Solidelements,codedasG,JandQ,belongtothesameperiodoftheperiodictable,andformoxideswiththefollowingproperties:

GO3reactswithwatertoformastronglyacidicsolution,

J2O3reactswithstrongacidsandstrongalkalis,

Q2Oreactswithwatertoformastronglyalkalinesolution.

(a) Statewhichoxidewouldbedescribedasamphoteric. (1mark)

(b) State,givingreasons,whichofG,JorQismostelectronegative. (2mark)

(c) State,givingreasons,whichoxideismolecular. (3mark)

Answer: G is S (sulfur), J is Al (aluminum), and Q is Na (sodium).

(a) Al2O3 is an amphoteric oxide, which can react with both strong acids and strong bases.

(b) Generally speaking, from left to right in the periodic table, the electronegativity of the elements gradually increases, while from top to bottom, the electronegativity of the elements gradually decreases, so the most electronegativity is the sulfur element, followed by aluminum, and the smallest is sodium.

(c) At room temperature, SO3 is a gas, Al2O3 is a solid, and Na2O is a white slightly yellowish powder, so the molecular oxide is SO3.

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