Chemistry · Class 10 CBSE
A student accidentally spills dilute hydrochloric acid on the laboratory table. Which substance should be used to safely neutralise the acid?
A solution turns red litmus blue and phenolphthalein pink. Which statement is correct?
A farmer\'s field has highly acidic soil, reducing crop yield. Which substance is most suitable to improve the soil?
A student adds zinc granules to dilute hydrochloric acid and observes bubbles. Which gas is produced?
Two colourless solutions are mixed. No visible change occurs, but the pH becomes close to 7. Which type of reaction most likely took place?
A student wants to distinguish between hydrochloric acid and acetic acid using electrical conductivity. Which observation is correct?
Why should concentrated sulphuric acid be added slowly to water and not the other way around?
A student prepares sodium hydrogen carbonate by the Solvay process. Which everyday use is directly related to this compound?
A person suffers from acidity after eating spicy food. Which substance is commonly used as an antacid?
During electrolysis of brine, chlorine gas is produced. Which other useful product is obtained in this process?
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Why do acids show acidic properties only in aqueous solution and not in the absence of water?
2 marksA student tests three solutions using blue and red litmus paper. How can the student identify whether a solution is acidic, basic, or neutral?
2 marksWhy is pH important in maintaining healthy teeth? Explain.
2 marksExplain why farmers sometimes add lime to agricultural fields.
2 marksDifferentiate between bleaching powder and baking soda based on: - Chemical formula - One important use
2 marksExplain the preparation of washing soda from baking soda. Also mention: - Chemical formula of washing soda - Two important properties - Two everyday uses
5 marksDescribe the chlor-alkali process. In your answer, include: - Raw material used - Products obtained - Balanced chemical equation - One important use of each product
5 marksCase study: During a science practical, a student tested four colourless solutions. One solution turned blue litmus red, another turned red litmus blue, the third showed no change with either litmus paper, and the fourth reacted with zinc granules to produce bubbles. Answer the following questions: (a) Which solution is acidic? How can you identify it?
1 markCase study: During a science practical, a student tested four colourless solutions. One solution turned blue litmus red, another turned red litmus blue, the third showed no change with either litmus paper, and the fourth reacted with zinc granules to produce bubbles. Answer the following questions: (b) Why did bubbles form when zinc reacted with one of the solutions?
1 markCase study: During a science practical, a student tested four colourless solutions. One solution turned blue litmus red, another turned red litmus blue, the third showed no change with either litmus paper, and the fourth reacted with zinc granules to produce bubbles. Answer the following questions: (c) Which solution is most likely to have a pH greater than 7?
1 markCase study: During a science practical, a student tested four colourless solutions. One solution turned blue litmus red, another turned red litmus blue, the third showed no change with either litmus paper, and the fourth reacted with zinc granules to produce bubbles. Answer the following questions: (d) A neutral solution is formed by mixing the acidic and basic solutions in the correct proportion. Name the type of reaction involved.
1 mark