IPUC Chemistry Practical Exam PDF

IPUC CHEMISTRY PRACTICAL TIME: 2Hrs 1) Marks distribution: S.No Experiment Marks Determination of PH values for different samples by using 1 Universal indicator...

IPUC CHEMISTRY PRACTICAL TIME: 2Hrs 1) Marks distribution: S.No Experiment Marks Determination of PH values for different samples by using 1 Universal indicator 5 Systematic qualitative analysis of simple inorganic 2 salt(Determination of acid radical ) 5 3 Titration NaOH Vs Oxalic acid 10 4 Record(certified) 6 5 VIVA 4 Total 30 Q1) Determination of PH values for different samples by using Universal indicator; (5m) Sample PH value Acidic/Basic/Neutral Sample-1 Sample-2 Sample-3 Sample-4 Sample-5 Q2)Simple inorganic salt analysis; (5m) 1) Preliminary test (any2correct).. (1m) 2) Detection of Acid radical (mention correct group number and radical name)……(2m) 3) Confirmation of Acid radical and Result (mention correct group number and radical name)……(2m) Q3) Determine the concentration of NaOH by using 0.1M Oxalic acid by volumetric analysis (10m) 1) For Titration performance….. (3m) 2) Tabular column with readings (should get CBR)….(4m) 3) Formula and explain the terms……(1m) 4) Calculation……(1m) 5) Result with units…(1m) 1  NOTE:  Students must be attend lab exam with certified record which is neatly wrapped.  Student should get concordant burette reading in Titration (CBR) and write it below the tabular column.  Student shall write two confirmations for acid radical. [if any confirmation will wrong then get marks in other test]  Must follow the order of tests in salt analysis to avoid an incorrect acid radical report.  Must follow the examination instructions. **************** VIVA Questions: 1. Why is a Bunsen burner provided with air holes? A) To regulate the supply of air 2. What type of flame would you use for general heating purpose? A) A non luminous oxidizing flame is used for general heating as it gives maximum heat due to complete combustion of hydrocarbons. 3. Why is a broad flame used for bending a glass tube? A) If narrow flame is used,folds are formed at the bend. 4. Why should the tube be rotated while heating? A) The tube be rotated while heating in order to ensure uniform heating from all sides. 5. Define the term 'crystallisation'. Why is crystallisation done? 2  A) Conversion of a substance into well defined geometrical shape is called Crystallisation. Crystallisation enables to prepare a substance in state of highest purity. 6. What is solubility? A) It is the amount of the solute which when dissolved in 100g of the solvent provides a saturated solution. 7. What is meant by the term, 'water of crystallisation'? A) Water of crystallization is the definite number of water molecules present in one formula unit of the compound. 8. Explain the term - saturated solution? A) A solution in which no more of solute can be dissolved at a particular temperature is known as saturated solution. 9. Why is solution not heated to dryness to get crystals? A) Heating the solution to dryness will not remove soluble impurities and crystals of very poor quality are obtained. 10. What are the characteristics of crystals? A) Crystals have well defined geometry and shape. 3 11. Define pH ? What does pH of a solution signify? A) It is defined as the negative logarithm of hydronium ion concentration in moles per litre. pH = - log[H3O +]. It signifies that the H3O + ion concentration in moles per litre. 12. What is the effect of dilution on pH of (a) an acidic solution. A) pH of an acidic solution increases on dilution. (b) a basic solution. A) pH of an basic solution decreases on dilution 13. What is law of mass action? A) At constant temperature ,the rate of a reaction is directly proportional to the product of the molar concentration of the reacting substances. 14. What is chemical equilibrium? A) In a chemical reaction when the rate of the forward reaction becomes equal to the rate of the backward reaction, that state is known as chemical equilibrium. 15. What will be the effect of increasing the temperature of the reaction mixture at equilibrium? A) On increasing the temperature, the equilibrium shifts in favour of endothermic direction. **************** With best wishes from Department of Chemistry 4