2022 KC Chem Prelims P1

Name: _____________________________ ( ) Class:______ This question paper consists of 11 printed pages. [Turn over CHIJ KATONG CONVENT PRELIMINARY EXAMINATIONS 2022 Secondary Four Express CHEMISTRY 6092/01 Duration: 1 hour Classes: 405 and 406 Additional Material: Optical Answer Sheet. READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid/ tape. Write your name, class and index number in the spaces provided at the top of this page and on the Optical Answer Sheet. There are forty questions on this paper. Answer all questions. For each question there are four possible answers, A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in the question booklet. A copy of the Periodic Table is printed on page 11. At the end of the examination, hand in: 1. Optical Answer Sheet; and 2. Question booklet separately. ���

CHIJ Katong Convent Prelim Exams 2022 Chemistry 6092/01 Sec 4E 2 [Turn over 1 Hydrogen chloride gas (Mr = 36.5) is released at P in the apparatus shown. The Universal Indicator paper turns red after 38 s. The experiment is repeated under the same conditions using sulfur dioxide (Mr = 64). Which shows the result for sulfur dioxide? Universal Indicator turns time for Universal Indicator to change colour/ s A blue 26 B blue 51 C red 26 D red 51 2 Substance M melts at –7.0 °C and is a brown liquid at room temperature. At which temperature(s) will pure M boil? A –77.0 °C B –7.0 °C to 7.0 °C C 48.0 °C to 65.0 °C D 59.0 °C 3 A student is asked to measure the time taken for 0.4 g of magnesium carbonate to react completely with 20.0 cm3 of dilute hydrochloric acid. Which pieces of apparatus does the student need? A electronic balance, burette, stopwatch B electronic balance, pipette, stopwatch C electronic balance, stopwatch, thermometer D stopwatch, pipette, thermometer 4 Rf values are used to identify unknown substances using paper chromatography. Which statements about Rf values are correct? 1 Rf values are always less than 1.0. 2 Rf value = distance travelled by solvent ÷ distance travelled by unknown substance. 3 The higher the Rf value, the further the unknown substance travels. 4 Rf values are not affected by the solubility of the unknown substance. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 3 and 4 only Universal Indicator paper ���

CHIJ Katong Convent Prelim Exams 2022 Chemistry 6092/01 Sec 4E 3 [Turn over 5 Which physical property is used to separate the nitrogen and o