Q.
Which of the following statements is incorrect?
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a
In 1800, only 31 elements were discovered
b
The recently discovered elements are man-made
c
At present 110 elements are known
d
None of the above
answer is C.
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Detailed Solution
In 1800, only 31 elements were known. By 1865, the number of identified elements had more than doubled to 63. At present 118 elements are known. Of them, the recently discovered elements are man-made.
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