A process will be spontaneous at all temperatures if :

• ΔH <0 and ΔS <0

• ΔH <0 and ΔS >0

• ΔH >0 and ΔS >0

• ΔH >0 and ΔS <0

At 300k and 1 atmospheric pressure 10ml of a hydrocarbon required 55mL of O₂ for complete combustion and 40mL of CO₂ is formed. The formula of the hydrocarbon is:

• C₄H₆

• C₄H₇Cl

• C₄H₈

• C₄H₁₀

During the change of O₂ to O${}_2^{-}$, the incoming electrons goes to the orbital;

• π^*2P_x

• π2P_x

• σ*2P_x

• π2P_y

Consider the following table:

Gas	a/(kPa dm6mol-1)	b/(dm3mol-1)
A	642.32	0.05196
B	155.21	0.04136
C	431.91	0.05196
D	155.21	0.4382

And b are vander walls contants . The correct statement a Bout the gases is :

• Gas A will occupy than gas D  Compressible than gas D Gas C will Occupy more volume than

• gas A gas B will be more compressible than gas D Gas C will Occupy Lesser volume than

• Gas A gas B will be more compressible than gas D Gas C will Occupy Lesser volume than

• Gas A: gas B will be lesser Compressble than gas D

The graph between Ψ² and r(radial diatance) is shown beow . This represents

• 2s orbital

• 2p orbital

• 3s orbital

• 1s orbital

Consider the following statements

a) The pH of a mixture containing 400mL of 0.1M H2SO4 and 400 mLof 0.1M NaOH will be approximately 1.3.

b) Ionic product of water is temperature dependent.

c) A monobasic acid with Ka=10^-5 has a pH=5. The degree of dissociation of this acid is 50%.

d) The Le Chatelier’s Principle is not applicable to common-ion effect.

The correct statements are

• b and c

• a,b and d

• a,b, and c

• a and b

The correct order of catenation is

• Si >Sn >C >Ge

• C >Sn> Si ≈Ge

• Ge >Sn >Si >C

• C> Si> Ge ≈C

The isoelectronic set of ions is :

• Li⁺, Na⁺, O^2- and F^-

• N^3-, O^2-, F^- and Na⁺

• F^-, Li⁺, Na⁺ and Mg²⁺

• N^3-,Li⁺, Mg²⁺ and O^2-

The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reactions is :

• III < I <II

• III< II<I

• I< III< II

• II< I < III

The major product of the following reaction is :