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Q1
Write the name and formula of the 2nd member of homologous series having general formula CₙH₂ₙ.

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Q2
List two functions performed by the testis in human beings.

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Q3
What is the function of ozone in the upper atmosphere?

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Q4
List four characteristics of the images formed by plane mirrors.

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Q5
Why are forests considered “biodiversity hot spots”? List two ways in which an individual can contribute effectively to the management of forests and wildlife.

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Q6
What is meant by “sustainable management”? Why is reuse considered better than recycling?

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Q7
With the help of an example, explain the process of hydrogenation. Mention the essential conditions for the reaction and state the change in physical property with the formation of the product.

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Q8
What is the difference between the molecules of soaps and detergents, chemically? Explain the cleansing action of soaps.

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Q9
How many groups and periods are there in the modern periodic table? How do the atomic size and metallic character of elements vary as we move:
(i) down a group and (ii) from left to right in a period?

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Q10
From the following elements:
₄Be ; ₉F ; ₁₉K ; ₂₀Ca
(i) Select the element having one electron in the outermost shell.
(ii) two elements of the same group.
Write the formula of and mention the nature of the compound formed by the union of 19K and element X (2,8,7).

Free Response Question Medium View solution

2015

Q1
Write the name and formula of the 2nd member of homologous series having general formula CₙH₂ₙ.

Solution

Q2
List two functions performed by the testis in human beings.

Solution

Q3
What is the function of ozone in the upper atmosphere?

Solution

Q4
List four characteristics of the images formed by plane mirrors.

Solution

Q5
Why are forests considered “biodiversity hot spots”? List two ways in which an individual can contribute effectively to the management of forests and wildlife.

Solution

Q6
What is meant by “sustainable management”? Why is reuse considered better than recycling?

Solution

Q7
With the help of an example, explain the process of hydrogenation. Mention the essential conditions for the reaction and state the change in physical property with the formation of the product.

Solution

Q8
What is the difference between the molecules of soaps and detergents, chemically? Explain the cleansing action of soaps.

Solution

Q9
How many groups and periods are there in the modern periodic table? How do the atomic size and metallic character of elements vary as we move:
(i) down a group and (ii) from left to right in a period?

Solution

Q10
From the following elements:
₄Be ; ₉F ; ₁₉K ; ₂₀Ca
(i) Select the element having one electron in the outermost shell.
(ii) two elements of the same group.
Write the formula of and mention the nature of the compound formed by the union of 19K and element X (2,8,7).

Solution

Subjects

2015

Q1 Write the name and formula of the 2nd member of homologous series having general formula CₙH₂ₙ.

Solution

Q2 List two functions performed by the testis in human beings.

Solution

Q3 What is the function of ozone in the upper atmosphere?

Solution

Q4 List four characteristics of the images formed by plane mirrors.

Solution

Q5 Why are forests considered “biodiversity hot spots”? List two ways in which an individual can contribute effectively to the management of forests and wildlife.

Solution

Q6 What is meant by “sustainable management”? Why is reuse considered better than recycling?

Solution

Q7 With the help of an example, explain the process of hydrogenation. Mention the essential conditions for the reaction and state the change in physical property with the formation of the product.

Solution

Q8 What is the difference between the molecules of soaps and detergents, chemically? Explain the cleansing action of soaps.

Solution

Q9 How many groups and periods are there in the modern periodic table? How do the atomic size and metallic character of elements vary as we move: (i) down a group and (ii) from left to right in a period?

Solution

Q10 From the following elements: ₄Be ; ₉F ; ₁₉K ; ₂₀Ca (i) Select the element having one electron in the outermost shell. (ii) two elements of the same group. Write the formula of and mention the nature of the compound formed by the union of 19K and element X (2,8,7).

Solution

Subjects

Q1
Write the name and formula of the 2nd member of homologous series having general formula CₙH₂ₙ.

Q2
List two functions performed by the testis in human beings.

Q3
What is the function of ozone in the upper atmosphere?

Q4
List four characteristics of the images formed by plane mirrors.

Q5
Why are forests considered “biodiversity hot spots”? List two ways in which an individual can contribute effectively to the management of forests and wildlife.

Q6
What is meant by “sustainable management”? Why is reuse considered better than recycling?

Q7
With the help of an example, explain the process of hydrogenation. Mention the essential conditions for the reaction and state the change in physical property with the formation of the product.

Q8
What is the difference between the molecules of soaps and detergents, chemically? Explain the cleansing action of soaps.

Q9
How many groups and periods are there in the modern periodic table? How do the atomic size and metallic character of elements vary as we move:
(i) down a group and (ii) from left to right in a period?

Q10
From the following elements:
₄Be ; ₉F ; ₁₉K ; ₂₀Ca
(i) Select the element having one electron in the outermost shell.
(ii) two elements of the same group.
Write the formula of and mention the nature of the compound formed by the union of 19K and element X (2,8,7).