Identify the wrong statements and correct them.
a. Sodium benzoate is used in food preservative
b. Nitric acid is not used as fertilizer in agriculture.
c. Sulphuric acid is called the king of chemicals.
d. The pH of acid is greater than 7.

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Solution

a. The statement is correct.
b. Nitric acid is used as fertilizer in agriculture.
c. The statement is correct.
d. The pH of acid is less than 7.

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Which of the following cannot be used as a food preservative ?

(a) sodium metabisulphite (b) sodium hydroxide (c) sodium benzoate (d) citric acid

Sodium salts of some acids are very useful as food preservatives. Suggest a few such acids.

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