EASY
Lower Secondary Stage 7
IMPORTANT
Earn 100

A chemical could cause the skin to become red and itchy if it is in contact with the skin. What hazard symbol would you use for this chemical?

Important Questions on Acids and Alkalis

EASY
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>Exercise 3>Q 5

Complete the following table on litmus indicator colours in acids and alkalis.

  Colour of red litmus paper Colour of blue litmus paper
In acidic solution    
In alkaline solution    
EASY
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>Exercise 3>Q 6
What colour would blue litmus turn in hydrochloric acid?
EASY
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>Exercise 3>Q 7
What colour would red litmus turn in sodium hydroxide?
EASY
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>Exercise 4>Q 8
Acids and alkalies can have a range of pH values depending on whether they are strong or weak. What range of pH does a strong acid have?
EASY
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>Exercise 4>Q 8
Acids and alkalis can have a range of pH values depending on whether they are strong or weak. What range of pH does a weak alkali have?
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>Exercise 4>Q 9

State whether the following is an acid, alkali or a neutral substance. If it is an acid or alkali, you should also say whether they are strong or weak.

  • A substance with a pH of 3.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>Exercise 4>Q 9

State whether the following is an acid, alkali or a neutral substance. If it is an acid or alkali, you should also say whether they are strong or weak.

  • A liquid with a pH of 8.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>Exercise 4>Q 9

State whether the following is an acid, alkali or a neutral substance. If it is an acid or alkali, you should also say whether they are strong or weak.

  • A substance which turns universal indicator yellow.