MCQ practice · SSC Chemistry Board questions · Chapter 6: Concept of Mole and Chemical Counting
What is the atomic mass of Co?
Think it through first, then pick an option.
- a 68
- b 58
- c 29
- d 27
Answer and explanation
Correct answer: b 58
The periodic table gives Co an atomic mass of 58.
Why the other options are wrong
- a 68: Not 68; Co (element 27) has atomic mass 58.
- c 29: 29 is the atomic number of Cu; the atomic mass of Co is 58.
- d 27: 27 is the atomic number of Co, not its mass; the mass is 58.
More board questions on this topic
- How many atoms are there in magnesium phosphate?
- How many atoms are there in one molecule of sodium lauryl sulphate?
- How many atoms are there in one molecule of potassium dichromate?
- How many atoms are there in one molecule of aluminium nitrate?
Your account is open, so all 30,000+ MCQs from every chapter are yours. Start practising SSC Chemistry →
Want to keep going?
A free account carries you on to the next questions and opens 30,000+ MCQs from every chapter. Join before launch and Chirkut bundles are 60% off.
The ones you missed, worth one more look