TEST3
Click on the correct answer
1
1st statement: Yeasts cannot survive in the absence of oxygen.
2nd statement: Yeasts are fungi.
Both statements are true but the 2nd one is not a correct explanation of the 1st one.
Only one statement is true while the other is false.
Both statements are true and the 2nd one is a correct explanation of the 1st one.
Both statements are false.
2
1st statement: Benzoic acid is a preservative commonly used in fruit juice.
2nd statement: Benzoic acid is a weak organic acid.
Both statements are true but the 2nd one is not a correct explanation of the 1st one.
Only one statement is true while the other is false.
Both statements are true and the 2nd one is a correct explanation of the 1st one.
Both statements are false.
3
1st statement : Vinegar is used as a preservative for cucumbers.
2nd statement: The acid in the vinegar kills the bacteria and prevents the food from turning bad.
Both statements are true but the 2nd one is not a correct explanation of the 1st one.
Only one statement is true while the other is false.
Both statements are true and the 2nd one is a correct explanation of the 1st one.
Both statements are false.
4
1st statement : Sulphur dioxide is a food preservative.
2nd statement: Sulphur dioxide is a bleaching agent.
Both statements are true but the 2nd one is not a correct explanation of the 1st one.
Only one statement is true while the other is false.
Both statements are true and the 2nd one is a correct explanation of the 1st one.
Both statements are false.
5
Which of the following statements concerning the compound, CH
3
COOCH
2
CH
3
, is correct ?
It is a food preservative.
It has a pleasant smell.
Its systematic name is methyl ethanoate.
It is an electrolyte.
6
Which of the following statements concerning food additives is correct ?
A food additive with an E number of 102 can be used as a sweetener in candies.
Sodium benzoate can be used as a flavour enhancer in potato chips.
Sodium nitrite can be used to inhibit the growth of bacteria in bacon.
Synthetic esters can be used to enhance the appearance of fruit juice.
7
1st statement : Sugar can be used as a preservative for fruits.
2nd statement: Concentrated sugar solution inhibits the growth of microbes by drawing water out of them.
Both statements are true but the 2nd one is not a correct explanation of the 1st one.
Only one statement is true while the other is false.
Both statements are true and the 2nd one is a correct explanation of the 1st one.
Both statements are false.
8
The above diagram represents the results of a paper chromatography experiment. It can be concluded that the pigments present in mixture M are
P, R and T.
P, Q and T.
P, R and another unknown pigment.
P and two other unknown pigments.