The correct order of basic strength of the following are

• I > II > IV > III

• IV > III > II > I

• II > III > IV I

• III > IV > II > I

12.

If for a given substance, melting point is T_B and freezing point is T_A then correct variation of entropy by graph between entropy change and temperature is

• 

• 

• 

• 

$∆\mathrm{H} \mathrm{and} ∆\mathrm{S}$ for the rreaction,

Ag₂O(s) $\to$2Ag(s) + $\frac{1}{2}$ O₂ (g) are 30.56 kJ mol^-1 and 66.00 JK^-1 mol^-1 respectively. The temperature at which the free energy change for the reaction will be zero is

• 3528 K

• 463 K

• 73 K

• 144 K

Ig Ag⁺ + 2NH₃ $\rightleftharpoons$Ag (NH_{3${)}_2^{+}$ ; K1} = 1.7 x 10⁷

Ag⁺ + Cl^- $\rightleftharpoons$ AgCl; K₂ = 5.4 x 10⁹

Then, for AgCl + 2NH₃ $\rightleftharpoons$[Ag(NH₃)₂]⁺ + Cl^- equilibrium constant will be

• 0.68 x 10^-3

• 5.2 x 10^-17

• 0.31 x 10^-2

• 3.1 x 10^-2

For the following equilibrium (omitting charges)

I. M + Cl $\to$ MCl, K_eq = $\mathrm{\beta }$₁

II. MCl + Cl $\to$MCl₂, K_eq = $\mathrm{\beta }$₂

III. MCl₂ +Cl $\to$ MCl₃ ,K_eq  = $\mathrm{\beta }$₃

IV. M + 3Cl $\to$ MCl₃ , K_eq = K

then relationship between K, ${\mathrm{\beta }}_1 , {\mathrm{\beta }}_{2 }\mathrm{and} {\mathrm{\beta }}_3$

• K = ${\mathrm{\beta }}_1{\mathrm{\beta }}_2{\mathrm{\beta }}_3$

• $\log \mathrm{K} = \log {\mathrm{\beta }}_1 + \log {\mathrm{\beta }}_2 + \log {\mathrm{\beta }}_3$

• ${\mathrm{p}}_{\mathrm{k}} = {\mathrm{p}}_{{\mathrm{\beta }}_1} + {\mathrm{p}}_{{\mathrm{\beta }}_2 }+ {\mathrm{p}}_{{\mathrm{\beta }}_3}$

• All of the above

R - CH₂ - CH₂ - OH can be converted into RCH2CH2COOH by the following sequence of steps.

• PBr₃, KCN, H₂ /Pt

• PBr₃, KCN, H₃O⁺

• HCN, PBr₃, H₃O⁺

• KCN, H₃O⁺

0.001 mole of [Co(NH₃)₅(NO₃) (SO₄)] was passed through a cation exchanger and the acid coming out of it required 20mL of 0.1 M NaOH for neutralisation. Thus, the complex is

• [Co(NH₃)₅(NO₃)] SO₄

• [Co(NH₃)₅(SO₄)]NO₃

• [Co(NH₃)₅] NO₃.SO₄

• None of the above

In the complexes [Fe(H₂O)₆]³⁺ , [Fe(CN)₆]^3-, [Fe(C₂O₄)₃]^3- and [FeCl₆]^3-, more stability is

• [FeCl₆]^3-

• [Fe(C₂O₄)₃]^3-

• [Fe(H₂O)₆]³⁺

• [Fe(CN)₆]^3-

A student made the following observations in the laboratory.

I. Clean copper metal did not react with 1 molar Pb(NO₃)₂ solution

II. Clean lead metal dissolved in a 1 molar AgNO₃ solution and crystals of Ag metal appeared

III. Clean silver metal did not react with 1 molar Cu(NO₃)₂ solution

The order of decrease in reducing character of three metals is

• Pb, Cu, Ag

• Pb, Ag, Cu

• Cu, Ag, Pb

• Cu, Pb, Ag

In order to prepare one litre 1N solution of KMnO₄, how many grams of KMnO₄ are required, if the solution to be used in acid medium for oxidation?

• 128g

• 41.75 g

• 31.60 g

• 62.34 g