86. The government should make smoking_______(非法的) in order to save lives. 87. ________ (统计数字) show that 50% of the new businesses fail in their first year. 88. With the passing of the so-called “end of the world”, things returned to ________ (正常) soon. 89. Usually what parents do i________ (影响) their children’s behavior in their later life. 90. Doctors are aiming to c________ (集中)more on prevention than cure.下图装置是某种气体X的发生装置和收集装置(必要时可加热)。所用的试剂从下列试剂中选取2~3种:硫化亚铁、二氧化锰、铜屑、氯化铵、稀硝酸、浓盐酸、蒸馏水。
请回答下列问题:
(1)气体X的化学式是 。
(2)所选药品a是 ,b是 ,装置B的作用是 。
(3)用所选的药品制取X时离子方程式是 。
(4)在反应刚开始时A中的主要现象是 。