The oxidation numbers of Cl in Cl2O and S in S4O62– are
A. +1 and + 6, respectively.
B. +1 and + 4, respectively.
C. +1 and + 2.5, respectively.
D. –1 and + 6, respectively.
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The greater the electromotive force, the faster the redox reaction rate.
The larger the electrode potential E value, the stronger the oxidation state of the oxidized substance in the electric pair.
Titration of HCl with NaOH should use as the acid-base indicator.
A. methyl orange
B. phenolphthalein
C. methyl red
D. all of the above
Which of the following statements about buffer solution is incorrect?
A. Buffer solutions can only be configured by acids and bases.
B. The common ion effect is the reason why the buffer solution is effective.
C. Amphoteric substances and suitable acids can prepare buffer solutions.
D. The buffer capacity of the buffer solution is related to the acid-base concentration.
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