The pH values of five solutions A, B, C, D and E are given below: Solution A B C D E p H 6 8 1 7 14 Which solution is: Neutral?

Solution with pH value 7 is neutral, and solution D is neutral in the given solutions because it contains equal amounts of hydrogen ions and hydroxide ions. The pH scale has values from 0 to 14. Neutral substances have a pH of exactly 7, acidic substances have pH 0-7 and basic substances have pH 7-14.

The pH values of five solutions A, B, C, D and E are given below: Solution A B C D E p H 6 8 1 7 14 Which solution is: Strongly alkaline?

Solution E is strongly alkaline because its pH value is 14. This means that the solution E contains a higher concentration of hydroxide ions. As pH increases basic(alkaline) nature increases. The pH scale has values from 0 to 14. pH ranges from 0-7 for acids and 7-14 for bases. Neutral substances have pH 7.

The pH values of five solutions A, B, C, D and E are given below: Solution A B C D E p H 6 8 1 7 14 Which solution is: Strongly acidic

Solution C is strongly acidic because it has a pH value of 1. This means that solution C contains a higher concentration of hydrogen ions. As pH value decreases acidic strength increases. The pH scale has values from 0 to 14. pH ranges from 0-7 for acids and 7-14 for bases. Neutral substances have pH 7.

The pH values of five solutions A, B, C, D and E are given below: Solution A B C D E p H 6 8 1 7 14 Which solution is: Weakly alkaline?

Solution B is weakly alkaline because it has a pH value of 8. This means that the solution B contains a lower concentration of hydroxide ions. As pH decreases, basic(alkaline) nature decreases. The pH scale has values from 0 to 14. pH ranges from 0-7 for acids and 7-14 for bases. Neutral substances have pH 7.

The pH values of five solutions A, B, C, D and E are given below: Solution A B C D E p H 6 8 1 7 14 Which solution is: Weakly acidic?

Solution A is weakly acidic because it has a pH value of 6. This means that the solution A contains a lower concentration of hydrogen ions. As pH value increases, acidic strength decreases. The pH scale has values from 0 to 14. pH ranges from 0-7 for acids and 7-14 for bases. Neutral substances have pH 7.

E M B I B E

WOW! SCIENCE Hands-on Learning in SCIENCE 7>Chapter 8 - Acids, Bases and Salts>EVALUATE>Q 2

HARD

7th CBSE

IMPORTANT

Earn 100

A tanker containing sulphuric acid met with an accident and the acid spilled on the road. Moreover, the iron drain covers on that road began melting and fizzing as the acid ran over them.

A chemist was called to check whether the acid actually leaked into the nearby river or not.

a) Suggest a method that the chemist must use to check if the river water contained any acid or not.

b) Name a better term that could be use in the place of 'Melting' in the above report.

c) What is the reason behind fizzing of iron drain covers when the acid ran over them?

Important Questions on Acids, Bases and Salts

MEDIUM

7th CBSE

IMPORTANT

WOW! SCIENCE Hands-on Learning in SCIENCE 7>Chapter 8 - Acids, Bases and Salts>EVALUATE>Q 3

The pH values of five solutions A, B, C, D and E are given below:

Solution	A	B	C	D	E
$p H$	$6$	$8$	$1$	$7$	$14$

Which solution is: Neutral?

MEDIUM

7th CBSE

IMPORTANT

WOW! SCIENCE Hands-on Learning in SCIENCE 7>Chapter 8 - Acids, Bases and Salts>EVALUATE>Q 3

The pH values of five solutions A, B, C, D and E are given below:

Solution	A	B	C	D	E
$p H$	$6$	$8$	$1$	$7$	$14$

Which solution is: Strongly alkaline?

EASY

7th CBSE

IMPORTANT

WOW! SCIENCE Hands-on Learning in SCIENCE 7>Chapter 8 - Acids, Bases and Salts>EVALUATE>Q 3

The pH values of five solutions A, B, C, D and E are given below:

Solution	A	B	C	D	E
$p H$	$6$	$8$	$1$	$7$	$14$

Which solution is: Strongly acidic

MEDIUM

7th CBSE

IMPORTANT

WOW! SCIENCE Hands-on Learning in SCIENCE 7>Chapter 8 - Acids, Bases and Salts>EVALUATE>Q 3

The pH values of five solutions A, B, C, D and E are given below:

Solution	A	B	C	D	E
$p H$	$6$	$8$	$1$	$7$	$14$

Which solution is: Weakly alkaline?

EASY

7th CBSE

IMPORTANT

WOW! SCIENCE Hands-on Learning in SCIENCE 7>Chapter 8 - Acids, Bases and Salts>EVALUATE>Q 3

The pH values of five solutions A, B, C, D and E are given below:

Solution	A	B	C	D	E
$p H$	$6$	$8$	$1$	$7$	$14$

Which solution is: Weakly acidic?

HARD

7th CBSE

IMPORTANT

WOW! SCIENCE Hands-on Learning in SCIENCE 7>Chapter 8 - Acids, Bases and Salts>EVALUATE>Value and life skills

We all know that the chemicals in our laboratory are very dangerous. Thus, safety measures need to be adopted while working in a lab. List down some of these measures and follow them when you visit your laboratory.

EASY

7th CBSE

IMPORTANT

WOW! SCIENCE Hands-on Learning in SCIENCE 7>Chapter 8 - Acids, Bases and Salts>EVALUATE>Q 1

Which one of the following is the weakest base?

EASY

7th CBSE

IMPORTANT

WOW! SCIENCE Hands-on Learning in SCIENCE 7>Chapter 8 - Acids, Bases and Salts>EVALUATE>Q 2

Which of the following salts is used in photography for developing films?