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ICSE Class 10 Chemistry 2014 Paper

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An element ZZ has atomic number 16. Answer the following questions on ZZ :
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Question : 82 of 88
Marks: +1, -0
State the formula between ZZ and Hydrogen.
Solution:  
Z's valency =2=-2
H=+1\mathrm{H}=+1 So formula H2Z\mathrm{H}_2 \mathrm{Z}
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