Question

$0.42g$ magnesium carbonate and $0.5g$ calcium carbonate are; heated strongly. What is the quantity left?

• A. 0.48 g
• B. 0.80 g
• C. 0.42 g
• D. 0.28 g

Answer 1

Answer: (A)

Total weight $=$ w t.of $MgO+$ wt of $CaO$
$=0.005\times 40+0.005\times 56$
$=0.48g$