New Exam Prep
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New Exam Prep
Sample questions with model answers
Every question in the paper gets a full exam-length answer in the app — organised by marks, the way a topper writes it.
How many water molecules are associated with the formula unit of Epsom salt?
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7
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Washing soda on standing in air effloresces. How many water molecules are lost per formula unit of washing soda?
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10
The full exam-length answer is in the app.
Calculate the magnitude of heat of solution of NaCl from the following data: Hydration energy of $Na^{\oplus} = -389kJ mol^{-1}$, Hydration energy of $Cl^{\ominus} = -382kJ mol^{-1}$, Lattice energy of $NaCl = +776kJ mol^{-1}$.
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5
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The number of water molecules in gypsum, dead burnt plaster and plaster of Paris, respectively are X, Y and Z. Then X+Y+2Z = ________.
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15
The full exam-length answer is in the app.
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