A solution has pH less than 7 and reacts with a metal carbonate to release a gas. By which test will this gas be identified?
Answer and explanation
Correct answer: Turning limewater milky
A pH below 7 identifies the solution as acidic. Acids react with metal carbonates according to the pattern acid + carbonate → salt + water + carbon dioxide. Carbon dioxide is confirmed by passing it through limewater; insoluble calcium carbonate forms and makes the limewater milky. A glowing splint is associated with oxygen, while the litmus and white-fume choices do not identify carbon dioxide.
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What is the correct answer to this question?
Turning limewater milky
Why is this the correct answer?
A pH below 7 identifies the solution as acidic. Acids react with metal carbonates according to the pattern acid + carbonate → salt + water + carbon dioxide. Carbon dioxide is confirmed by passing it through limewater; insoluble calcium carbonate forms and makes the limewater milky. A glowing splint is associated with oxygen, while the litmus and white-fume choices do not identify carbon dioxide.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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