What percentage of $\mathrm{\beta }$-D-(+-glucopyranose is found at equilibrium in the aqueous solution?

• 64%

• 36%

• $\approx$100%

• $\approx$50%

$∆\mathrm{H} \mathrm{and} ∆\mathrm{S}$ 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⁺

At equilibrium, the rate of dissolution of a solid solute in a volatile liquid solvent is

• less than the rate of crystallisation

• greater than the rate of crystallisation

• equal to the rate of crytallisation

• zero

pK_a of acetic acid and pK_b of ammonium hydroxide are 4.76 and 4.75 respectively. Calculate the pH of ammonium acetate solution.

• 6.02

• 7.005

• 8

• 5.602

The value of K_c for the reaction,

2A  B + C is 2 x 10^-3. At a given time, if the composition of reaction mixture is [A] = [B] = [C] = 3 x 10^-3 M. Which is true?

• The reaction will proceed in forward direction

• The reaction will proceed in backward direction

• The reaction will proceed in any direction

• None of the above

For the homogeneous reaction,

4NH₃ + 5O₂ $\rightleftharpoons$ 4NO + 6H₂O

the equilibrium constant K_c has the units

• conc.⁺¹⁰

• conc.⁺¹

• conc.^-1

• it is dimensionless

70.

Ammonia is a Lewis base and it forms complexes with many cations. Which one of the following cations does not form a complex with ammonia?

• Ag⁺

• Cu²⁺

• Cd²⁺

• Pb²⁺