Question

Q5. Which of the following sales does not display aqueous decomposition?
1) KNO3
2) NaCl
3) K2SO4
4) CH3COONA

Answer 1

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K2SO4

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Answer 2

All salts shown here are soluble in water and thus they all can be decomposed. Better question may be which salt is least decomposed.  Potassium Nitrate breaks into Potassium Nitrite(KNO2)  and 1/2 O2. Sodium Chloride breaks into Na+ And cl- ions when dissolved in water.  Similarly, CH3COONa and K2SO4 breaks into their respective ions. So, simply all salts in this list breaks down when dissolved in water.