AP EAPCET 2024 - 18th May Morning Shift | Chemical Bonding and Molecular Structure Question 16 | Chemistry

The correct formula used to determine the formal charge (Q) on an atom in the given Lewis structure of a molecule or ion is ( $V=$ number of valence electrons in free atom, $U=$ number of unshared electrons on the atom, $B=$ number of bonds around the atom)

$Q_1=V-\left(\frac{U}{B}\right)$

$Q_i=V+(U-B)$

$O_r=V-(\nu+B)$

$Q,=V-\left(\frac{B}{U}\right)$

AP EAPCET 2024 - 18th May Morning Shift

MCQ (Single Correct Answer)

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Match the following.

List - I (Bond )	List - II (Bond enthalpy (in $\mathrm{kJ} \mathrm{mol}^{-1}$ )
A $\mathrm{Si}-\mathrm{Si}$	I 240
B $\mathrm{C}-\mathrm{C}$	II 297
C $\mathrm{Sn}-\mathrm{Sn}$	III 348
D $\mathrm{Ge}-\mathrm{Ge}$	IV 248

The correct answer is

$A-12, B=111, C-L, D=N$

$\mathrm{A}=\mathrm{II}, \mathrm{B}-\mathrm{N}, \mathrm{C}-$ III, $\mathrm{D}-1$

$A-11, B=11, C-D=N$

$\mathrm{A}-$ III, $\mathrm{B}-\mathrm{L}, \mathrm{C}, \mathrm{N}, \mathrm{D}-$ II

AP EAPCET 2022 - 5th July Morning Shift

MCQ (Single Correct Answer)

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In the Lewis dot structure of carbonate ion shown under the formal charges on the oxygen atoms 1, 2 and 3 are respectively

AP EAPCET 2022 - 5th July Morning Shift Chemistry - Chemical Bonding and Molecular Structure Question 18 English

$$-2,0,0$$

$$-1,0,-1$$

$$0,-1,-1$$

$$-3,0,+1$$

AP EAPCET 2022 - 5th July Morning Shift

MCQ (Single Correct Answer)

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The set of species having only fractional bond order values is

$$\mathrm{C}_2^{2-}, \mathrm{N}_2, \mathrm{O}_2^{2-}$$

$$\mathrm{O}_2^{+}, \mathrm{O}_2^{-}, \mathrm{N}_2^{+}$$

$$\mathrm{O}_2^{2+}, \mathrm{O}_2, \mathrm{C}_2^{2-}$$

$$\mathrm{Li}_2, \mathrm{H}_2^{+}, \mathrm{C}_2$$

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