Which acid causes the sourness of green apples?

citric acid

malic acid

lactic acid

formic acid

Malic acid is more sour than citric acid, and is the source of extreme tartness in so-called extreme candy. Malic acid occurs naturally in all fruits and many vegetables.

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Answers by country

Poland

25%

56%

25117

Germany

24%

52%

13%

105

India

34%

49%

975

the Netherlands

31%

44%

13%

10%

New Zealand

42%

France

32%

40%

12%

16%

Republic of Ireland

37%

13%

10%

South Africa

47%

36%

13%

Nigeria

28%

35%

20%

13%

123

Pakistan

48%

35%

10%

110

Australia

50%

34%

10%

130

Unknown

40%

34%

14%

12%

the United States

48%

32%

903

the United Kingdom

51%

30%

515

the United Arab Emirates

50%

29%

Canada

55%

28%

Malaysia

56%

28%

Singapore

68%

22%

the Philippines

55%

21%

11%

Indonesia

46%

19%

30%

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What is the effect of nicotinic acid on human organism?

it is neutral

It is harmful, causes cancer

It is highly toxic, kills in 10 seconds

It is essential for functioning

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