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Class 6	Science Mathematics Social Science	English Hindi Computer
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Class 5	EVS
College Entrance	Jamia Millia Islamia Aligarh Muslim University Banaras Hindu University

2020

Q21
List the important products of the Chlor-alkali process. Write one important use of each.

Solution

Q22
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

Q23
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

Q24
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?

Solution

Q25
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

Q26
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

Q27
Why is chemical communication better than electrical impulses as a means of communication between cells in a multicellular organism?

Solution

Q28
Define the term pollination. Differentiate between self-pollination and cross-pollination. What is the significance of pollination?

Solution

Q29
What are homologous structures? Give an example. Is it necessary that homologous structures always have a common ancestor. Justify your answer.

Solution

Q30
Why is Tyndall effect shown by colloidal particles? State four instances of observing the Tyndall effect.

Solution

Subjects

2020

Q21 List the important products of the Chlor-alkali process. Write one important use of each.

Solution

Q22 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

Q23 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

Q24 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?

Solution

Q25 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

Q26 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

Q27 Why is chemical communication better than electrical impulses as a means of communication between cells in a multicellular organism?

Solution

Q28 Define the term pollination. Differentiate between self-pollination and cross-pollination. What is the significance of pollination?

Solution

Q29 What are homologous structures? Give an example. Is it necessary that homologous structures always have a common ancestor. Justify your answer.

Solution

Q30 Why is Tyndall effect shown by colloidal particles? State four instances of observing the Tyndall effect.

Solution

Subjects

Q21
List the important products of the Chlor-alkali process. Write one important use of each.

Q22
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.

Q23
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?

Q24
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?

Q25
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.

Q26
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?

Q27
Why is chemical communication better than electrical impulses as a means of communication between cells in a multicellular organism?

Q28
Define the term pollination. Differentiate between self-pollination and cross-pollination. What is the significance of pollination?

Q29
What are homologous structures? Give an example. Is it necessary that homologous structures always have a common ancestor. Justify your answer.

Q30
Why is Tyndall effect shown by colloidal particles? State four instances of observing the Tyndall effect.