SS 1 Chemistry - 3rd Test
  • 1. 1. In which of the following separation methods does chemical reaction occur?
A) Chromatography
B) Sublimation
C) Distillation
D) Precipitation
  • 2. 2. The purity of a solid sample can best be determined by its :
A) Solubility
B) Conductivity
C) Melting point
D) Boiling points
  • 3. 3. The constituent of lead pigment can be separated by:
A) Filtration
B) Fractional crystallisation
C) Fractional distillation
D) Chromatography
  • 4. 4. Which of the following properties is not employed in the separation of a mixture?
A) Densities
B) Molar masses
C) Solubility
D) Boiling points
  • 5. 5. Ethanol is a product of fermentation of simple sugars. Which method is used to separate ethanol from the other products?
A) Fractional crystallisation
B) Filtration
C) Fractional distillation
D) Boiling off the ethanol
  • 6. 6. When a solid substance changes directly to a gas on heating without passing through the liquid state, the substance is said to have undergone:
A) Sublimation
B) Melting
C) Evaporation
D) Crystallisation
  • 7. 7. Fractional distillation is used to separate:
A) Liquids with different boiling points
B) Substances which differ in their solubilities in a solvent
C) Gaseous, liquid or solid impurities from a mixture
D) An insoluble substance from a soluble substance
  • 8. 8. A mixture of kerosene and water can be separated by:
A) Crystallisation
B) Sublimation
C) Separating funnel
D) Distillation
  • 9. 9. What is the mass number of an element if its atom contains 10 protons, 10 electrons, and 12 neutrons?
A) 20
B) 10
C) 32
D) 22
  • 10. 10. The electronic configuration of an atom is 2,8,8,2. The atomic number of the element is, therefore ----------:
A) 18
B) Z15
C) 10
D) 20
  • 11. 11. What is the percentage by mass of sodium in sodium hydroxide? (Na = 23, O = 16, H = 1)
A) 42.5%
B) 73.0%
C) 57.5%
D) 40.4%
  • 12. 12. What is the percentage by mass of sulphur in aluminium tetraoxosulphate (VI), Al2(SO4)_3. ( Al = 27, S = 32, O = 16)
A) 42.66%
B) 14.71%
C) 21.33%
D) 28.07%
  • 13. 13. How many electrons are in the ion F, If 19 F has neutron of 8?
A) 11
B) 27
C) 9
D) 8
  • 14. 14. Calculate the formula mass of tri lead tetraoxide Pb3O4 (Pb= 207, O = 16)
A) 586
B) 621
C) 865
D) 685
  • 15. 15. Calculate the formula mass of tetraoxosulphate (VI) acid H2SO4 (S= 32, H = 1, O = 16)
A) 98
B) 40
C) 64
D) 102
  • 16. 16. What is the molecular mass of calcium trioxonitrate (V) Ca (NO3)_2 (Ca = 40, N = 14, O = 16)
A) 164
B) 160
C) 146
D) 104
  • 17. 17. One of the following is the Avogadro's constant:
A) 6.02 × 1032
B) 6.02 × 10-23
C) 6.02 × 1023
D) 6.02 × 10-32
  • 18. 18. The relative atomic mass of any element in grams contains -------- mole of atom
A) 4
B) 2
C) 1
D) 3
  • 19. 19. The sum of the relative atomic masses of all the atoms in one molecule of the substance is referred to as ----------
A) Relative molecular mass
B) Relative avogadro's abundance
C) Relative atomic mass
D) Relative abundance
  • 20. 20. The electronic configuration of an atom is: 2, 8, 7. What element is it?
A) Potassium
B) Argon
C) Sulphur
D) Chlorine
  • 21. The shape of the p-orbitals is -------
A) Spherical
B) Longitudinal symmetrical
C) Oval
D) Dumb-bell
  • 22. --------------- states that electrons are distributed among orbitals of the same subshell singly before pairing occurs.
A) Azimuthal rule
B) Aufbau principle
C) Hund's rule
D) Pauli's principle
  • 23. The maximum number of electrons which can occupy the energy sub-level "f" is ......
A) 14
B) 8
C) 10
D) 6
  • 24. When an atom gains an electron, it becomes ........
A) Negatively charged
B) Chemically inactive
C) Complex ion
D) Cation
  • 25. The shape of the S-orbitals is .......
A) Spherically symmetrical
B) Circular
C) Dumb-bell
D) Longitudinally symmetrical
  • 26. The principal quantum number "k" takes maximum of ....
A) 6 electrons
B) 10 electrons
C) 8 electrons
D) 2 electrons
  • 27. No two electrons in the same atom can have the same values for all four quantum numbers . This is the ..........
A) Azimuthal
B) Pauli exclusive principle
C) Aufbau principle
D) Hund's rule
  • 28. The maximum number of electrons which can occupy the "s" energy sub-level is .........
A) 2 electrons
B) 8 electrons
C) 32 electrons
D) 6 electrons
  • 29. One of the following is a diatomic element.
A) Sulphur
B) Phosphorus
C) Nitrogen
D) Ozone
  • 30. The smallest particle which can participate in chemical reactions is know as......
A) Atom
B) Matter
C) Compound
D) Molecule
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