SSSSS
6. Why does an aqueous solution of an acid conduct electricity?
7. Why does dry HCl gas not change the colour of the dry litmus paper?
8. While diluting an acid, why is it recommended that the acid should be added to water and not
water to the acid?
9. How is the concentration of hydronium ions (HO) affected when a solution of an acid is
diluted?
10. How is the concentration of hydroxide ions (OH) affected when excess base is dissolved in a
solution of sodium hydroxide?
11. You have two solutions, A and B. The pH of solution A is 6 and pH of solution Bis 8. Which
solution has more hydrogen ion concentration? Which of this is acidic and which one is basic?
12. What effect does the concentration of H(aq) ions have on the nature of the solution?
13. Do basic solutions also have H(aq) ions? If yes, then why are these basic?
14. Under what soil condition do you think a farmer would treat the soil of his fields with quick
lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?
15. Blue and red litmus papers are placed simultaneously in a colourless aqueous solution. It is
found that the colour of both litmus papers is red. What is the nature of the solution and why?
16. A strip of absolutely clear cloth is sprayed with onion juice. The strip is then rubbed with few
drops of hydrochloric acid. Will the strip smell like onion? Give a reason for your Ans.
17. Name two metals which react with concentrated sodium hydroxide solution to liberate
hydrogen gas.
18. Name an alkali solution which has no metallic ion.
19. What is a universal indicator?
20. The pH of a sample of vegetable soup was found to be 6.5. How is this soup likely to taste?
21. Name the acid present in ant sting. [2010 (T-1)]
22. Why is it advised not to use copper or brass vessels to store pickles or curd? [2010 (T-1)
23. Which bases are called alkalises? Give an example of an alkali. [2010 (T-1)
24. Why does tooth decay start when the pH of the mouth is lower than 5.52 (2009
25. What effect does an increase in concentration of H+(aq) in a solution have on the pH of the
solution?
26. Name the gas evolved when dilute HCl reacts with sodium hydrogen carbonate. How is it
recognised?
27. Name the gas usually liberated when a dilute acid reacts with a metal. What happens when a
burning candle is brought near this gas? [20091
28. Dry ammonia gas has no action on litmus paper, but a solution of ammonia in water turns red
litmus paper blue. Why is it so? [2005]
29. Which will be more acidic and why?
a. A solution with pH value of 6.0 or
b. A solution with pH vlaue of 5.0. [2004]
30. Why are all alkalis bases, but not all bases alkalises?
31. Why does nitric acid not produce hydrogen, when treated with metals?
32. Metal hydroxides and metal oxides are called bases. Explain and support your Ans by balanced
chemical equations.
33. Match the acids given in Column (A) with their correct sources given in Column (B). [HOTS
Answers
Answer:
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Explanation:
SSSSS
6. Why does an aqueous solution of an acid conduct electricity?
7. Why does dry HCl gas not change the colour of the dry litmus paper?
8. While diluting an acid, why is it recommended that the acid should be added to water and not
water to the acid?
9. How is the concentration of hydronium ions (HO) affected when a solution of an acid is
diluted?
10. How is the concentration of hydroxide ions (OH) affected when excess base is dissolved in a
solution of sodium hydroxide?
11. You have two solutions, A and B. The pH of solution A is 6 and pH of solution Bis 8. Which
solution has more hydrogen ion concentration? Which of this is acidic and which one is basic?
12. What effect does the concentration of H(aq) ions have on the nature of the solution?
13. Do basic solutions also have H(aq) ions? If yes, then why are these basic?
14. Under what soil condition do you think a farmer would treat the soil of his fields with quick
lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?
15. Blue and red litmus papers are placed simultaneously in a colourless aqueous solution. It is
found that the colour of both litmus papers is red. What is the nature of the solution and why?
16. A strip of absolutely clear cloth is sprayed with onion juice. The strip is then rubbed with few
drops of hydrochloric acid. Will the strip smell like onion? Give a reason for your Ans.
17. Name two metals which react with concentrated sodium hydroxide solution to liberate
hydrogen gas.
18. Name an alkali solution which has no metallic ion.
19. What is a universal indicator?
20. The pH of a sample of vegetable soup was found to be 6.5. How is this soup likely to taste?
21. Name the acid present in ant sting. [2010 (T-1)]
22. Why is it advised not to use copper or brass vessels to store pickles or curd? [2010 (T-1)
23. Which bases are called alkalises? Give an example of an alkali. [2010 (T-1)
24. Why does tooth decay start when the pH of the mouth is lower than 5.52 (2009
25. What effect does an increase in concentration of H+(aq) in a solution have on the pH of the
solution?
26. Name the gas evolved when dilute HCl reacts with sodium hydrogen carbonate. How is it
recognised?
27. Name the gas usually liberated when a dilute acid reacts with a metal. What happens when a
burning candle is brought near this gas? [20091
28. Dry ammonia gas has no action on litmus paper, but a solution of ammonia in water turns red
litmus paper blue. Why is it so? [2005]
29. Which will be more acidic and why?
a. A solution with pH value of 6.0 or
b. A solution with pH vlaue of 5.0. [2004]
30. Why are all alkalis bases, but not all bases alkalises?
31. Why does nitric acid not produce hydrogen, when treated with metals?
32. Metal hydroxides and metal oxides are called bases. Explain and support your Ans by balanced
chemical equations.
33. Match the acids given in Column (A) with their correct sources given in Column (B). [HOTS