①实验室可用二氧化锰和浓盐酸反应制取氯气，反应的化学方程式是____

②氯碱工业生产氯气的化学方程式为____

③由于氯气贮存运输不方便，工业上常将氯气转化为漂白粉，工业上生产漂白粉的主要化学方程式是____，在空气中漂白粉长期存放会变质而失效的原理是（用化学方程式说明）____．

The Voice of China

    Many Chinese like watching The Voice of China, because the songs sound really good. My daughter, my wife and I like it, too. We watch the programme(节目) every Friday. Some famous singers like Wang Feng, Zhang Huimei, Na Ying, Harlem Yu are the coaches. The coaches listen to the songs, and find their favorite singers. They can listen to the singers , but they can't watch the singers sing . Then they teach (教) their favorite singers. The singers sing songs again. The Voice of China is to find the best voice.