THE EDUTECH
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Short Answer Type Question[l] [2 Marks] – The year 2014
1.Identify the natural source of each of the following acid
(1) Citric acid. (2)Oxalic acid.
(3)Lactic acid. (4)Tartaric acid.
Answer.
(1) Lemon and orange. (2)Tomatoes and Guava.
(3)Sour milk (curd). (4)Tamarind.
Short Answer Type Question[l] [2 Marks] – The year 2013
2.A student detected the pH of four unknown solutions and these solutions are named as A, B, C, and D as follows 11, 5, 7, and 2. Predict the nature of the solution.
Answer. A is basic ‘B’ is acidic ‘C’ is natural and ‘D’ is strongly acidic.
Short Answer Type Question[ll] [3 Marks] – The year 2013
3. (1) Give the constituents of baking powder
(2) Why cake or bread swells on adding baking powder? Write the chemical equation.
Answer.
(1) Baking powder containing sodium hydrogen carbonate and tartaric acid.
(2)It is due to carbon dioxide
Long Answer Type Question [5 Marks] – The year 2013
4.Equal length of magnesium ribbons are taken in two test tubes ‘A’ and ‘B\ H2SO4 is added to test tube ‘A’ and H2CO3 in the test tube ‘B’ in equal amounts:
(1) Identify the test tube showing a vigorous reaction.
(2) Give reason to support your answer.
(3) Name the gas liberated in both tubes. How will you prove its liberation?
(4) Write chemical equations for both reactions.
(5) Out of the two acids taken above
(6) which one will have a lower pH value.
(7) lowerH+ concentration respectively.
Answer.
(1) A will show a vigorous reaction.
(2) It is because H2SO4 is a strong acid.
(3) Hydrogen gas will be formed. Bring a burning splinter near the gas. It will burn with a ‘pop’ sound. It shows gas liberated is hydrogen.
