Some Basic Concepts In Chemistry Mock Tests
38 questions available
Some Basic Concepts In Chemistry Mock Test 1
Questions:
30
Some Basic Concepts In Chemistry Mock Test 2
Questions:
8
Sample Questions
2.4 g of magnesium (atomic mass = 24 g/mol) is burnt in excess oxygen. The mass of magnesium oxide formed is:
The number of significant figures in 0.002503 is:
A compound contains 40% carbon, 6.67% hydrogen, and 53.33% oxygen by mass. Its molecular mass is 90 g/mol. What is its molecular formula? (C = 12, H = 1, O = 16)
10 g of CaCO₃ on heating gives 7 g of CaO. The percentage yield of CaO is: (atomic masses: Ca = 40, C = 12, O = 16)
In the reaction N₂ + 3H₂ → 2NH₃, 28 g of N₂ reacts with 6 g of H₂. Which is the limiting reagent? (Atomic mass: N = 14, H = 1)
Which of the following species has the highest electron gain enthalpy?
2.8 g of iron reacts with 2.4 g of sulfur to form FeS. What is the limiting reagent? (Fe = 56 g/mol, S = 32 g/mol)
At constant temperature, if the volume of a gas is halved, the pressure becomes:
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