Questions asked by Naveen .

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• NH4 is a polyatomic ions its net charge is 1+ but its total no.of protons is 11 and electrons is 11 but net charge is 1+? iam confused!!!!
  
• Is magnesium nitrate a salt????
  
• If reaction between acid and metal always give salt and H2????
  
• Why Hydrogen can't exist alone in water???