HARD
Lower Secondary Stage 7
IMPORTANT
Earn 100

Draw and colour in your own pH scale and label each pH value with an example.

Important Questions on Acids and Alkalis

MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>Exercise 4>Q 13
Find the names of at least two indicators that scientists use. (You can use any books or Internet)
EASY
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>Exercise 4>Q 14
Why is universal indicator more useful than other indicators?
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>Exercise 4>Q 15
What is a disadvantage of using litmus indicator?
EASY
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>Exercise 6>Q 1
What pH does a neutral substance have?
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>Exercise 6>Q 2
Sometimes, acidic or alkaline solutions need to be neutralised. Describe how you could neutralise an acidic solution and how would you know that neutralisation has happened.
EASY
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>Exercise 6>Q 3
What colour would universal indicator change to if added to a neutral solution.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>Exercise 6>Q 4

Question Image

The simple experiment shown in the figure could be changed by using a measuring cylinder to add the alkali, and using the colour change of the indicator to estimate pH. How could you show the way that the pH changes as you neutralise the acid with an alkali?

EASY
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>End of chapter review>Q 1
Give the name of a substance which changes colour to show whether a substance is an acid, alkali or neutral.