【简答题】(17分)具有还原性的无水草酸是无色无臭的透明结晶或白色粉末。草酸在浓硫酸并加热条件下容易脱去水分,分解为二氧化碳和一氧化碳。 (1)草酸(H 2 C 2 O 4 )分解的化学方程式 为: , 下列装置中,可用于草酸分解制取气体的是 。(填字母) (2)某探究小组利用草酸分解产生的混合气体和铁锈反应来测定铁锈样品组成(假定铁锈中只有Fe 2 O 3 · n H 2 O和Fe两种成份),实验装置如下...
【单选题】Studying abroad is still an attractive option for students, as figures show that graduates from foreign universities can still expect to earn more than graduates from Chinese universities.
A.
Most women have to watch their figure .
B.
The movement is supported by key figures in the three main political parties.
C.
It would be very nice if we had a true figure of how many people in this country haven't got a job