For the following reactions, equilibrium constans are given:

S(s) + O₂(g) $\rightleftharpoons$SO₂(g); K₁ = 10⁵²

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

The equilibrium constant for the reaction,

2SO₂(s) + O₂(g) $\rightleftharpoons \; 2$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.

Among the following molecules/ ions, 

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

Which one is diamagnetic and has the shortest bond length?

• ${\mathrm{O}}_2^{2-}$

• C${}_2^{2-}$

• N${}_2^{2-}$

• O₂

The percentage composition of carbon by mole in methane is :

• 20%

• 25%

• 75%

• 80%

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) :

• $\frac{2}{3}\mathrm{\lambda }$

• $\frac{4}{9}\mathrm{\lambda }$

• $\frac{3}{4}\mathrm{\lambda }$

• $\frac{1}{2}\mathrm{\lambda }$

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 )

• ΔU = 14kJ; Δ(pV) = 18kJ

• ΔU = 14kJ; Δ(pV) = 0.8J

• ΔU = 14kJ; Δ(pV) = 4kJ

• ΔU = 2.8kJ; Δ(pV) = o.8J

The ion that has sp³d² hybridization for the central atom, is:

• [ICl₄]^-

• [ICl₂]^-

• [IF₆]^-

• [BrF₂]^-

The maximum prescribed concentration of copper in drinking water is :

• 0.5 ppm

• 3 ppm

• 0.05 ppm

• 5 ppm

The covalent alkaline earth metal halide (X = Cl, Br, I) is :

• MgX₂

• BeX₂

• CaX₂

• SrX₂