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FPSC · CSS 2012

Chemistry, Paper I

100 marks · 3 hours · 4 questions
This paper Chemistry · all yearsQ. 2 · Glucose is formed according to…Q. 3 · Differentiate between a gangue and…Q. 4 · Given the reaction: Predict the…Q. 8 · Why is chlorination not the…With this paper← 20112012 →
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Part II

Q. 2
  1. (i)Glucose is formed according to the following reaction, absorbing 2840 2840 2840 kJ of heat. How much energy will be given out by combustion of 1.08 1.08 1.08 g of glucose? 6CO2(g)+6H2O(l)→C6H12O6(s)+6O2(g)6CO_2(g)+ 6H_2O(l) \rightarrow C_6H_{12}O_6(s) + 6O_2(g) [4]
  2. (ii)State and explain the relationship of ionization energy of an atom with its reactivity. [8]
  3. (iii)Explain: Why dipole movement of BF3BF_3 is Zero? [2]
  4. (iv)Why dipole movement of NH3NH_3 is greater than that NF3NF_3 ? [2]
  5. (v)Why does SO2SO_2 have dipole movement while CO2CO_2 does not? [4]
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Q. 3
  1. (i)Differentiate between a gangue and slag. Give an example of a metallurgical step where stag, flux and gangue are involved simultaneously. [6]
  2. (ii)Describe the different industrial process for preventing the metals from corrosion. [8]
  3. (iii)Draw diagram extraction of aluminum from soil. [4]
  4. (iv)Name the flux used in the extraction of Iron. [2]
(20)
Q. 4
  1. (i)Given the reaction: XeF4(g)+F(g)→XeF6(g)XeF_4(g)+ F(g) \rightarrow XeF_6(g) Predict the change in hybridization and consequent, final shape of the molecule followed in the above reaction. [4]
  2. (ii)Valence shell electron pair repulsion theory can be used to predict the shapes of molecules. Using this theory explain the shapes acquired by BF3BF_3 and CH4CH_4 . [8]
  3. (iii)Explain why HOH bond angle in H2OH_2O is slightly less than the tetrahedral angle 109.5 109.5 109.5 . [8]
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(20)
Q. 8
  1. (i)Why is chlorination not the most desirable method of disinfecting polluted water? [3]
  2. (ii)What are anthropogenic pollutants? Give two examples each of primary and secondary pollutants. [4]
  3. (iii)What are the effects of detergents on fresh water bodies? [3]
  4. (iv)Calculate the pH of 0.001 0.001 0.001 M HClHCl solution. [2]
  5. (v)How global Warming is caused? List and explain four consequences of green house effect. [8]
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(20)

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The 2012 CSS Chemistry paper set by the FPSC. Question wording only; questions marked “Not yet checked” have not been compared with the official paper yet.

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