NCERT Exemplar Science - Class 9>Chapter 2 - Is Matter Around Us Pure?>Long Answer Questions>Q 38

MEDIUM

9th CBSE

IMPORTANT

Earn 100

Classify churning of milk cream to get butter, as a physical or a chemical change. Give reason.

Important Questions on Is Matter Around Us Pure?

MEDIUM

9th CBSE

IMPORTANT

NCERT Exemplar Science - Class 9>Chapter 2 - Is Matter Around Us Pure?>Long Answer Questions>Q 39

During an experiment the students were asked to prepare a

10 %

(Mass/Mass) solution of sugar in water. Ramesh dissolved

10 g

of sugar in

100 g

of water while Sarika prepared it by dissolving

10 g

of sugar in water to make

100 g

of the solution.
Are the two solutions of the same concentration?

HARD

9th CBSE

IMPORTANT

NCERT Exemplar Science - Class 9>Chapter 2 - Is Matter Around Us Pure?>Long Answer Questions>Q 39

During an experiment the students were asked to prepare a

10 %

(Mass/Mass) solution of sugar in water. Ramesh dissolved

10 g

of sugar in

100 g

of water while Sarika prepared it by dissolving

10 g

of sugar in water to make

100 g

of the solution.
Compare the mass % of the two solutions.

HARD

9th CBSE

IMPORTANT

NCERT Exemplar Science - Class 9>Chapter 2 - Is Matter Around Us Pure?>Long Answer Questions>Q 40

You are provided with a mixture containing sand, iron filings, ammonium chloride and sodium chloride. Describe the procedures you would use to separate these constituents from the mixture?

HARD

9th CBSE

IMPORTANT

NCERT Exemplar Science - Class 9>Chapter 2 - Is Matter Around Us Pure?>Long Answer Questions>Q 41

Arun has prepared

0.01 %

(by mass) solution of sodium chloride in water. Which of the following correctly represents the composition of the solutions?

HARD

9th CBSE

IMPORTANT

NCERT Exemplar Science - Class 9>Chapter 2 - Is Matter Around Us Pure?>Long Answer Questions>Q 42

Calculate the mass of sodium sulphate required to prepare its

20 %

(mass percent) solution in

100 g

of water?