Q.

A gas is found to have the formula (CO)x. Its vapour density is 70. The value of x will be

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a

7

b

4

c

5

d

6

answer is C.

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Detailed Solution

Vapour density = 70Molecular mass = 2x 70 = 140Formula is [CO]xTherefore molecular mass = (12 + 16)x = 140                                      = x × 28 = 140                                ∴     x = 5
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