Question

6. Phenolphthalein synthetic indicator and its color being acidic, a basic solution respectively are-
(a) red and blue
(b) pink and colorless
(c) blue and red
(d) colorless and pink
7. Which of the following physical changes Is ?
(a) Cutting a wooden log into small pieces
(b) Burning of wood
(c) Ripening of fruits
(d) Cooking
8. Which is a method to prevent rust?
(A) Crystallization
(B) Galvanicatio
(C) Sedimentation
(D) None of these Growth
(D) None of these
10. The leaves, banners or flags of trees flutter when the wind blows. Why ?
(a) air occupies space
(b) air is a mixture of gases
(c) air exerts pressure
(d) air is colorless​

Answer 1

Answer:

6.colourless and pink

7.Cutting of log of wood into small pieces is a physical change

8.galvanization

10. air exerts pressure

Answer 2

Answer:

6.) Colourless : Acidic

Pink : Base

7.) Cutting a wooden log into small pieces

8.) Galvanication

9.) air exerts pressure