Name of the organization: The National Institute of Open Schooling (nios.ac.in)
Type of Announcement : Model Question Paper for Chemistry
Home Page : http://www.nios.ac.in/
SAMPLE QUESTION PAPER
CHEMISTRY
Time : 3 hrs.
Maximum Marks : 80
Note :
(i) All questions in Section A are compulsory
(ii) Attempt only one out of three options in Section B, i.e., attempt either Part I or Part II or Part III in Section B.
(iii) marks for each question are indicated against it.
(iv) Use log tables if necessary.
Section A :
1. What are the SI units of mass? (1)
2. How may moles of hydrogen gas are there in 11.2 liters of hydrogen gas at STP? (1)
3. Name a lyophilic colloid. (1)
4. What do the molecular solids have low melting points? (1)
5. Define enthalpy of formation. (1)
6. Why is lithium most difficult to be reduced? (1)
7. Define an isolated system. (1)
8. What is Le Chatelier’s principle. (1)
9. Name the components of Bordeaux mixture. (1)
10. State two characteristic properties of transition elements which are different from group I elements. (1)
11. Give the structural formula of the product obtained on mono bromination of phenol. (1)
13. Derive the SI units for the following quantities (2)
i) Force
ii) Pressure
14. 10 g of a non-volatile solute in 100g of benzene raises its bioling point by 1 K. What is the molecular mass of the solute? Kf for benzene = 2.53 K g-1mol-1 (2)
15. Glucose is formed according to the following reaction :
6CO2 (g) + 6 H2O (1) ® C6H12O6 (s) + 6O2 (g) absorbing 2840 kJ of heat. How much energy will be given out by combustion of 1.08g of glucose? (2)
16. State Heisenberg’s principle of uncertainty and give its mathematical relationship. (2)
17. The solubility of calcium sulphate in water is 4.9×10-3M at 250C. Calculate the value of Ksp for CaSO4 at this temperature
Given : CaSO4 (s) Ca2+ (aq) + SO4 2-(aq) (2)
18. Explain the variation of ionization energy down the group in a periodic table. State the relationship of ionization energy of an atom with its reactivity. (2)
19. Paramagnetism of a substance can be calculated in terms of magnetic moment in Bohr Magneton (BM) by using the expression :
µ = [n (n+2)]½
The atomic number of chromium is 24. In which oxidation state the magnetic moment of its (Chromium) ion will be maximum and in which it will be zero? (n is the number of unpaired electrons). (2)
20 Write briefly about “Aldol condensation’ and give an example. (2)
21. Differentiate between a gangue and slag. Give an example of a metallurgical step where stag, flux and gangue are involved simultaneously. (2)
22. Define the term isomerism. Give one example of each of the two types of isomerism. (2)
OPTION 1 (Agricultural Chemistry)
1. Define composting. 1 mark
2. List two points of differences between micro nutrients and macro nutrients. 1 mark
3. What can be done to overcome the dangerous effects of modern agriculture? 1 mark
4. Why do we need biological nitrogen fixation? 2 mark
5. Define soil. List four major soil groups of India. 2 mark
6. Give the classification of pesticides based on target organisms. 3 mark
PRT II : OPTION 2 (Bio Chemistry)
1. Give two examples of polysaccharides. 1 mark
2. Write two properties which are common to chemical catalysts and enzymes. 1 mark
3. List two differences between enzymes and catalysts. 1 mark
4. Define lipids. List 3 different types of lipids. 2 mark
5. Why are fats a better source of energy than glucose? 2 mark
6. List 3 functions of DNA. 3 mark
PRT II : OPTION 3 (Environmental Chemistry)
1. Define water pollution. 1 mark
2. Why is chlorination not the most desirable method of disinfecting polluted water? 1 mark
3. What are the effects of detergents on fresh water bodies? 1 mark
4. What are anthropogenic pollutants?. Give two examples each of primary and secondary pollutants. 2 mark
5. Why is it impossible for a nuclear reactor to blow up like a bomb? Explain. 2 mark
6. How is global warming caused? List four consequences of green house effect. 3 mark
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