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Samagra Shiksha, Kerala – Chemistry Exam
Instructions
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First 15 minutes is given as cool-off time. This time is to be spent for reading the question paper. |
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Answer according to the instructions. |
| • |
Answer the questions considering the score and time. |
Answer any 4 questions from 1 to 5. Each carries 1 Score.
(4×1=4)
| 1. |
H2S2O7 is a compound formed in one stage of the contact process. This is known as………………. |
(1) |
| 2. |
Which is the oxidising agent in the reaction?
H20 + Cl20 → 2H+1Cl-1
|
(1) |
| 3. |
Find the relation and complete the following:
Dobereiner : Triads
…………………. : Law of Octaves.
|
(1) |
| 4. |
Carbon atoms have the ability to combine with each other. By which name this ability is known? |
(1) |
| 5. |
Which isotope is used as the tracer for identifying the nutrient exchange in plants?
[ C-14 P-31 I-131 U-235 ]
|
(1) |
Answer any 4 questions from 6 to 10. Each carries 2 Scores.
(4×2=8)
| 6. |
Some oxides are given below
(i) Na2O (ii) NO2 (iii) CO2 (iv) MgO
| a) |
Which are the basic oxides among these? |
(1) |
| b) |
What is the name of the aqueous solution of CO2? |
(1) |
|
| 7. |
Baking soda and washing soda are compounds containing carbon.
| a) |
Write the chemical formula of baking soda. |
(1) |
| b) |
Which is the gas formed when these compounds react with acids? |
(1) |
|
Chemistry Exam Section 2
| 8. |
Complete the following equations.
| a) |
NaCl + H2SO4 → NaHSO4 + X |
(1) |
| b) |
X + NH3 → Y |
(1) |
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| 9. |
From the given statements, select those suitable for graphite.
- Is a conductor of electricity.
- Is very hard.
- Is non volatile.
- Has high thermal conductivity.
|
(2) |
| 10. |
4 HNO3 → 4 (A) + 2H2O + O2
| a) |
Identify A. |
(1) |
| b) |
Write any one property of the product A. |
(1) |
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Answer any 4 questions from 11 to 15. Each carries 3 Scores.
(4×3=12)
| 11. |
An element is represented as follows.
27
13X (Symbol is not real)
| a) |
Write the electronic configuration of the element. |
(1) |
| b) |
What is the number of electrons in the shell with highest energy? |
(1) |
| c) |
Findout the number of neutrons in this atom |
(1) |
|
| 12. |
The chemical formulae of some hydrocarbons are given below.
i) C3H4 ii) C3H6 iii) C4H8 iv) C4H6
| a) |
Which among these belong to the same homologous series? |
(1) |
| b) |
What is the general formula of this series? |
(1) |
| c) |
Write the IUPAC name of C3H8 |
(1) |
|
| 13. |
The equation of a reaction used to identify a salt is given below.
NaCl + X → AgCl + NaNO3
| a) |
Identify X. |
(1) |
| b) |
Which is the substance precipitated? |
(1) |
| m) |
What happens when ammonium hydroxide solution is added to this precipitate? |
(1) |
|
Chemistry Exam Section 3 & 4
| 14. |
Hydrogen and oxygen can be prepared by the electrolysis of water.
| a) |
How is oxygen produced industrially? |
(1) |
| b) |
What is heavy water? Write any two uses of it. |
(2) |
|
| 15. |
Ammonium sulphate [(NH4)2SO4] is a salt used as a chemical fertilizer.
| a) |
Which is the anion of this salt ? |
(1) |
| b) |
Write the name of the acid used to prepare this salt. |
(1) |
| c) |
Name a sulphate salt which is used as fungicide. |
(1) |
|
Answer any 4 questions from 16 to 20. Each carries 4 Scores.
(4×4=16)
| 16. |
Some properties of sulphuric acid are given below.
| a) |
Is a drying agent. |
(1) |
| b) |
Is a dehydrating agent. |
(1) |
| c) |
Shows oxidising property. |
(1) |
| d) |
Displaces volatile acids from their salts. |
(1) |
Write one suitable example each to illustrate these properties.
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| 17. |
The electronic configuration of some elements are given. (Symbols are not real).
Analyse them and answer the following questions.
A – 2, 8, 7
B – 2, 8, 8
C – 2, 8, 1
D – 2, 8, 3
| a) |
Which of these show the valency ‘1’? |
(1) |
| b) |
To which group does the element ‘D’ belong? |
(1) |
| c) |
Which element among these has the lowest ionisation energy? Why? |
(2) |
|
| 18. |
Ammonia is an important raw material for the production of nitrogen fertilizers.
| a) |
Which are the reactants required for the preparation of ammonia in the laboratory? |
(1) |
| b) |
Which substance is used as drying agent in the preparation of ammonia. |
(1) |
| c) |
Why ammonia is collected in an inverted gas jar? |
(1) |
| d) |
Write the identification test for ammonium salts. |
(1) |
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Chemistry Exam Page 4
| 19. |
Carbon monoxide and carbon dioxide are two compounds formed by combining carbon and oxygen.
| a) |
Which among them are used for the following.
- Production of carbogen (1)
- As a reducing agent in metallurgy. (1)
|
| b) |
Write the balanced chemical equation showing the formation of Carbonmonoxide. |
(1) |
| c) |
Write the components of water gas and producer gas. |
(1) |
|
| 20. |
Details regarding a hydrocarbon are given below.
- • There are 5 carbon atoms in the chain.
- • There is a double bond between first and second carbon atoms.
| a) |
To which category does the compound belong?
(alkane, alkene, alkyne)
|
(1) |
| b) |
Write the structural formula of this compound. |
(1) |
| c) |
Write the structural formula and IUPAC name of alicyclic compound having the same molecular formula. |
(2) |
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