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Railways PYQCBT 1 2016

RRB NTPC · Question 49

Only those metals can displace hydrogen from water, which is ______ in the reactivity chain of metals. A. Below hydrogen B. Above hydrogen C. Above or Below D. Metals cannot displace hydrogen from water.

  1. B

  2. C

  3. D

  4. A

Show answer & explanation

Answer: (A) B

Explanation

Only metals above hydrogen in the reactivity series (such as sodium, potassium and calcium) are reactive enough to displace hydrogen from water.