HCI Post Promo Quiz 1 to 3 with ANS

Hwa Chong Institution C1 H2 Chemistry Post-Promo Quiz 1 Name: …………………………………………… Class: 12S………..… Time: 20 min Circle true/false for each statement. For each false statement, briefly comment what is wrong. Ta ke this quiz seriously as it serv es as a chec k on how well you have understood some of the concepts covered in C1. For those who get below 1 2 ma r k s , y o u p ro b a b l y h av e to fi n d ti me t o grasp, consolidate and linkup the concepts. It is always good to start early! 1 2 NaOH (aq) + Cl2 (aq) o NaCl (aq) + NaClO( a q ) The above is an example of a disproportionation reaction. True / False .......................................................................................................................... 2 The electronic configuration of Cr in chromium peroxide Cr2(O2)2 is [Ar] 3d4. True / False .......................................................................................................................... 3 The Be3Cl6 trimer is a simple covalent molecule containing four co-ordinate bonds. True / False .......................................................................................................................... 4 The geometry and shape of SbF 5 2 is octahedral and square pyramidal respectively. True / False .......................................................................................................................... 5 The 'Hc of but-1-ene and ethene are p and q kJ mol–1 respectively. Thus, the 'Hr of 2C2H4(g) Æ C4H8(g) is 2q – p kJ mol–1. True / False .......................................................................................................................... 6 The following shows step II of a reaction which consists of three steps: II N 2O2 + H2 H2O + N2O (slow) The reaction is first order with respect to both N2O2 and H2. True / False .......................................................................................................................... 7 For an overall zero order reaction, the sketch of rate vs time yields a straight line as changing the concentration of the reactants does not affect the rate. True / False .......................................................................................................................... 8 MgCl2 deviates from ideality as it forms strong ionic bonds. True / False .......................................................................................................................... 15 www.KiasuExamPaper.com 1

9 When temperature changes, the position of the equilibrium alway s shifts either to the left or right depending on the 'G. True / False .......................................................................................................................... 10 When 15 cm 3 of a gaseous hydrocarbon X w e r e b u r n e d i n 1 0 0 c m3 of oxygen, the final gaseous mixture contained 60 cm 3 of carbon dioxide and 10 cm3 of unreacted oxygen. The formula of