10. Select two compounds in which arsenic has an oxidation state +5 1) As_(2)O_(3) 2) As 3) H_(3)AsO_(4) 4) Na_(2)HAsO_(3) 5) Ba(H_(2)AsO_(4))_(2) Answer (score: 1):

To determine the oxidation state of arsenic in each compound, we need to consider the typical oxidation states of the elements involved and the overall charge of the compound.1) : In this compound, arsenic is bonded to oxygen, which typically has an oxidation state of -2. Since there are two arsenic atoms, the total oxidation state of arsenic must be +6 to balance the -6 charge from the three oxygen atoms. Therefore, the oxidation state of arsenic in this compound is +3.2) As: This is a single atom of arsenic, so its oxidation state is 0.3) : In this compound, arsenic is bonded to oxygen, which has an oxidation state of -2. The compound has a neutral charge, so the total oxidation state of arsenic must be +5 to balance the -8 charge from the four oxygen atoms. Therefore, the oxidation state of arsenic in this compound is +5.4) : In this compound, arsenic is bonded to oxygen, which has an oxidation state of -2. The compound has a neutral charge, so the total oxidation state of arsenic must be +3 to balance the -6 charge from the three oxygen atoms. Therefore, the oxidation state of arsenic in this compound is +3.5) : In this compound, arsenic is bonded to oxygen, which has an oxidation state of -2. The compound has a neutral charge, so the total oxidation state of arsenic must be +5 to balance the -8 charge from the four oxygen atoms. Therefore, the oxidation state of arsenic in this compound is +5.Based on the above analysis, the two compounds in which arsenic has an oxidation state of +5 are:3) 5)