GYSS 2024 4E Chemistry Prelims Paper 1_QP_Final

2 1 The diagram shows the apparatus used to obtain a gas sample from a mixture of ammonia, hydrogen chloride, sulfur dioxide and nitrogen. Which of the following gas(es) would be present in the gas sample? A hydrogen chloride and sulfur dioxide only B sulfur dioxide and nitrogen only C ammonia only D nitrogen only 2 Two students performed paper chromatography to identify the dyes present in a food colouring sample. The two chromatograms, P and Q, are shown. What is a possible explanation for the difference in the two chromatograms? A A more concentrated sample was used in chromatogram P. B Impurities are present in the sample used for chromatogram Q. C The experiment was performed for a shorter period of time for chromatogram Q. D The solvents used for chromatogram P and Q are different. acidified potassium manganate(VII) concentrated sulfuric acid water gas sample P Q solvent front start line

3 3 The information of two substances, E and F are given. Four substances, which could be E and F, are given below. Which row shows substances E and F? substance E F arrangement of particles disorderly and randomly close and not orderly movement of particles moving in all directions at high speed sliding around randomly substance description 1 water at 150 ºC 2 magnesium at 200 ºC 3 ethanol at 40 ºC 4 potassium oxide at 10 ºC E F A 1 2 B 1 3 C 2 1 D 4 3 4 The following apparatus is set up, using different gases in the two inverted beakers. Which pair of gases would cause an upward movement of the water level at X? gas 1 gas 2 A chlorine fluorine B chlorine hydrogen C helium fluorine D helium hydrogen X porous pot air gas 1 water air porous pot gas 2 beaker

4 5 The nucleon number and number of electrons of elements M and N are shown. Which statement about M and N is correct? element nucleon number number of electrons M 15 7 N 24 12 A An atom of M has more neutrons than an atom of N. B M and N will combine to form a compound with a molecular mass of 102. C M is a stronger reducing agent than N. D N is in the same period in the Periodic Table as M. 6 Zircaloy-4 is an alloy comprising 98.0% zirconium, 1.5% tin and 0.5% iron. It is often used to make the parts of nuclear power plants and aircrafts. Which of the following statements is true about zircaloy-4? A It is resistant to corrosion as the zirconium and tin atoms form a protective layer over the iron. B It is strong as the tin and iron atoms form strong bonds with the zirconium atoms. C It conducts electricity as the metal cations can act as mobile charge carriers when a potential difference is applied. D It is hard as the atoms have different sizes and cannot slide over each other easily. 7 The table shows the physical proper