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一道全英文的化学题One of the species in the chemical indicator HIn

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一道全英文的化学题
One of the species in the chemical indicator HIn􀀁 exhibits a yellow colour.If acid is added,
the indicator turns red.Which of the following is correct?
Red Yellow
A.In2-􀀁 H2In
B.In2-􀀁 HIn-􀀁
C.HIn-􀀁 H2In
D.H2In HIn-
请问这这么解?􀀁HIn是什么?
How does the oxidation number change for O if Na2O2 is converted to Na and O2
A.decreases by 1
B.no change
C.increases by 1
D.increases by 2
􀀁HIn是甲基橙.分子态 HIn 显红色,而酸根离子 In- 显黄色.对甲基橙,当 [ HIn ] = 2 [ In- ] 时,即可显红色；而当 [ In- ] = 10 [ H In ] 时,才显黄色.
选C 过氧化钠变成纳何氧气时养的化合价升高了1
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