Which of the following solution of acetic acid in water can be used as preservative.
A) 5 -10 %
B) 10 -15 %
C) 15 – 20 %
D) 100 %
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Ethanol i) Acetic acid , thanoic acid ii) Acetaldehyde
D) a → iv, b → i, c → ii, d → iii
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Which of the four tubes containing following chemicals show the brisk effervescence when dilute acetic acid is added to them ?
Correct option is B) ii & iii
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If 2 ml of acetic acid is added slowly in drops to 5 ml of water then we will notice
C) formation of clear and homogeneous solution
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The conversion of malic acid to oxalo acetic acid is catalyzed by
The correct answer is (D) malate dehydrogenase
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Which one of the following is a natural preservative obtained from animals?
The correct answer is C) Honey
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Which of the following preservative is harmful to health?
The correct answer is A) Benzoate
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Which of the following preservative is harmful to health?
2 Answers
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The very common preservative method for vegetables and fruits is …………………
The very common preservative method for vegetables and fruits is Freezing
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The very common preservative method for vegetables and fruits is …………………
2 Answers
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1. (a) Is ammonia more dense or less dense than air? (b) What property of ammonia is demonstrated by the Fountain Experiment? (c) Write the balanced equation for the reaction between ammonia and sulphuric acid. 2. Pick the odd member from the list giving reasons: (a) Ammonia, sulphur dioxide, hydrogen chloride, carbon dioxide. (b) Copper oxide, aluminium oxide, sodium oxide, magnesium oxide. 3. Give reasons for the following : (a) Liquid ammonia is used as a refrigerant in ice plants. (b) Aqueous solution of ammonia is used for removing grease stains from woollen clothes. (c) Aqueous solution of ammonia gives a pungent smell. (d) Aqueous solution of ammonia conducts electricity.
(1) (a) ammonia is less dense than air (b) solubility in water (c) 2NH3 + H2SO4 → (NH4)2SO4 (2) (a) Ammonia → because - NH3 is basic while, SO2,HCl and CO2 are acidic oxides. (b) CuO,...
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