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The atomicity of K2Cr2O7 is - 9
- 11
- 10
- 12
Correct: (b) 11
Explanation: The number of atoms in the molecules of an element is known as its atomicity. In the case of K2Cr2O7, there are 2 atoms of potassium(K), atoms of chromium(Cr) and 7 atoms of oxygen (O). So the atomicity of this compound is the sum of all the atoms present in this compound i.e 2+2+7=11.
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