Indicators

Question 1 What is an indicator? Question 2 Name the common indicators used to test acid,bases and salts? Question 3 What are olfactory indicators.Give examples? Question 4 What is the colour of Phenolphthalein in acidic and basic medium? Question 5 What is the colour of methyl orange in acidic and basic medium? Acid,Bases and Salts On the…

Water Of crystallisation

Question 1 What is meant by water of crystallisation?Give example? Question 2 What are hydrated salts? Question 3 What are anhydrous salts? Question 4 Name a compound which contains two molecules of water of crystallisation? Question 5 Why copper sulphate is blue in colour? Water Of crystallisation The water molecules which form part of the structure…

Plaster Of Paris

Question 1 Write the chemical formula and name of plaster of paris?   Question 2 What is gypsum?   Question 3 Name the calcium compound which hardens on wetting with water?   Question 4 What will happen if heating is not controlled while preparing plaster of paris?   Question 5 Name the compound which is…

Bleaching powder

Question 1 A white powdery substance having strong smell of chlorine is used for disinfecting drinking water supply at water works.Identify the substance? Question 2 Write the chemical name and formula of bleaching powder? Question 3 How is bleaching powder prepared.Give the chemical equation? Question 4 State uses of bleaching powder? Question 5 List few…

Baking soda

Question 1 Write the chemical name and formula of baking soda? Question 2 Give uses of baking soda? Question 3 Describe how baking soda is produced on a large scale? Question 4 Name the gas evolved when baking soda is heated? Question 5 What is baking powder? Question 6 Give few properties of baking powder?…

Washing soda

Question 1 What is the chemical name and formula of washing soda? Question 2 What is soda ash? Question 3 Name a metal compound which has detergent properties? Question 4 Name a sodium compound used for making borax and glass? Question 5 Explain the preparation of washing soda by solvay’s process? question 6 Give uses…

Sodium hydroxide

Question 1 Write the chemical name and formula of caustic soda? Question 2 What happens when a concentrated solution of sodium hydroxide is electrolysed.Write the equation involved? Question 3 Name the raw material used for the caustic soda? Question 4 List the uses of caustic soda? Question 5 What is a brine solution? Sodium Hydroxide…

Common salt

Question 1 What is a salt?Give example? Question 2 Give the name and formula of any two salts.Also name the acids from which they are formed? Question 3 What is meant by family of salts? Question 4 Write the chemical name and formula of common salt? Question 5 How is common salt obtained from sea…

Importance of pH in everyday life

Question 1 What happens during a honey bee sting.What is its remedy? Question 2 Under what soil conditions do you think a farmer would treat the soil of his field with quicklime? Question 3 What happen if there is an excess of acid in the stomach.How can its effects be cured? Question 4 Explain the…

Universal Indicator

Question 1 What are universal indicators? Question 2 For what purpose a universal indicator is used? Question 3 Water is neutral.What colour will you get when you add few drops of universal indicator to a a test tube containing water? Question 4 A solution X and Y is tested with universal indicator. X turns orange…

Strength of acid and base:pH Scale

Question 1 What does pH of a solution signify? Question 2 You have 2 solutions A and B.The pH of solution A is 6 and pH of solution B is 8.Which of the solution has more hydrogen ion concentration? Question 3 Three solutions A,B and C have pH values of 6,4 and 10.Which of the…

Bases

Question 1 Define a base.Give example? Question 2 What are alkali? Question 3 What is common in all bases? Question 4 What are strong bases.Give example? Question 5 What are weak bases.Give example? Question 6 What happen when zinc granules are heated with sodium hydroxide solution? Question 7 What happen when a base react with…

Common in acids

 Question 1 Why HCl show acidic behaviour whereas glucose and alcohol do not show acidic behaviour? Question 2 Why does an aqueous solution of an acid conduct electricity? Question 3 Why does dry HCl gas not change the colour of the dry litmus paper? Question 4 Why does distilled water no conduct electricity whereas rain…

Acids and their properties

Question 1 What are acids?Give example? Question 2 What are organic acids.Give example? Question 3 What are mineral acids.Give example? Question 4 What are strong acids? Question 5 What are weak acids? Question 6 What are dilute acids? Question 7 What are concentrated acids? Question 8 Which gas is usually liberated when an acid react…