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Which of the following was NOT known by the middle of the nineteenth century?
Your answer:
Correct answer: (a)
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Explanation
Why (a) is correct
That the O2 released comes from water was shown later, through van Niel's work in the twentieth century. The other facts were known by the mid-1800s.
Why the other options are wrong
- (b) · your answer This was known by the mid-nineteenth century.
- (c) · your answer This was known from Priestley and Ingenhousz.
- (d) · your answer This was known by the mid-nineteenth century.
NCERT point: Van Niel: O2 comes from H2O, not CO2.
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