CHEMISTRY'S QUIZ

What is mean by STRONG ACID?

• Chemical substance that ionises partially in water to produce a low concentration of hydroxide ion

• Chemical substances that ionises completely in water to produce a high concentration of hydrogen ions

• Chemical substance that ionises completely in water to produce a high concentration of hydroxide ions

• Chemical substance that ionises partially in water to produce a low concentration of hydrogen ions

Diagram 1 shows two solutions of the same concentration and their pH values.

The difference in the pH values is because

• The concentration of hydroxide ions in R is greater than in S

• The number of moles of hydroxide ions in S is less than in R

• R ionises partially whereas S ionises completely

• The degree of ionisation of R is higher than S

Which of the following substances will dissociate to form low concentration of hydrogen ions in water?

I. Ethanoic acid

II. Carbonic acid

III. Nitric acid

IV. Hydrochloric acid

• I and II

• I and III

• II and IV

• III and IV

Which of the following best describes the statement above?

• Ethanoic acid is a monoprotic acid while hydrochloric acid is a diprotic acid

• Ethanoic acid is a strong acid while hydrochloric acid is a weak acid

• Ethanoic acid is partially ionised while hydrochloric acid is completely ionised in water

• Ethanoic acid in ionic form while hydrochloric acid in molecular form

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 acid to produce salt and water

Diagram above shows the apparatus set-up for a reaction between an acid and metal Y.

Which of the following is NOT metal Y?

• Calcium

• Argentum

• Magnesium

• Aluminium

State whether the following statement is true or false

"Ethanoic acid in vinegar causes a strong smell and a sour taste"

• True

• False

What you can observe when dilute sulphuric acid reacts with aluminium metal?

• Colourless bubble gas is released (hydrogen gas)

• Lime water turns cloudy

• Blue colour of solution is formed