Identification of Substances

Which of the following is not a decomposition reactions ?

• KClO₃ → KCl + O₂

• Fe + S → FeS

• 2HgO → 2Hg + O₂

• H₂CO₃ → CO₂+H₂O

If a compound is insoluble in water, different methods should be tried to dissolve it. These methods could not be:

• forming soluble complexes

• adding water

• using redox reactions

• changing the pH of the medium

Which of the following compounds was not used during the experiment ?

• Citric Acid

• Washing Soda

• Baking Soda

• Alka Seltzer

• Potassium carbonate

Which of the following was not use during the experiment?

• 
• 
• 
• 
• 

Which of the following is not a double displacement reactions ?

• NaCl + AgNO₃ → NaNO₃ + AgCl

• 2KI+Pb(NO₃)₂→2KNO₃+PbI₂

• Na₂CO₃ + HCl → NaCl+ H₂O + CO₂

• Zn + 2HCl → ZnCl₂ + H₂

An indicator used in acid-base titrations. It turns pink in the presence of bases and colorless in the presence of acids or neutrals. What is this compound ?

• Sulfuric acid

• Sodium Bicarbonate

• Phenolphthalein

• Vinegar