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Question 51Asked in RRB JE CBT-1, 20 Feb 2026, Shift 1 (9:00 AM)

Which of the following compounds has a formula unit mass of 100 u?

  1. AMgO
  2. BCaCl2
  3. CNa2CO3
  4. DCaCO3
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Correct answer: (D) CaCO3

From RRB JE CBT-1 PYQ 20 Feb 2026, Shift 1 (9:00 AM)

This is question 51 of RRB JE CBT-1 PYQ 20 Feb 2026, Shift 1 (9:00 AM). 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.