3. Read the following and answer any four questions from (i) to (v) A group of students measured the pH of some substances they found in their homes. Their results are given in the following table

(a) Which solution is the most acidic?
(i) Apples
(ii) Vinegar
(iii) Lemon Juice
(iv) Black Coffee
Ans: (iii) Lemon juice
(b) Which solution is the most alkaline ?
(i) Household ammonia
(ii) Washing soda
(iii) Baking soda
(iv) Toothpaste
Ans: (i) Household ammonia
(c) Which solutions are neutral ?
(i) Salt
(ii) Sugar
(iii) Milk

(iv) Both (i) and (ii)
Ans: (iv) Both (i) and (ii)
(iv) What will be the litmus test if the
solution is basic?
(a) Red litmus will turn to blue
(b) Blue litmus will turn to red
(c) No change in colour
(d) It will change into orange pink.
Ans: (a) Red litmus will turn to blue

(v) Arrange the following in order of the
increasing basic strengths.
Baking soda, Toothpaste, Household
ammonia, Washing soda
(a) Baking soda, Toothpaste, Household
ammonia, Washing soda
(b) Baking soda, Toothpaste, Washing soda,
Household ammonia
(c) Washing soda, Baking soda, Toothpaste,
Household ammonia
(d) Baking soda, Household ammonia,
Toothpaste, Washing soda
Higher the pH, the stronger the base
Ans: (b) Baking soda, Toothpaste, Washing
soda, Household ammonia