TRUE: ZnO - is amphoteric oxide, Radius of Br is bigger than radius of Cl, 2 moles of oxygen occupy 44.8 L (STP), Double bond consist of 1 sigma and 1 pi bonds, 0.5 L of 2M solution contains 1 mole of solute, 1 mole of any substance contains 6.02×1023 particles, FALSE: HCl and CaO don't react, pH of KOH solution is less than 7, Isotopes have the same number of neutrones, Energy of double bond is higher than energy of triple bond, When water was added to 10% solution, mass fraction of solute has increased, 5s25p5  - configuration of metal,

General chemistry Revision

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