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Twelfth Grade (Grade 12) Chemistry Questions

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Grade 12 Quantum Physics and the Atom
What is the correct value of Planck's constant (h), according to Planck's quantum theory?
  1. h=6.625×10-34J
  2. h=6.520×10-30C
  3. h=6.645×10-25J
  4. h=6.21×10-20C
Grade 12 Chemistry
Grade 12 Bonds and Mixing
Which of the following parameters increases with a decrease in the size of a bonding pair of electrons?
  1. Electronegativity
  2. Ionization potential
  3. Hydration energy
  4. Solvation energy
Grade 12 Thermodynamics
Grade 12 Biochemical Pathways
How do living organisms create macromolecules, organelles, cells, tissues, and complex higher-order structures?
  1. Living organisms create order locally, but the energy transformations generate waste heat that increases the entropy of the universe.
  2. Living things create order using energy from the Sun.
  3. The laws of thermodynamics do not apply to any living things.
  4. Nothing occurs spontaneously.
Grade 12 Thermodynamics
Which of the following expressions correctly characterizes an isolated system?
  1. U<0
  2. U=0
  3. U>0
  4. None of the above
Grade 12 Oxidation-Reduction Reactions
Grade 12 Stoichiometry
If W2 is the weight of solute in grams or Kgs and W1 is the weight of solvent in grams or kgs, then what is the concentration of such a solution in parts per million (ppm)?
  1. Parts per million (ppm) = W2W1+W2×106
  2. Parts per million (ppm) = [W1+W2W1]×10-3
  3. Parts per million (ppm) = W1W1+W2+102
  4. parts per million (ppm) = W2W1-W2×105
Grade 12 Atomic Structure
Grade 12 Thermodynamics
Grade 12 Acids and Bases
Which substance is not a Lewis acid?
  1. NH3
  2. BF3
  3. CaCl2
  4. AlCl3
Grade 12 Macromolecules
Grade 12 Periodic Table and Elements
Grade 12 Biochemical Pathways
Which is an example of anabolism?
  1. homeostasis
  2. hydrolysis
  3. dehydration synthesis
  4. oxidation
Grade 12 Stoichiometry
If W kg of solute is dissolved in V m3 of solution, the molarity (M) can be expressed how?
  1. (WV)=Molarity×Mol.wt.ofsolute
  2. W×V=Molarity×Mol.wt.ofsolute
  3. (WV)=MolarityMol.wt.ofsolute
  4. (W+V)=Molarity×Mol.wt.ofsolute
Grade 12 Macromolecules
Which enzyme is not created in the stomach?
  1. trypsin
  2. pepsinogen
  3. HCl
  4. gastrin
Grade 12 Organic Chemistry
Which of the following alkanes is a liquid at room temperature?
  1. C4H10
  2. C10H22
  3. C22H46
  4. C46H94
Grade 12 Macromolecules
What does the TP stand for in ATP?
  1. two phosphates
  2. three phosphates
  3. three amino acids
  4. two amino acids
Grade 12 Thermodynamics
Which of the following expressions provides the correct conversion between Joules and Calories?
  1. 1 Joule (J) = 0.239 Cal
  2. 1 Joule (J) = 0.547 Cal
  3. 1 Joule (J) = 0.345 Cal
  4. 1 Joule (J) = 0.451 Cal
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