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CBSE Class 11 Pre Board 2020 : Chemistry (Delhi Public School (DPS), Jammu)

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DELHI PUBLIC SCHOOL,JAMMU ASSIGNMENT FINAL EXAMINATION (2019-20) CLASS: 11th SUBJECT: CHEMISTRY SECTION A Questions 1 to 5 are passage questions: The solubility of a crystalline compound in water is influenced by two factors i.e., hydration enthalpy and lattice enthalpy. Lattice enthalpy is needed to separate the ions of the crystal lattice. At the same time, energy is released when the ions are dissolved in water. The resultant of theses two opposite forces decide the solubility of the compound. Q.1 Q.2 Q.3 Q.4 Q.5 Name the group-1 hydroxide which is highly water soluble. Name the group-2 hydroxide which is highly water soluble. Name the group-1 sulphate which is highly water soluble. Name the group-2 sulphate which is highly water soluble. Li salts are water insoluble. Why? Questions 6 to 10 are one word answers: Q.6 Define pH. Q.7 What is meant by the term ionic product of water . Q.8 What will happen to the pH of water on increasing the temperature? Q.9 Which is the most stable carbocation? Q.10 What is meant by the term fractional distillation ? Questions 11 to 15 are multiple choice questions: Q.11 Oxidation number of fluorine in OF2 is: (1) +1 (2) +2 (3) -1 (4) -2 Q.12 14 A reducing agent is a substance which can: a) accept electrons b) donate electrons c) accept protons d) denote protons Q.13 For the reaction H2(g) + I2(g) 2HI(g), the standard free energy is G > 0. The equilibrium constant would be: a) K=0 b) K >1 c) K=1 d) K<1 Q.14 Alkali metals dissolve in liquid NH3 then which of the following observations is not true:

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