Question 1
Choose the INCORRECT statement.
◦ Sb and As are usually referred to as metalloids.
◦ Nitrogen is obtained by fractional distillation of liquefied air.
◦ Phosphorus is important in fertilizers.
◦ As and Sb are used in semiconductor materials.
◦ Nitrides are compounds of nitrogen in the 3+ oxidation state.
Question 2
Choose the INCORRECT statement.
◦ Acid anhydrides plus water generate an acid.
◦ H
5P
3O
10 is diphosphoric acid or pyrophosphoric acid.
◦ H
3PO
3 is phosphorous acid.
◦ H
3PO
4 is phosphoric acid.
◦ Phosphorus is very important in biochemistry as ADP and ATP.