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JEE Chemistry Solved Question Paper 2007

Multiple Choice Questions

11.
Among the following, the pair in which the two species are not isostructural are

IO $_{3}^{-}$ and XeO₃

PF $_{6}^{-}$ and SF₆

BH $_{4}^{-}$ and NH $_{4}^{+}$

CO $_{3}^{2 -}$ and NO $_{2}^{-}$

CO $_{3}^{2 -}$ and NO $_{2}^{-}$

Among the given options, option d is the correct one.

CO $_{3}^{2 -}$ is trigonal planar in shape and NO $_{2}^{-}$ is bent in shape due to the presence of lone pair.

IO $_{3}^{-}$ , XeO₃ is pyramidal in shape.

PF $_{6}^{-}$ , SF₆ is octahedral in shape.

SF₄ is square planar in shape.

12.

Which of the following ions has a magnetic moment of 5.93 BM ?

(At. no. V = 23; Cr = 24; Mn = 25; Fe = 26)

Mn²⁺
Fe²⁺
Cr²⁺
V³⁺

13.

The equilibrium constant for the reaction

2NO₂ (g) $⇌$ 2NO (g) + O₂ (g) is 2 × 10^-6 at 185°C. Then the equilibrium constant for the reaction,

4NO (g) + 2O₂ (g) $⇌$ 2NO₂ (g) at the same temperature would be

2.5 × 10^-5
4 × 10^-12
2.5 × 10¹¹
2 × 10⁶

14.

Compare List-I and List-II and choose the correct matching codes from the choices given.

List - I	List - II
A. Glycerol	i. Sublimation
B. o-nitrophenol	ii. Beilstein's test
C. Anthracene	iii. Victor- Meyer's method
D. Halogens	iv. Steam distillation
E. Molecular weight	v. Vaccum distillation vi. Eudiometry

A - v; B - iv; C - i; D - ii; E - iii
A - iv; B - v; C - i; D - vi; E - ii
A - vi; B - iv; C - i; D - iii; E - ii
A - v; B - iv; C - vi; D - ii; E - iii

15.

An aromatic hydrocarbon with empirical formula C₅H₄ on treatment with concentrated H₂SO₄ gave a monosulphonic acid. 0.104 g of the acid required 10 mL of $\frac{N}{20}$ NaOH for complete neutralisation. The molecular formula of hydrocarbon is