Science & Technology·MCQ Practice
Chemistry — MCQ Practice
Updated 19 Oct 2026
Interactive MCQ Practice
Test your knowledge. Click “Solve” to reveal options, select your answer, then check the result. 5 questions available.
Q1medium
Hydrogen and oxygen react to form water. Which equation balances the specified reaction without changing the product?
Q2medium
Sodium chloride conducts electricity when molten but not as an ordinary solid crystal. Which explanation best accounts for the difference?
Q3medium
In CuO + H₂ → Cu + H₂O, which assignment is correct?
Q4medium
An iron nail is placed in copper sulphate solution and copper is deposited. Which conclusion is supported by this standard displacement experiment?
Q5medium
A proposal claims that a new protective coating will eliminate infrastructure corrosion costs. Which additional consideration most directly tests the practical claim?