SS1CHEM3RDTERM.docx

**CHEMISTRY SS1** **3^RD^ TERM 2023/2024 EXAMINATION** **SS1** 1. P~1~V~1~ = P~2~V~2~ supports (a) Charles' law (b) Boyle's law (c) Graham's law (d) Avogadro's law 2. From the ideal gas equation, PV = nRT, the unit of n is (a) atm dm^3^ (b)^ ^atm dm^3^ K^-1^ (c) moles (d) K^-1 ^mole^-1...

**CHEMISTRY SS1** **3^RD^ TERM 2023/2024 EXAMINATION** **SS1** 1. P~1~V~1~ = P~2~V~2~ supports (a) Charles' law (b) Boyle's law (c) Graham's law (d) Avogadro's law 2. From the ideal gas equation, PV = nRT, the unit of n is (a) atm dm^3^ (b)^ ^atm dm^3^ K^-1^ (c) moles (d) K^-1 ^mole^-1^ 3. Presence of Sodium Chloride in ice will (a) decrease or lower the boiling point of sodium chloride (b) increase the melting point of sodium chloride (c) make sodium chloride impure (d) lower the freezing point of sodium chloride 4. The phenomenon whereby the atmospheric pressure equals the saturated vapour pressure is called (a) freezing (b) latent heat (c) boiling (d) normal pressure 5. The escape of molecules with more than average kinetic energy of the molecules is called (a) melting (b) freezing (c) evaporation (d) efflorescence 6. The following acids are monobasic except (a) HNO~2~ (b) HBr (c) HOCl (d) H~2~SO~3~ 7. Which of the following ions is acidic? (a) K^+^ (b) NO~3~^-^ (c) S^2-^ (d) H~3~O^+^ 8. The number of hydroxonium ions produced by one molecule of an acid in aqueous solution is its. (a) acidity (b) basicity (c) Concentration. (d) PH. 9. The basicity of ethanoic acid C~2~H~4~O~2~ is: (a) 0 (b) 1 (c) 2 (d) 3. 10. A solution with PH 7 is (a) Acidic (b) dilute (c) neutral. (d) saturate(d) 11. The two types of bonds that exist in H~3~O^+^ are (a). covalent and ionic (b) co-ordinate covalent and covalent. (c) metallic and ionic (d). polar covalent and metallic. 12. How many moles of hydrogen ions are there in 50cm^3^ of 0.20moldm^-3^ H~2~SO~4~? (a) 0.01 (b) 0.02 (c) 0.10 (d. 0.20 13. Which PH value indicates a basic solution? (a) -1 (b) 3 (c) 9 (d) 7. 14. All common gases are dried using P~2~O~5~ except (a). NO~2~ (b) NH~3~ (c) SO~2~ (d) H~2~S. 15. The existence of an element in two or more form in the same physical state is known as a) allotropy (b) isotopy (c) isomerism (d) hybridization. 16. Which of the following correctly describes the structure of graphite (a) ionic lattice (b) network structure (c) molecular solid (d) layer lattice. 17. Animal charcoal differs from wood charcoal in that it (a) has a dark colour (b) has a high carbon content (c) is a good absorbent (d) is rich in phosphate content. 18. Carbon is often deposited in the exhaust pipe of cars because of the (a) dehydrogenation of petrol (b) incomplete combustion of petrol (c) presence of additives in petrol (d) presence of carbon in petrol. 19. Graphite and diamond are allotropes of Carbon but only graphite conducts electricity because graphite (a).is tetrahedral while diamond is octahedral in shape (b) contains mobile ions but diamond does not (c).is soft but diamond is hard (d) contains free electrons but diamond does not. 20. Diamond does not conduct electricity because it (a) has no free valence electrons (b).is a giant molecule (c) contains no bonded electrons (d) is a solid at room temperature. 21. The use of diamond in abrasives is due to its (a) High melting point (b) Durability (c) Metallic lustre (d) Hardness. 22. Where else is CO~2~ found in free state apart from the atmosphere? (a) In carbonated trees. (b) Dissolved form in water. (c) In corals. (d) In limestone region. 