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## FIRST PUC MID-TERM EXAM OCTOBER - 2023 **Subject:** CHEMISTRY **Duration:** 3 Hrs 15 Min. **Max Marks:** 70 **Instructions:** 1. Question paper has FIVE parts. All parts are compulsory * **Part-A** carries 20 marks. Each question carries 1 mark * **Part-B** carries 10 marks. Each ques...

## FIRST PUC MID-TERM EXAM OCTOBER - 2023 **Subject:** CHEMISTRY **Duration:** 3 Hrs 15 Min. **Max Marks:** 70 **Instructions:** 1. Question paper has FIVE parts. All parts are compulsory * **Part-A** carries 20 marks. Each question carries 1 mark * **Part-B** carries 10 marks. Each question carries 2 marks * **Part-C** carries 18 marks. Each question carries 3 marks * **Part-D** carries 10 marks. Each question carries 5 marks. * **Part-E** carries 12 marks. Each question carries 3 marks 2. In Part A questions, first attempted answer will be considered for awarding marks. 3. Write balanced chemical equations and draw neat labeled diagrams and graphs wherever necessary. 4. Direct answers to the numerical problems without detailed steps and specific unit for final answer will not carry any marks. 5. Use log tables and simple calculator if necessary (use of scientific calculator is not allowed) **PART - A** **I. Select the correct option from given choices:** 1. The number of significant figure in 2.0034 * a) 1 * b) 3 * c) 4 * d) 5 2. Molality is defined as the number of moles of solute present in * a) one litre of solution * b) one litre of solvent * c) one kg of solution * d) one kg of solvent 3. Dalton proposed that * a) Matter consists of atoms which is divisible * b) Matter consists of atoms which is indivisible * c) Chemical reactions involves reorganization of atoms * d) both (b) and (c) 4. SI unit of density is * a) gL-1 * b) g mL-1 * c) gm³ * d) kg m-3 5. Mass of the positively charged particle depends upon * a) material of the electrode * b) nature of gas * c) nature of the fluorescent materials * d) nature of electric and magnetic field 6. Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region ? * a) Lymen series * b) Balmer series * c) Paschen series * d) Bracket series 7. Electronic configuration of calcium (Z = 20] atom can be written as * a) [Ne]4p2 * b) [Ne]4s² * c) [Ar]4s2 * d) [Kr]4p2 8. Mendeleev's periodic classification was based on * a) atomic number * b) number of electron * c) atomic mass * d) number of protons