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Questions List of Chapter 2: Acids, Bases and Salts
- Question 1 - You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively
- Question 2 - Why should curd and sour substances not be kept in brass and copper vessels?
- Question 3 - Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?
- Question 4 - 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 the compounds formed is calcium chloride.
- Question 5 - Why do HCl, HNO3, etc show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character
- Question 6 - Why does an aqueous solution of an acid conduct electricity?
- Question 7 - Why does dry HCl gas not change the colour of the dry litmus paper?
- Question 8 - While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?
- Question 9 - How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted?
- Question 10 - How is the concentration of hydroxide ions (OH–) affected when excess base is dissolved in a solution of sodium hydroxide?
- Question 11 - You have two solutions A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration? Which of this is acidic and which one is basic?
- Question 12 - What effect does the concentration of H+ (aq) ions have on the nature of the solution?
- Question 13 - Do basic solutions also have H+ (aq) ions ? If yes, then why are these basic?
- Question 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)?
- Question 15 - What is the common name of the compound CaOCl2?
- Question 16 - Name the substance which on treatment with chlorine yields bleaching powder.
- Question 17 - Name the sodium compound which is used for softening hard water.
- Question 18 - What will happen if a solution of sodium hydrogen carbonate is heated. Give the equation of the reaction involved?
- Question 19 - Write an equation to show the reaction between Plaster of Paris and water.
- Question 20 - A solution turns red litmus blue, its pH is likely to be
- Question 21 - A solution reacts with crushed-egg shells to give a gas that turns lime-water milky. The solution contains:
- Question 22 - 10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HCl. If we take 20 mL of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralise it will be:
- Question 23 - Which one of the following types of medicines is used for treating indigestion?
- Question 24 - Write word equations and then balanced equations for the reaction taking place when:
- Question 25 - Compounds such as alcohol and glucose also contain hydrogen but are not categorised as acids. Describe an activity to prove it.
- Question 26 - Why does distilled water not conduct electricity, whereas rain water does?
- Question 27 - Why do acids not show acidic behaviour in the absence of water?
- Question 28 - Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively. Which solution is
- Question 29 - Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test tube A, while acetic acid (CH3COOH) is added to test tube B. In which test tube will the fizzing occur more vigorously and why?
- Question 30 - Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain your answer.
- Question 31 - A milkman adds a very small amount of baking soda to fresh milk.
- Question 32 - Plaster of Paris should be stored in a moisture-proof container. Explain why?
- Question 33 - What is a neutralisation reaction? Give two examples.
- Question 34 - Give two important uses of washing soda and baking soda.
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