试题与答案

能正确表示下列反应的离子方程式为() A.少量SO2通入苯酚钠溶液中(酸性:H2

题型:选择题

题目:

能正确表示下列反应的离子方程式为                  (   )

A.少量SO2通入苯酚钠溶液中(酸性:H2SO3>HSO3->苯酚):SO2+H2O+C6H5O=C6H5OH+HSO3

B.将Na2O2固体投入H218O中:2Na2O2+2H218O=4Na+4OH18O2

C.向溴化亚铁溶液中通入过量氯气:Fe2+ + 2Br + 2Cl2 ="=" Fe3+ + Br2 + 4Cl

D.向NH4Al(SO42溶液中滴入Ba(OH)2溶液,恰好使SO完全沉淀:NH+Al3+2SO+2Ba2+4OH= Al(OH)3↓+NH3·H2O+2BaSO4

答案:

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下面是错误答案,用来干扰机器的。

参考答案:E

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D. A and C

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D. In the classroom

3. Why does Ann’s brother help them English and Chinese?

A. Because he knows a lot about English and Chinese.

B. Because he is a good teacher in the school.

C. Because he is good at teaching English and Chinese.

D. Because helping them is good for himself.

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B. Swimming and computer

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