Basic Principles and Laboratory Operations — DU B.Sc. (Prog.) Applied Physical Science with Analytical Methods in Chemistry & Biochemistry Previous Year Question Papers

: Basic principles & Laboratory operations : B.Sc. (P) Analytical chemistry 2. AnswerFour questions in all. 1. (a) What is derive unit? Derive the sl unit of acceleration. (b) (c) (d) Define the fundamental SI units of (i) Length (ii) Time Differentiate between uncertainty and errors. What is the first step of chemical analysis?I (a) Describe the preparation of 500 mL, 0.5M CuS04 in a volumetric flask. (5) (b) Explain. the principle of operation of electronic balance. (c) Define (i) w/v % (ii) ppb (iii) w/w %. (5) 3. (a) (b) What is meantby accuracy? What is the least count of 10 ml pipette? Measurement is taken with the help of a screw gauge having least count 0.01 nm. Calculate the maximum possible uncertainty in the measurement. (c) How does one can reduce the systematic errors? (5) 4. (a) What are the critical functions of laboratory note book? (6) (b) A burette reading was reported as 11.45 ± ,0.02. Find the relative unc ert ainty. (3 ) (c) Analyses of sample of iron ore gave the following percentage values for the iron content 5..08, 5.21, 5.12, 5.09, 5.16, 5.14, 5.07, 5.14, 5.18, 5.11. Calculate the mean, standard deviation and coefficient of variation for the values. (6) 5. (a) List the steps in a chemical analysis. Explain the steps involved. (5) (b) Find the significant figures in the following : (c) Round off the number 43.`6-0235 6. (a) What are the unit of(i) Normality (ii) Molarity (iii) Molality (iv) Molar mass. (b) A student measured the volume of a liqui`ds as given below : Calculate the standard deviation. (c) What is coefficient of variation? Give its importance.