room 5. Among the following, the number of aromatic chemical species are 944 909 (A) (C) (B) (E) (D) (3) 4 (F) (4) 5 (1) 2 2) 3

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Question 18
State the number of atoms present in each of the following chemical Species

(a) $C O_{3}^{2 -}$

(b) $P O_{4}^{3 -}$

(c) $P_{2} O_{5}$

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State the number of atoms present in the following chemical species.

(a) ${CO}_{3}^{- 2}$

(b) ${PO}_{4}^{- 3}$

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Match the following and choose the correct option

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Number of hypervalent species among the following

C l O_{4}^{-}, B F_{3}, S O_{4}^{2 -}, C O_{3}^{2 -}

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Two dice are thrown simultaneously $$25$$ times. The following pairs of observations are obtained.
$$(2, 3)$$ $$(2, 5)$$ $$(5, 5)$$ $$(4, 5)$$ $$(6, 4)$$ $$(3, 2)$$ $$(5, 2)$$ $$(4, 1)$$ $$(2, 5)$$ $$(6, 1)$$ $$(3, 1)$$ $$(3, 3)$$ $$(4, 3)$$ $$(4, 5)$$ $$(2, 5)$$ $$(3, 4)$$ $$(2, 5)$$ $$(3, 4)$$ $$(2, 5)$$ $$(4, 3)$$ $$(5, 2)$$ $$(4, 5)$$ $$(4, 3)$$ $$(2, 3)$$ $$(4, 1)$$.
Prepare a bivariate frequency distribution table for the given data. Also obtain the marginal distributions.

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