If the equilibrium constant for the reaction,

${\mathrm{H}}_2\left(\mathrm{g}\right)\hspace{0.17em}+ {\mathrm{I}}_2\left(\mathrm{g}\right) \rightleftharpoons 2\mathrm{HI} \left(\mathrm{g}\right) \mathrm{is} \mathrm{K}$. what is the equilibrium constant of $\mathrm{HI}\left(\mathrm{g}\right) \rightleftharpoons \frac{1}{2}{\mathrm{H}}_2\left(\mathrm{g}\right) +\hspace{0.17em}\frac{1}{2}{\mathrm{I}}_2\left(\mathrm{g}\right) ?$

• 1/K

• √K

• K

• 1/√K

The pH of 0.01 M solution of acetic acid is 5.0. What are the values of [H⁺] and K_a respectively?

• 1 × 10^-5M, 1× 10^-8

• 1 × 10^-5M, 1× 10^-9

• 1 × 10^-4M, 1 × 10^-8

• 1 × 10^-3M, 1 × 10^-8

A system is provided with 50 J of heat and the work done on the system is 10 J. What is the change in internal energy of the system in Joules?

• 60

• 40

• 50

• 10

4.

Which one of the following transitions of an electron in hydrogen atom emits radiation of the lowest wavelength?

• n₂ = ∞ to n₁=2

• n₂= 4 to n₁ =3

• n₂= 2 to n₁ =1

• n₂ = 5 to n₁=3

Which one of the following conditions is incorrect for a well behaved wave function (Ψ)?

• Ψ must be fine

• Ψ must be single valued

• Ψ must be infinite

• Ψ must be continuous

The electron affinity values of elements A, B, C and D are respectively -135, -60, -200 and -348 kJ mol^-1. The outer electronic configuration of element B is

• 3s² 3p⁵

• 3s² 3p⁴

• 3s² 3p³

• 3s² 3p²

Match the following

	Column I (molecules)		Column II ( number of lone pair on central atom)
A	NH3	1	Three
B	H2O	2	Two
C	XeF2	3	Zero
D	CH4	4	Four
		5	One

• A B C D

  5 1 3 2

• A B C D

  3 1 2 5

• A B C D

  5 1 2 3

• A B C D

  1 5 3 4

The number of molecules of CO₂ liberated by the complete combustion of 0.1 g atom of graphite in air is

• 3.01 × 10²²

• 6.02 × 10²³

• 6.02 × 10²²

• 3.01 × 10²³

CH₄ diffuses two times faster than a gas X. The number of molecules present in 32 g ofgas X is (N is Avogadro number)

• N

• N/2

• N/4

• N/16

The orange coloured compound formed when H₂O₂ is added to TiO₂ solution acidified with conc. H₂SO₄ is

• Ti₂O₃

• H₂Ti₂O₈

• H₂TiO₃

• H₂TiO₄