Which one of the following is not a correct statement?

  • A
    Botanical gardens have collection of living plants for reference.
  • B
    $A$ museum has collection of photographs of plants and animals.
  • C
    Key is a taxonomic aid for identification of specimens.
  • D
    Herbarium is a store house that contains dried,pressed and preserved plant specimens.

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$A$ metal salt gives a yellow precipitate with potassium chromate in acetic acid and a white precipitate with dilute sulfuric acid. However,it does not give a precipitate with sodium chloride or iodide. What will be the composition of the white precipitate formed when sodium carbonate is added to the solution of the metal salt?

In which interval is the function $f(x) = 2x^2 - \ln |x|, (x \neq 0)$ monotonically decreasing?

Which one of the following ions is the most stable in aqueous solution? (At. No. $Ti = 22, V = 23, Cr = 24, Mn = 25$)

Two pendulums have time periods $T$ and $5T/4$. They start $SHM$ at the same time from the mean position. After how many oscillations of the smaller pendulum will they be again in the same phase?

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