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#### Full Portion Five Marks Question Paper

11th Standard

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Chemistry

Time : 02:00:00 Hrs
Total Marks : 100
20 x 5 = 100
1. The reaction between aluminum and ferric oxide can generate temperatures up to 3273 K and is used in welding metals. (Atomic mass of AC = 27 u atomic mass of O = 16 u )
2Al + Fe2O3 $\longrightarrow$ Al2O3 + 2Fe;  If in this process, 324 g of aluminum is allowed to react with 1.12 kg of ferric oxide
i) Calculate the mass of Al2O3 formed
ii) How much of the excess reagent is left at the end of the reaction?

2. Explain the steps involved in ion-electron method for balancing redox reaction.

3. What is the de Broglie wavelength (in cm) of a 160g cricket ball travelling at 140 Km hr-1.

4. What is the de Broglie wave length of an electron, which is accelerated from the rest, through a potential difference of 100V?

5. What are the factors influencing ionization enthalpy.

6. Describe briefly the biological Importance of Calcium and magnesium

7. Write the Van der Waals equation for a real gas. Explain the correction term for pressure and volume.

8. A gas has a volume of 6.85 dm3 at a pressure of 0.650 atm. When pressure is Increased by 0.5 atm. what will be its volume?

9. Explain Andrew's isotherm of carbon dioxide.

10. Calculate the standard heat of formation of propane, if its heat of combustion is -2220.2 kJ mol-1. the heats of formation of CO2(g) and H2O(l) are -393.5 and -285.8 kJ mol-1 respectively

11. Distinguish between reversible and irreversible process

12. 1 mol of CH4, 1 mole of CS2 and 2 mol of H2S are 2 mol of H2 are mixed in a 500 ml flask. The equilibrium constant for the reaction KC = 4 × 10–2 mol2 lit–2. In which direction will the reaction proceed to reach equilibrium?

13. Calculate the volume of 1.5N H2SO4 is completely neturalized by 35.8 mL of
(a) 2.5N NaOH
(b) 2.5M NaOH
(c) 2.5N Ba(OH)2
(d) 2.5M Ba(OH)2

14. Define ionic bond. Give suitable examples and distinguish between covalent bond and ionic bond.

15. 0.26g of an organic compound gave 0.039 g of water and 0.245 g of carbon dioxide on combustion. Calculate the percentage of C & H.

16. Discuss the inter conversions observed in the following functional groups.
(i) Alcohol
(ii) Alkyhalide
(iii) Alkyl cyanide

17. Explain the structure of benzene.

18. Starting from methyl magnesium iodide, how would you prepare
(i) Ethyl methyl ether
(ii) methyl cyanide
(iii) methane

19. (i) How does pollutants vary from contaminants?
(ii) Classify the pollutants on the following basis & give examples.
Depending on their physical state