Question detail
What is the test for hydrogen gas?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reactions of acids
Question
- A. Bubbling in limewater
- B. A lighted splint makes a popping sound
- C. Color change with universal indicator
- D. Formation of a white precipitate
Answer
A lighted splint makes a popping sound
Explanation
Hydrogen gas can be tested by bringing a lighted splint to it, which produces a characteristic popping sound.
Common mistake
Incorrectly balancing the equation for soluble salt preparation
Students often write the balanced symbol equation for a soluble salt preparation as 2NaCl + H2SO4 → Na2SO4 + 2HCl, treating the acid as a reactant and the salt as a product, but they forget that the acid is consumed and the salt is produced
The correct balanced symbol equation for preparing a soluble salt from an acid and an insoluble metal salt is: 2NaCl + H2SO4 → Na2SO4 + 2HCl. The acid reacts with the insoluble metal salt to produce the soluble salt (Na2SO4) and hydrogen chloride gas. Ensure the coefficients satisfy the conservation of atoms and that the acid is on the reactant side and the soluble salt on the product side.
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