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Science (086) — AI-generated practice question

AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.

Q1. [1] straightforward initial-understanding
Which of the following correctly describes what happens when dilute hydrochloric acid is added to copper? (A) Hydrogen gas is evolved and a copper chloride solution forms. (B) No reaction takes place. (C) Copper displaces hydrogen and forms copper oxide. (D) Carbon dioxide gas is evolved.
  1. A Hydrogen gas is evolved and a copper chloride solution forms.
  2. B No reaction takes place.
  3. C Copper displaces hydrogen and forms copper oxide.
  4. D Carbon dioxide gas is evolved.
Generated by claude-sonnet-4-6 · 2026-06-26 01:03 · grounding rag
Model Answer

(B) No reaction takes place.

Copper is less reactive than hydrogen in the activity series, so it cannot displace hydrogen from dilute HCl; hence no reaction occurs.

Explanation

Examiners expect students to apply the reactivity series: only metals above hydrogen (e.g., Fe, Zn, Mg) can displace hydrogen from dilute acids. Copper lies below hydrogen in the series, so it does not react with dilute HCl. This is a standard application question from Chapter 1 (Chemical Reactions and Equations).

Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.