Page 2 - HOME ASSIGNMENT-1-(CH-2-CONTENT MAPPING )

Q8 Give two examples of strong and weak bases. 1

Q9 What colours does phenolphthalein turn when added to a base or an 1

acid?

Q10 Give two examples of mineral and organic acids. 1

Concept _pH

Q1. What is the relationship between pH of a solution and concentration of 1

hydrogen ions?

Q2 Which substance is injected when we touch leaves of a nettle plant? 1

Q3 What is the importance of universal indicator? 1

Q4 Which colours will be produced when magnesium hydroxide and sodium 1

hydroxide are to universal indicators?

Q5 Separate the following into substances having pH values above and 1

below 7.

Lemon juice, solution of washing soda, toothpaste, vinegar and stomach
juice

Q6. The daffodil plants grow best in a soil having a pH of 6.0 to 6.5. If the soil 1
in a garden has a pH of 4.5, which substance needs to be added to the

soil in order to grow daffodils?

Q7. It has been found that rubbing vinegar on the stung area of the skin of a 1

person gives him relief. The person has been stung by which of the
followings?

Ant, honey bee, nettle leaf hair and wasp

Q8 The results of solutions tested with universal indicator are as follows 1

Sulphuric acid: Red, Metal polish: Dark blue, Washing up liquid: yellow,

Milk of magnesia: light blue, Oven cleaner: purple, Car battery acid: pink.

Arrange the above solutions in order of their increasing pH values.

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