Q.

The mass ratio of Calcium oxide is

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a

10:2

b

40:8

c

2:5 

d

5:2

answer is B.

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Detailed Solution

The mass ratio of Calcium oxide (CaO) is 5:2. The atomic mass of calcium is around 40 and oxygen is 16.

So, mass ratio = 40/16 = 5/2.

  
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