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JEE Chemistry Solved Question Paper 2019

Multiple Choice Questions

For the following reactions, equilibrium constans are given:

S(s) + O₂(g) $⇌$ SO₂(g); K₁ = 10⁵²

2S(s) + 3O₂(g) $⇌ 2$ SO₃(g); K₂ = 10¹²⁹

The equilibrium constant for the reaction,

2SO₂(s) + O₂(g) $⇌ 2$ SO₃(g)

10¹⁸¹
10⁷⁷
10¹⁵⁴
10²⁵

The correct statement about ICl₅ and ICl $_{4}^{-}$ is:

ICl₅ is trigonal bipyramidal and ICl $_{4}^{-}$ is tetrahedral
ICl₅ is square pyramidal and ICl $_{4}^{-}$ is tetrahedral
both are isostructural
ICl₅ is square pyramidal and ICl $_{4}^{-}$ is square planar.

3.
Among the following molecules/ ions,
$C_{2}^{2 -}, N_{2}^{2 -}, O_{2}^{2 -}, O_{2}$
Which one is diamagnetic and has the shortest bond length?

$O_{2}^{2 -}$

C $_{2}^{2 -}$

N $_{2}^{2 -}$

O₂

C $_{2}^{2 -}$

Bond Order C $_{2}^{2 -}$ = 3, N $_{2}^{2 -}$ = 2; O $_{2}^{2 -}$ = 1 and O₂= 2.

C $_{2}^{2 -}$ is diamagnetic since all electrons are paired and have shortest bond lenght due to triple bonds.

The percentage composition of carbon by mole in methane is :

The strength of 11.2 volume solution of H₂O₂ is: [Given that molar mass of H=1 g mol^–1 and O=16 g mol^–1]

1.7%
34%
13.6%
3.4%

If p is the momentum of the fastest electron ejected from a metal surface after the irradiation of light having wavelength λ, then for 1.5 p momentum of the photoelectron, the wavelength of the light should be: (Assume kinetic energy of ejected photoelectron to be very high in comparison to work function) :

$\frac{2}{3} λ$
$\frac{4}{9} λ$
$\frac{3}{4} λ$
$\frac{1}{2} λ$

5 moles of an ideal gas at 100 K are allowed to undergo reversible compression till its temperature becomes 200 K. If CV = 28 J K–1 mol–1, calcuIate ΔU and ΔPV for this process. ( R= 8.0 JK^-1 mol^-1 )