The observations made during an experiment are recorded below: Solution A B C D Blue litmus Reddish Deep Red No change Mauve Red litmus No change No change Blue Mauve (i) Which of these is Strongly acidic, Weakly acidic, Neutral, Basic? (ii) Which of the two solutions will react to illustrate the neutralisation reaction?

(i) Solution A is weakly acidic as it turned blue litmus to reddish and no change in red litmus. Solution B is strongly acidic as it turned blue litmus to deep red colour and no change in red litmus. Solution C is basic because it remained blue in colour and turned red litmus to blue colour. Solution D is neutral as it changed both blue and red litmus to mauve (light purple) colour. (ii) Solution A and solution C will illustrate the neutralisation reaction because solution A is acidic as it turned blue litmus red and Solution C is basic in nature as it turned red litmus blue. Therefore, they will react to form a salt neutral in nature. At the same, neutralisation takes place when solution B reacts with solution C because solution B is acidic and solution C is basic in nature.

E M B I B E

Science 7>Chapter 5 - Acids, Bases and Salts>Summative ASSESSMENT>Q 3

MEDIUM

7th CBSE

IMPORTANT

Earn 100

Choose the odd-one-out giving reason:
Litmus, lichens, natural dye, phenolphthalein

Important Questions on Acids, Bases and Salts

MEDIUM

7th CBSE

IMPORTANT

Science 7>Chapter 5 - Acids, Bases and Salts>Summative ASSESSMENT>Q 4

Choose the odd-one-out giving reason:

Turmeric, Yellow colour, Methyl orange, Plant product

MEDIUM

7th CBSE

IMPORTANT

Science 7>Chapter 5 - Acids, Bases and Salts>Summative ASSESSMENT>Q 5

Choose the odd-one-out giving reason:
Acids, Bitter taste, Soapy, Bases, Caustic soda

EASY

7th CBSE

IMPORTANT

Science 7>Chapter 5 - Acids, Bases and Salts>Summative ASSESSMENT>Q 1

Define: Mineral acids

MEDIUM

7th CBSE

IMPORTANT

Science 7>Chapter 5 - Acids, Bases and Salts>Summative ASSESSMENT>Q 2

Define: Acid-base indicators

EASY

7th CBSE

IMPORTANT

Science 7>Chapter 5 - Acids, Bases and Salts>Summative ASSESSMENT>Q 3

Define: Natural and synthetic indicators

MEDIUM

7th CBSE

IMPORTANT

Science 7>Chapter 5 - Acids, Bases and Salts>Summative ASSESSMENT>Q 4

Define: Neutralisation reaction

HARD

7th CBSE

IMPORTANT

Science 7>Chapter 5 - Acids, Bases and Salts>Summative ASSESSMENT>Q 5

Define: Treatment of indigestion

HARD

7th CBSE

IMPORTANT

Science 7>Chapter 5 - Acids, Bases and Salts>Summative ASSESSMENT>Q 1

The observations made during an experiment are recorded below:

Solution	A	B	C	D
Blue litmus	Reddish	Deep Red	No change	Mauve
Red litmus	No change	No change	Blue	Mauve

(i) Which of these is Strongly acidic, Weakly acidic, Neutral, Basic?
(ii) Which of the two solutions will react to illustrate the neutralisation reaction?