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11th Standard English Medium Chemistry Subject Book Back 5 Mark Questions with Solution Part - I

11th Standard

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Chemistry

Time : 00:30:00 Hrs
Total Marks : 55

    Part I

    11 x 5 = 55
  1. A Compound on analysis gave Na = 14.31% S = 9.97% H = 6.22% and 0 = 69.5%.
    Calculate the molecular formula of the compound if all the hydrogen in the compound is present in combination with oxygen as a water of crystallization. (molecular mass of the compound is 322).

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

  3. What is screening effect? Briefly give the basis for pauling's scale of electronegativity.

  4. A group-1 metal (A) which is present in common salt reacts with (B) to give compound (C) in which hydrogen is present in –1 oxidation state. (B) on reaction with a gas (C) to give universal solvent (D). The compound (D) on reacts with (A) to give (E), a strong base. Identify A, B, C, D and E. Explain the reactions.

  5. Describe briefly the biological Importance of Calcium and magnesium.

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

  7. Calculate the enthalpy change for the reaction
    Fe2O3 + 3CO ⟶ 2Fe + 3CO2 from the following data.
    2Fe +\(\frac{3}{2}\)O2 ⟶ Fe2O3; ΔH = -741 kJ
    C +\(\frac{1}{2}\)O2 ⟶ CO; ΔH = -137 kJ 
    C + O2 ⟶ CO2; ΔH = - 394.5 kJ

  8. 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 x 10–2 mol2 lit–2. In which direction will the reaction proceed to reach equilibrium ?

  9. Henry’s law constant for solubility of methane in benzene is 4.2 x 10-5 mm Hg at a particular constant temperature At this temperature.
    Calculate the solubility of methane at
    i) 750 mm Hg
    ii) 840 mm Hg

  10. Identify the compound A, B, C and D in the following series of reactions

  11. How is acid rain formed ? Explain its effect

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