A black powder is burned in air.
The gas produced dissolves in water to form solution R. The pH of R is close to 7.
The gas is readily absorbed in aqueous sodium hydroxide.
What type of substance is present in solution R?
A strong acid
B strong base
C weak acid
D weak base
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Answer:
B. strong base
Explanation:
the PH value of R is close to 7 that's why the strong base is present in R
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