Here is a question list for chapter 3- Acids, Base and Salts, Physical Science text book, TS.
PS: Leave a comment, in case of any doubts.
Topic: Acid, Base and Salts
Short Q&A (2 or 1 marks)
- What are olfactory indicators? Give examples
- What colours do the following indicators turn when added to base
- Methyl orange b. Red Litmus c. Turmeric d.Phenolphthalein
- Give the names of any 2 strong acids and any 2 weak acids.
- Give the names of any 2 strong bases and any 2 weak bases.
- Name a natural source for the following acids
- Citric acid b.Acetic acid c.Oxalic acid d.Lactic acid
- What is an indicator? Give some examples.
- What are organic acids? What are mineral acids?
- You are provided with 3 test tubes, each containing distilled water, acid and base solution. If you are given only blue litmus paper, how do you identify the contents of the test tube.
- Complete the table
Sample Solution Red Litmus Paper Blue Litmus Paper Phenolphthalein Methyl Orange HCl Red HNO3 Colourless NaOH Yellow Ca(OH)2 No change
- Which gas is evolved when acid reacts with metal? How do you test it?
- Why are acids not stored in metal containers?
- What happens when HCl is reacted with Aluminium metal. Write an equation.
- How is Sodium Zincate formed?
- What happens when dil.HCl is reacted with baking soda. Write an equation.
- A solution reacts with crushed egg shells to produce a gas which extinguishes a burning candle and also turns lime water milky. Identify the solution. Which gas is evolved? Write an equation for the given reaction.
- What is neutralisation reaction?
- Tap water conducts electricity but distilled water does not. Why?
- A metal compound A reacts with dil.HCl to produce effervescence. The gas evolved extinguishes a burning candle and also turns lime water milky. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.
- Why do aqueous solution of acids conduct electricity?
- Why does dry HCl gas does not change the colour of litmus paper?
- What happens when sulphuric acid is added to copper oxide?
- While diluting an acid, it is always recommended to add acid to water and never water to acid. Why?
- Equal length of Magnesium ribbon are dipped into test-tube A and test-tube B. Test-tube A contains aqueous HCl and test-tube B contains vinegar. In which test-tube will there be more fizzing (or more vigorous reaction) and why?
- What is alkali? Give example
- What is tooth decay?
- Ramesh was suffering from stomach pain due to indigestion. He was asked to take an antacid. Will antacid help in mitigating his pain? Justify.
- Give examples of antacids?
- Write a chemical reaction to prepare washing soda?
- How do you treat a honey bee sting?
- What is a Universal Indicator?
- Complete the table
Sample Solution Colour on pH paper pH value Nature of Sample Soft drinks Weakly Acidic Blood Greenish-Blue Pure water 7 Lemon Juice Acidic Toothpaste 8 Milk of Magnesia Purple
- What is acid rain? How does it affect aquatic life?
- What is meant by brine solution?
- You have 2 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 solution is acidic?
- Give 2 examples of Acidic Salts.
- Give 2 examples of Alkaline Salts.
- Classify the given salts into Families- Calcium Chloride, Sodium Sulphate, Potassium Sulphate, Potassium Chloride, Ammonium Carbonate, Calcium Carbonate, Sodium Chloride, Potassium Nitrate.
- Write the formula for the following salts and identify the acid and bases from which these salts are obtained: Potassium Sulphate, Sodium Sulphate, Sodium Nitrate, Ammonium Chloride.
- What is Chlor-Alkali process?
- List the uses of products formed from Chlor-Alkali process.
- How is bleaching powder prepared? Write an equation.
- When baking powder is added to dough, it makes the cake soft and spongy. Why? Write a chemical equation.
- List the uses of washing soda.
- What is water of crystallization?
- List the uses of Calcium Sulphate Hemihydrate.
- How is gypsum prepared?
- What happens when copper sulphate crystals are heated?
- Five solutions A,B,C,D and E have pH as 4,1,11,7 and 9, respectively. Arrange the solutions in increasing order of hydrogen ion concentration. Classify the solutions as acidic, alkaline and neutral
- Why should Plaster of Paris be stored in water-proof container?
- To dil.HCl solution, Phenolphthalein was added and subsequently, Sodium Hydroxide solution was added drop-wise and an appearance of pink colour was observed. What do you infer from this observation?
4 Marks Q&A
- Compounds such as alcohols and glucose contain hydrogen but are not categorized as acids. Describe an activity to prove it.
- Write an activity for the chemical reaction between metals with acids. How would you identify the gas which is released in this reaction?
- A white shirt has yellow stain of curry. When soap is rubbed on the shirt during washing, the yellow stain turns reddish-brown.
- Name the natural indicator present in the curry stain.
- Explain the changes in the color of the indicator which takes place during washing.
- What is the nature of soap as shown by the indicator.
- You have two solutions A & B. The pH of0 solution A is 6. The pH of solution B is 8. Which solution has more hydrogen ion concentration? What colours will be seen on the universal indicator for A & B? Which solution is acidic / alkaline.
- Describe an activity show the reaction between metal carbonate and acid.
- Through an activity show the reaction between metal oxide and acid. From the product of the reaction, comment on the nature of metal oxide.
- Acids behave as acids only in solutions. Justify this statement through an activity.
- List and discuss the importance of pH in daily life.
- Through an activity, discuss on water of crystallization.
- Read the information given in the table and answer the following questions.
- List out the acids in the below table.
- What is the nature of the solution which gives pink color with Phenolphthalein solution.
- List out neutral solution
- Name the strongest acid and strongest base among the given solutions.
Solution pH Value With Phenolphthalein With Methyl Orange HCl 1 No color change Turns into red Distilled water 7 No color change No color change NaOH 13 Turns into pink Turns into yellow Lemon juice 2.5 No color change Turns into red NaCl 7 No color change No color change Baking soda 8 Turns into pink Turns into yellow