23. What is the PH of a solution whose H^+.^ concentration is 3.0 x 10^-5^moldm^-3^? (a) 2.12 (b) 3.00 (c) 4.45 (d) 4.52. 24. What volume of 0.5moldm^-3^ H~2~SO~4~ in cm^3^ will exactly neutralize 20cm^3^ of 0.1moldm^-3^ NaOH solution? (a).2.0 (b) 5.0 (c) 6.8 (d) 8.0. 25. How many atoms are contained in 2g of Hydrogen gas (H=1) (a) 6.02 x 10^23^ atoms (b) 6.02 x 10^23^ molecules (c) 12.04 x 10^23^ atoms (d) 12.04 x 10^23^ molecules 26. Water exists as a solid, liquid and gas respectively because (a) water is colourless (b) water is electrovalent (c) water in any state possesses a certain degree of motion in molecules (d) water is molecular 27. Which of the three states of matter has no fixed shape, no fixed volume and less dense (a) Gas (b) Liquid (c) Solid (d) Crystal 28. A solution of PH 7 is (a) acidic (b) concentrated (c) dilute (d) neutral. 29. How many molecules are there in 14g of Nitrogen gas at s.t.p? \[N=14, N~A~=6.0 x 10^23^\] 30. It is dangerous to stay in a badly ventilated room which has a charcoal fire because of the presence of 31. The liquid product of the destructive distillation of coal is (a) ammoniacal liquor (b) coal fume (c) dyestuff (d) coal plasma 32. Fractional distillation involves the following processes (a) Boiling (b) Boiling and condensation (c) Boiling, evaporation and condensation. (d) Condensation and collection. 33. Which is the odd one out of the following (a). petroleum ether, petroleum gases, kerosene (b) Gas oil and diesel lubricating oil (c) Petroleum ether and bitumen (d) Haematite and asphalt. 34. Which of the petrol samples are likely to cause knocking? (a) octane (b) 2,2,3,3-tetramethyl butane (c) 2,2,3-trimethyl pentane (d) 2,2,3-trimethyl pentane. 35. Nigeria earns money from (a) petroleum gas and liquids only (b) petroleum liquids and solids only (c) petroleum liquids like petrol and kerosene oil (d) petroleum gases, liquids and solids. 36. The octane of a fuel whose performance is the same as that of a mixture of 55g of 2,2,4 -- tri methyl pentane and 45g of n -- heptane is (a) 45 (b) 55 (c) 80 (d) 100 37. An element belongs to a period in the periodic table because of (a) the number of electrons in its outer-most shell. (b) the shell number. (c) the electronic configuration in the azimuthal quantum number. (d) the size of the atom. 38. Which of the following statements best explains cracking? It is a process (a) in which an alkene adds on itself repeatedly to form long chain polymers (b) in which large hydrocarbon molecules are broken into smaller units. (c) for measuring the octane number of petrol (d) in which carbon Chain results in a zig-zag arrangement 39. Which of the following hydrocarbon is not likely to be present in petrol? (a) C~14~H~30~ (b) C~10~H~22~ (c) C~9~H~20~(d) C~5~H~12~ 40. Octane number is highest in petrol containing a high proportion of (a) heptane(b) octane (c) 2 -- methyl penthane (d) 2,2,4- trimethyl penthene 41. Determine the maximum number of electrons that can occupies the principal energy level N of the atom (a) 18 (b) 8 (c) 24 (d) 32 42. The oxidation number of Sulphur in H~2~SO~4~ is (a) 1 (b) 2 (c) 4 (d) 6 43. Trioxonitrate (v) acid is written as (a) H~2~NO~3~ (b) HNO~3~ (c) H~2~NO~4~ (d) HNO~4~ 44. The major reason why chemical reaction occurs among elements is that they have the tendency to (a) attain the nearest noble gas structure. (b) become a metal. (c) become a non-metal (d) become any noble element. 