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Q21
17. Differentiate between a glass slab and a glass prism.
What happens when a narrow beam of (i) a monochromatic light, and (ii) white light passes through (a) glass slab and (b) glass prism?

Free Response Question Hard View solution

Q22
18. Draw a labelled diagram to show (i) reddish appearance of the sun at the sunrise or the sunset and (ii) white appearance of the sun at noon when it is overhead.

Free Response Question Medium View solution

Q23
19. (a) List in tabular form two differences between binary fission and multiple fission.

Free Response Question Medium View solution

Q24
19. (b) What happens when a mature Spirogyra filament attains considerable length.

Free Response Question Medium View solution

Q25
20. List the important products of the Chlor-alkali process. Write one important use of each.

Free Response Question Hard View solution

Q26
20. How is washing soda prepared from sodium carbonate? Give its chemical equation. State the type of this salt. Name the type of hardness of water which can be removed by it.

Free Response Question Hard View solution

Q27
21. 3ml of ethanol is taken in a test tube and warmed gently in a water bath. A 5% solution of alkaline potassium permanganate is added first drop by drop to this solution, then in excess.
(i) How is the 5% solution of KMnO₄ prepared?

Free Response Question Hard View solution

Q28
21. 3ml of ethanol is taken in a test tube and warmed gently in a water bath. A 5% solution of alkaline potassium permanganate is added first drop by drop to this solution, then in excess.
(ii) State the role of alkaline potassium permanganate in this reaction. What happens on adding it in excess?

Free Response Question Hard View solution

Q29
21. 3ml of ethanol is taken in a test tube and warmed gently in a water bath. A 5% solution of alkaline potassium permanganate is added first drop by drop to this solution, then in excess.
(iii) Write chemical equation of this reaction.

Free Response Question Hard View solution

Q30
18. A squirrel is in a scary situation. Its body has to prepare for either fighting or running away. State the immediate changes that take place in its body so that the squirrel is able to either fight or run?

Free Response Question Medium View solution

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2020

Q21
17. Differentiate between a glass slab and a glass prism.
What happens when a narrow beam of (i) a monochromatic light, and (ii) white light passes through (a) glass slab and (b) glass prism?

Solution

Q22
18. Draw a labelled diagram to show (i) reddish appearance of the sun at the sunrise or the sunset and (ii) white appearance of the sun at noon when it is overhead.

Solution

Q23
19. (a) List in tabular form two differences between binary fission and multiple fission.

Solution

Q24
19. (b) What happens when a mature Spirogyra filament attains considerable length.

Solution

Q25
20. List the important products of the Chlor-alkali process. Write one important use of each.

Solution

Q26
20. How is washing soda prepared from sodium carbonate? Give its chemical equation. State the type of this salt. Name the type of hardness of water which can be removed by it.

Solution

Q27
21. 3ml of ethanol is taken in a test tube and warmed gently in a water bath. A 5% solution of alkaline potassium permanganate is added first drop by drop to this solution, then in excess.
(i) How is the 5% solution of KMnO₄ prepared?

Solution

Solution

Q29
21. 3ml of ethanol is taken in a test tube and warmed gently in a water bath. A 5% solution of alkaline potassium permanganate is added first drop by drop to this solution, then in excess.
(iii) Write chemical equation of this reaction.

Solution

Q30
18. A squirrel is in a scary situation. Its body has to prepare for either fighting or running away. State the immediate changes that take place in its body so that the squirrel is able to either fight or run?

Solution

Subjects

2020

Q21 17. Differentiate between a glass slab and a glass prism. What happens when a narrow beam of (i) a monochromatic light, and (ii) white light passes through (a) glass slab and (b) glass prism?

Solution

Q22 18. Draw a labelled diagram to show (i) reddish appearance of the sun at the sunrise or the sunset and (ii) white appearance of the sun at noon when it is overhead.

Solution

Q23 19. (a) List in tabular form two differences between binary fission and multiple fission.

Solution

Q24 19. (b) What happens when a mature Spirogyra filament attains considerable length.

Solution

Q25 20. List the important products of the Chlor-alkali process. Write one important use of each.

Solution

Q26 20. How is washing soda prepared from sodium carbonate? Give its chemical equation. State the type of this salt. Name the type of hardness of water which can be removed by it.

Solution

Q27 21. 3ml of ethanol is taken in a test tube and warmed gently in a water bath. A 5% solution of alkaline potassium permanganate is added first drop by drop to this solution, then in excess. (i) How is the 5% solution of KMnO₄ prepared?

Solution

Solution

Q29 21. 3ml of ethanol is taken in a test tube and warmed gently in a water bath. A 5% solution of alkaline potassium permanganate is added first drop by drop to this solution, then in excess. (iii) Write chemical equation of this reaction.

Solution

Q30 18. A squirrel is in a scary situation. Its body has to prepare for either fighting or running away. State the immediate changes that take place in its body so that the squirrel is able to either fight or run?

Solution

Subjects

Q21
17. Differentiate between a glass slab and a glass prism.
What happens when a narrow beam of (i) a monochromatic light, and (ii) white light passes through (a) glass slab and (b) glass prism?

Q22
18. Draw a labelled diagram to show (i) reddish appearance of the sun at the sunrise or the sunset and (ii) white appearance of the sun at noon when it is overhead.

Q23
19. (a) List in tabular form two differences between binary fission and multiple fission.

Q24
19. (b) What happens when a mature Spirogyra filament attains considerable length.

Q25
20. List the important products of the Chlor-alkali process. Write one important use of each.

Q26
20. How is washing soda prepared from sodium carbonate? Give its chemical equation. State the type of this salt. Name the type of hardness of water which can be removed by it.

Q27
21. 3ml of ethanol is taken in a test tube and warmed gently in a water bath. A 5% solution of alkaline potassium permanganate is added first drop by drop to this solution, then in excess.
(i) How is the 5% solution of KMnO₄ prepared?

Q29
21. 3ml of ethanol is taken in a test tube and warmed gently in a water bath. A 5% solution of alkaline potassium permanganate is added first drop by drop to this solution, then in excess.
(iii) Write chemical equation of this reaction.

Q30
18. A squirrel is in a scary situation. Its body has to prepare for either fighting or running away. State the immediate changes that take place in its body so that the squirrel is able to either fight or run?