Question

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Q-23 What happens when Red and blue iitius paper is added
to Acid and base solutions?
Q-24 Watch the given figure carefully and explain the process
occur here.
Q-25 Explain why an Antacid tablet is taken when you
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Answer 1

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Answer 2

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Question 1) Why does the flow of acid rain water into a river make the survival of aquatic life in the river difficult?

Question 2) Write balanced chemical equations for the reactions taking place when dry blue crystals of copper sulphate are dropped into concentrated sulphuric acid.

Question 3) Name the products formed when sodium hydrogen carbonate is heated. Write the chemical equation for the reaction involved.

SolutionFormula of sodium hydrogen carbonate is NaHCO3.

when it is heated it forms water , carbon dioxide and and sodium carbonate.

2NaHCO3 --> H2O + CO2 + Na2CO3

Question 4) Two solutions A and B have pH values of 5 and 8 respectively. Which solution will be basic in nature?

SolutionSolution B as pH > 7

Question 5) Why does tooth decay start when the pH of mouth is lower than 5.5?

Question 6) How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted?

Question 7) Fresh milk has a pH of 6. When it changes into curd (Yogurt), will its pH value increase or decrease? Why?

SolutionFresh milk has a pH of 6, before conversion. When milk is turned into curd then its pH value will decrease due to the production of lactic acid in curd which is acidic in nature.

8) A dry pellet of a common base B, when kept in open absorbs moisture and turns sticky. The compound is also a by – product of chlorine – alkali process. Identify B. What type of reaction occurs when B is treated with an acidic oxide? Write a balanced chemical equation for one such solution.

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