste and feels slippery

• Acid solution cannot conduct electricity

• Acid solution contains only hydrogen ions

• Substance that ionises in water to produce hydrogen ions

Which substance is an alkali?

• zinc oxide

• magnesium oxide

• calcium hydroxide

• aluminium hydroxide

Which of the following pH values is for strong acid solution?

• pH 14

• pH 11

• pH 5

• pH 1

What is the pH value for 0.25 mol dm^-3 of strong acid solution?

• 0.5

• 0.6

• 0.7

• 0.8

Which of the following is TRUE about weak acid?

• unable to neutralise alkali

• pH value is more than 7

• able to change red litmus paper to blue

• ionises partially in water to produce hydrogen ions

Which of the following ionises partially in water?

• HNO₃

• HCl

• NaOH

• NH₃

What is the number of moles in 200 cm³ of 1.0 mol dm^-3 of hydrochloric acid?

• 0.002 mol

• 0.02 mol

• 0.2 mol

• 2.0 mol

What is meant by standard solution?

• a solution with large amount of solute in small amount of solvent

• a solution with small amount of solute in large amount of solvent

• a solution with a known concentration

• a solution with excess amount of solute

Shahid is stung by a bee. Which if the following substances is the MOST suitable to be applied to the affected area to treat Shahid?

• vinegar

• bicarbonate of soda

• cooking oil

• lemon