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Question 20Asked in RRB JE CBT-1, 18 Dec 2024, Shift 3 (4:30 PM)

When hydrogen gas is passed through heated black copper (II) oxide, it:

  1. Areduces to form bluish copper solution
  2. Boxidises to form bluish copper solution
  3. Coxidises to form brownish copper metal
  4. Dreduces to form brownish copper metal
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Correct answer: (D) reduces to form brownish copper metal

From RRB JE CBT-1 PYQ 18 Dec 2024, Shift 3 (4:30 PM)

This is question 20 of RRB JE CBT-1 PYQ 18 Dec 2024, Shift 3 (4:30 PM). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.