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Materials : Metals and Non-Metals — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceMaterials : Metals and Non-Metals1 Mark
MCQ
Substance $X$ reacts with dilute $HCI$ violently, $V$ reacts slowly while $Z$ does not react at all. $X, Y$ and $Z$ could be respectively.
  • A
    $Cu, Al, Fe.$
  • B
    $Al, Na, Cu.$
  • C
    $Na, Cu, Fe.$
  • ✓
    $K, Al, Cu.$
✓

Answer

Correct option: D.
$K, Al, Cu.$
More reactive metals like $Na, K$ react violently with dilute acids. Reaction is slower for less reactive metals and, copper, silver and gold do not react with acids.

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