Answer : 0.00684 kg is not equal to 0.0684 dkg.
Explanation :
The conversion used for mass from kilogram to dekagram is :
1 kg = 100 dkg
The conversion used for mass from kilogram to grams is :
1 kg = 1000 g
The conversion used for mass from kilogram to centigrams is :
1 kg = 100000 cg
The conversion used for mass from kilogram to milligrams is :
1 kg = 1000000 mg
Now we have to determine the same mass as 0.00684 kg.
(1) 1 kg = 100 dkg
0.00684 kg =

(2) 1 kg = 1000 g
0.00684 kg =

(3) 1 kg = 100000 cg
0.00684 kg =

(4) 1 kg = 1000000 mg
0.00684 kg =

Hence, from this we conclude that, 0.00684 kg is not equal to 0.0684 dkg.