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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

Q11
8. The chemical formula of Plaster of Paris is:

Solution

Q12
9. In a double displacement reaction such as the reaction between sodium sulphate solution and barium chloride solution:
(A) exchange of atoms takes place
(B) exchange of ions takes place
(C) a precipitate is produced
(D) an insoluble salt is produced
The correct option is:

Solution

Q13
10. Baking soda is a mixture of:

Solution

Q14
11. in an ecosystem, 10% of energy available for transfer from one trophic level to the next is in the form of:

Solution

Q15
12. Soil fertility is determined by its ability to:

Solution

Q16
13. Assertion (A): In a homologous series of alcohols, the formula for the second member is C₂H₅OH and the third member is C₃H₇OH.
Reason (R): The difference between the molecular masses of the two consecutive members of a homologous series is 144

Solution

Solution

Q18
15. What is 'rusting'? Describe with a labelled diagram an activity to investigate the conditions under which iron rusts.

Solution

Q19
16. What are homologous structures? Give an example. Is it necessary that homologous structures always have a common ancestor. Justify your answer.

Solution

Q20
17. Why is Tyndall effect shown by colloidal particles? State four instances of observing the Tyndall effect.

Solution

Subjects

2020

Q11 8. The chemical formula of Plaster of Paris is:

Solution

Q12 9. In a double displacement reaction such as the reaction between sodium sulphate solution and barium chloride solution: (A) exchange of atoms takes place (B) exchange of ions takes place (C) a precipitate is produced (D) an insoluble salt is produced The correct option is:

Solution

Q13 10. Baking soda is a mixture of:

Solution

Q14 11. in an ecosystem, 10% of energy available for transfer from one trophic level to the next is in the form of:

Solution

Q15 12. Soil fertility is determined by its ability to:

Solution

Q16 13. Assertion (A): In a homologous series of alcohols, the formula for the second member is C₂H₅OH and the third member is C₃H₇OH. Reason (R): The difference between the molecular masses of the two consecutive members of a homologous series is 144

Solution

Solution

Q18 15. What is 'rusting'? Describe with a labelled diagram an activity to investigate the conditions under which iron rusts.

Solution

Q19 16. What are homologous structures? Give an example. Is it necessary that homologous structures always have a common ancestor. Justify your answer.

Solution

Q20 17. Why is Tyndall effect shown by colloidal particles? State four instances of observing the Tyndall effect.

Solution

Subjects

Q11
8. The chemical formula of Plaster of Paris is:

Q12
9. In a double displacement reaction such as the reaction between sodium sulphate solution and barium chloride solution:
(A) exchange of atoms takes place
(B) exchange of ions takes place
(C) a precipitate is produced
(D) an insoluble salt is produced
The correct option is:

Q13
10. Baking soda is a mixture of:

Q14
11. in an ecosystem, 10% of energy available for transfer from one trophic level to the next is in the form of:

Q15
12. Soil fertility is determined by its ability to:

Q16
13. Assertion (A): In a homologous series of alcohols, the formula for the second member is C₂H₅OH and the third member is C₃H₇OH.
Reason (R): The difference between the molecular masses of the two consecutive members of a homologous series is 144

Q18
15. What is 'rusting'? Describe with a labelled diagram an activity to investigate the conditions under which iron rusts.

Q19
16. What are homologous structures? Give an example. Is it necessary that homologous structures always have a common ancestor. Justify your answer.

Q20
17. Why is Tyndall effect shown by colloidal particles? State four instances of observing the Tyndall effect.