45. In Electrovalency most metallic atoms with few valence electrons give out electrons because (a) they are unstable. (b) they require less energy to give away these electrons. (c) they require more energy to give away these electrons. (d) they need non-metals to operate. 46. If the initial volume was 500ml at a pressure of 760atm, when the volume is compressed to 450ml, what is the pressure? (a) 844atm (b) 842atm (c) 944atm (d) 698atm 47. The Arrangement of ions in a regular pattern in a solid crystal is called (a) Configuration. (b) atomic Structure (c) lattice (d) buffer. 48. If force is applied to an electrovalent crystal, (a) the shape will be deformed (b) the shape will not be deformed (c) the crystal will not be fractured (d) the shape and the crystal structure will be deformed. 49. Atomicity of Ozone is (a) 1 (b) 2 (c) 3 (d) 4 50. A molecule is the smallest particle of (a) a matter that can exist in free state. (b) an element that can exist in free state. (c) a radical that can exist in free state. (d) a lattice that can exist in free state. 51. 3NH~3~ is (a) three moles of ammonium. (b) three moles of ammonia (c) six moles of ammonia (d) Six moles of ammonium. 52. What is the electronic configuration of an element X atomic number 9 mass number 19 (a) 2,7 (b) 2,8 (c) 2,8,8,1 (c) 2,8,8 (d) 2,6,1 53. The bond type in a diatomic nitrogen gas is (a) double covalent bond (b) triple covalent bond (c) Single covalent bond (d) double electrovalent bond 54. The bond type between copper(ii) ion and water molecules is (a) electrovalent bond (b) covalent bond Dative covalent bond (d) hydrogen bond 55. The bond between two iodine molecules is (a) Co-ordinate bond (b) electrovalent bond (c) ionic bond (d) Van der Waal \'s forces. 56. Bonds between a highly electronegative atom and a hydrogen from another molecule is called (a) hydrogen bond (b) covalent bond (c) inter molecular forces (d) ligand 57. Rare gases are stable because they (a) are monoatomic (b) are volatile gases. (c) form ions easily. (d) have duplet or octet electronic configurations in the outermost shells of their atoms. 58. Which of these is the same in isotopes of an element? (a) Mass number (b) Number of protons and neutrons (c) Relative atomic Mass (d) Atomic number 59. A sample of gas occupies 400.0cm^3^ at 25^o^C and 1 bar pressure. What volume will it occupy at 200^o^C at the same P? (a) 634.8cm^3^ (b) 734.8cm^3^ (c) 234.8cm^3^ (d) 643.3cm^3^ 60. Atom is (a) the Smallest part of a substance that can take part in a chemical change (b) the smallest part of a compound that can take part in a chemical change (c) the smallest part of an element which can take part in a chemical change (d) the smallest part of a lattice which can take part in a chemical change. **THEORY** **Instruction: Answer all** 1\. 14g of hydrated H~2~C~2~O~4~.xH~2~O was heated to give an anhydrous salt weighing 9.99g. (a). Calculate the value of x. (b). Give the formula of the hydrated salt. (c). Calculate the % of water of crystallization. \(d) State for characteristics of salts 2(a) State the bonding in: i\. H~2~ ii. NaCl iii. H~2~O \(b) Balance the equation: I Na~(s)~ + O~2(g)~ \-\-\-\-\-\-\-\--\> Na~2~O~(s)~ II\. NH~3(g).~ + O~2(g)~ \-\-\-\-\-\-\-\--\> H~2~O~(g)~ + N~2(g)~ 3\. A solution contains 0.02M H~2~SO~4.~ Calculate a. b. c. d. 4(a) State one property each of Solid, liquid and gas \(b) Identify a, b, c, d, e, and f in the diagram below. G S L