ASRJC_H2_Chem_2022_Prelim_P1_Soln

ASRJC JC2 PRELIMS 2022 9729/01/H2 [Turn over ANDERSON SERANGOON JUNIOR COLLEGE 2022 JC 2 PRELIMINARY EXAMINATION SOLUTIONS NAME:______________________________ ( ) CLASS: 22 /____ CHEMISTRY 9729/01 Paper 1 Multiple Choice 21 September 2022 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Please look through the marks scheme and understand the concepts tested in each question. Do pay attention as the tutor go through selected questions in lecture. If you still have further questions, you may check with your tutor at your own time. Be proactive in asking questions. If you do not ask now, then when? Remember the power of tiny gains and be a little better every day!

2 ASRJC JC2 PRELIMS 2022 9729/01/H2 1 Ans: D Statement A is incorrect. Electrons has a larger e/m ratio and hence will be deflected to a larger extent than protons. Statement C is incorrect. Electron beam should be deflected towards the positively charged plate. Statement B is incorrect and D is correct. Proton beam travels in a parabolic path towards the negatively charged plate. 2 Ans: C There is a large increase in the 7th to 8th ionisation energy. This means that the 8 th electron is removed from the inner principal quantum shell and element D is from Group 17. Its valence configuration will be ns 2np5. Hence the 5 th electron is from the p subshell and 6 th electron is from the s subshell. While it is possible that D is fluorine (i.e. in Period 2), it cannot be conclusively inferred from the data given as element D may have more than 9 electrons. However, if the 10th I.E. is given, we can conclude that D is not fluorine in Period 2. 3 Ans: D 1: C-Cl bond is polar and there are 2 C l bonds in molecule I, thus it is more polar than molecule II. 2: The dipole moments associated with the polar C -Cl bond is canceled out in the trans molecule. Thus, the cis isomer is more polar. 3: The dipole moments associated with the polar C -Cl bond is canceled out in the trans molecule. Thus, molecule I is more polar. 4: C-F bond is more polar than C-Cl bond. Thus, molecule I is more polar. 4 Ans: A E has simple molecular structure with low m.p because little amount of energy is needed to overcome the weak intermolecular forces of attraction. It is unable to conduct electricity in any state due to absence of mobile charge carriers. F has giant ionic lattice structure with high m.p because large amount of energy is needed to overcome the strong electrostatic forces of attraction between the oppositely charged ions. It conducts electricity in aqueous and molten state due to the presence of mobile ions. G has giant metallic lattice structure with high m.p because large amount of energy is needed to overcome the strong metallic bonds. It conducts electricity in solid and molten state due to the presence of delocalised electrons. H is