RRB Group D 15-Oct-2018 Shift 1 Solved Paper

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Question : 69 of 84

Marks: +1, -0

In

{CaO}

, Ca and

{O}

are present in the ratio ______ by mass.

8: 3
5: 2
3: 8
2: 5

Solution:

Atomic number of Calcium

=20

Atomic number of Oxygen

=8

So the ratio

=20 / 8=5 / 2

So in

{CaO}, {Ca}

and

{O}

are present in the ratio 5: 2 by mass.

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