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JEE Chemistry Solved Question Paper 2010

Multiple Choice Questions

The number of electrons, neutrons and protons in a species are equal to 10, 8 and 8 respectively. The proper symbol of the species

${}_{8}^{16}O$
${}_{8}^{16}O^{2 -}$
${}_{8}^{16}O^{-}$
${}_{8}^{18}O$

A 600 W mercury lamp emits monochromatic radiation of wavelength 331.3 nm. How many photons are emitted from the lamp per second? (h = 6.626 x 10^-34 Js; velocity of light = 3×10⁸ ms^-1).

1 × 10¹⁹
1 × 10²²
1 × 10²¹
1 × 10²³

The shortest wavelength in hydrogen spectrum of Lyman series when R_H = 109678 cm^-1 is

1002.7 Å
1215.67 Å
1127.30 Å
911.7 Å

Which of the following statements is false?

H₂ molecule has 1σ bond
Acetylene molecule has 3σ bonds and 3Π bonds
HCl molecule has 1σ bond
Water molecule has 2σ bonds and two lone pairs

5.
N₂ and O₂ are converted to monopositive cation $N_{2}^{+}$ and $O_{2}^{+}$ respectively. Which is incorrect?

In $N_{2}^{+}$ , the N-N bond weakened.

In $O_{2}^{+},$ the bond order increases

In $O_{2}^{+},$ paramagnetism decreases

$N_{2}^{+}$ becomes diamagnetic

$N_{2}^{+}$ becomes diamagnetic

$MO configuration of N_{2} molecule is (σ 1 s)^{2} (σ^{*} 1 s)^{2} (σ 2 s)^{2} (σ^{*} 2 s)^{2} (π 2 p_{x})^{2} (π 2 p_{y})^{2} (σ 2 p_{z})^{2} ∴ Bond order of N_{2} = \frac{10 - 4}{2} = 3 MO configuration of N_{2}^{+} is (σ 1 s)^{2} (σ^{*} 1 s)^{2} (σ 2 s)^{2} (σ^{*} 2 s)^{2} (π 2 p_{x})^{2} (π 2 p_{y})^{2} (σ 2 p_{z})^{1} Thus, N_{2}^{+} becomes paramagnetic ∵ bond order of N_{2}^{+} = \frac{9 - 4}{2} = 2.5 and bonder \infty bond energy . ∴ In N_{2}^{+}, the N - N bond is weakened . MO configuration of O_{2} is (σ 1 s)^{2} (σ^{*} 1 s)^{2} (σ 2 s)^{2} (σ^{*} 2 s)^{2} (σ 2 p_{z})^{2} (π 2 p_{x})^{2} (π 2 p_{y})^{2} (π^{*} 2 p_{x})^{1} (π^{*} 2 p_{y})^{1} ∴ bond order = \frac{10 - 6}{2} = 2 MO configuration O_{2}^{+} (σ 1 s)^{2} (σ^{*} 1 s)^{2} (σ 2 s)^{2} (σ^{*} 2 s)^{2} (σ 2 p_{z})^{2} (π 2 p_{x})^{2} (π 2 p_{y})^{2} (π^{*} 2 p_{x})^{1} ∴ bond order = \frac{10 - 5}{2} = 2.5 Hence, O_{2} and O_{2}^{+} both are paramagnetic, but in O_{2}^{+} paramagnetic decreases .$

A netural molecule XF₃ has a zero dipole moment. The element X is most likely

chlorine
boron
nitrogen
carbon

56 g of nitrogen and 96 g of oxygen are mixed isothermally and at a total pressure of 10 atm. The partial pressures of oxygen and nitrogen (in atm) are respectively

How much time (in hours) would it take to distribute one Avogadro number of wheat grains, if 10²⁰ grains are distributed each second?

0.1673
1.673
16.73
167.3

The first () and second (ΔH₂) ionisation enthalpies (in kJ mol^-1) and the (Δ_egH) electron gain enthalpy (in kJ mol^-1) of the elements I, II, III, IV and V are given below

Element ΔH₁ ΔH₂ Δ_egH

I 520 7300 -60

II 419 3051 -48

III 1681 3374 -328

IV 2372 5251 +48