Test Paper : CBSE Class X Self Evaluation Tests For Science :Acids, Bases and Salts
1. When sodium hydrogen carbonate is added to water, the hydrogen ion concentration decreases. What is the nature of the solution? Acidic or basic?
2 Write the chemical name and formula of bleaching powder.
3. A baker found that the cake prepared by him is hard and small in size? Which ingredient he has forgotten to add that would have caused the cake to rise and become light. Explain your answer.
4. When copper sulphate crystals are heated, a white powder is formed. Explain giving chemical equation.
5. A milkman adds a very small amount of baking soda to fresh milk.
1. When sodium hydrogen carbonate is added to water, the hydrogen ion concentration decreases. What is the nature of the solution? Acidic or basic?
2 Write the chemical name and formula of bleaching powder.
3. A baker found that the cake prepared by him is hard and small in size? Which ingredient he has forgotten to add that would have caused the cake to rise and become light. Explain your answer.
4. When copper sulphate crystals are heated, a white powder is formed. Explain giving chemical equation.
5. A milkman adds a very small amount of baking soda to fresh milk.
(a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline?
(b) Why does this milk take a long time to set as curd?
6. Explain the pH change as the cause of tooth decay. How can tooth decay caused by pH change be prevented?
7. Write the following reactions:
(i) Preparation of bleaching powder
(ii) Reaction between NaOH and Zn
(iii) Reaction between Potassium hydroxide and sulphuric acid.
8. With the help of a reaction, explain the manufacture of plaster of paris. What happens, if heating is not controlled during formation of plaster of paris?
9. Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction, if one of them compounds formed is calcium chloride.
10. What is universal indicator? What is the difference between universal indicator and olfactory indicator? Give examples of various types of indicators used to distinguish between acids and bases.
6. Explain the pH change as the cause of tooth decay. How can tooth decay caused by pH change be prevented?
7. Write the following reactions:
(i) Preparation of bleaching powder
(ii) Reaction between NaOH and Zn
(iii) Reaction between Potassium hydroxide and sulphuric acid.
8. With the help of a reaction, explain the manufacture of plaster of paris. What happens, if heating is not controlled during formation of plaster of paris?
9. Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction, if one of them compounds formed is calcium chloride.
10. What is universal indicator? What is the difference between universal indicator and olfactory indicator? Give examples of various types of indicators used to distinguish between acids and bases.
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