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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.

Q9 Potatoes grow well on Ram’s farm which has with pH of 5.5. Now he 1

wants to grow broccoli instead of potato in the same farm. Suggest him
a method to do so.

Q10 What is the name and formula of the hardest substance of the body ? 1

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