Gold sol is not

• a macromolecular colloid

• a lyophobic colloid

• a multimolecular colloid

• negatively charged colloid

For hydrogen-oxygen fuel cell at 1 atm and 298 K

H₂ (g) + $\frac{1}{2}$O₂ (g) → H₂O (l) ; $∆$G° = -240 kJ

E° for the cell is approximately, (Given F = 96500 C)

• 2.48 V

• 1.25 V

• 2.5 V

• 1.26 V

The correct statement is

• The earlier members of lanthanoid series resemble calcium in their chemical properties.

• The extent of actinoid contraction is almost the same as lanthanoid contraction.

• In general, lanthanoid and actinoids do not show variable oxidation states.

• Ce⁴⁺ in aqueous solution is not known.

For Freundlich isotherm a graph of log x/m is plotted against log p. The slope of the line and its y-axis intercept, respectively corresponds to

• $\frac{\mathit{1}}{n} ,\mathit{ }k$

• $\log \frac{1}{n} , k$

• $\frac{1}{n} , \log k$

• $\log \frac{1}{\mathrm{n}}, \log \mathrm{k}$

The IUPAC name of the complex ion formed when gold dissolves in aqua-regia is

• tetrachloridoaurate (III)

• tetrachloridoaurate (I)

• tetrachloridoaurate (II)

• dichloridoaurate (III)

46.

A (g) $\stackrel{∆}{\to }$ P (g) + Q (g) + R (g), follows first order kinetics with a half-life of 69.3 s at 500°C. Starting from the gas 'A' enclosed in a container at 500°C and at a pressure of 0.4 atm, the total pressure of the system after 230 s will be

• 1.15 atm

• 1.32 atm

• 1.22 atm

• 1.12 atm

A crystalline sold XY₃ has ccp arrangement for its element Y. X occupies

• 66% of tetrahedral voids

• 33% of tetrahedral voids

• 66% of octahedral voids

• 33% of octahedral voids

Match the reactant in Column I with the reaction in Column II.

• A - iii; B - i; C - iv; D - ii

• A - iv; B - ii; C - iii; D - i

• A - ii; B - iii; C - i; D - iv

• A - iii; B - iv; C - i; D - ii

X $\underset{\left(\mathrm{Reductive}\right)}{\overset{\mathrm{Ozonolysis}}{\to }}$ Y + Z

Y can be obtained by Etard's reaction, Z undergoes disproportionation reaction with concentrated alkali. X could be

P $\underset{\left(\mathrm{ii}\right) {\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{\left(\mathrm{i}\right) {\mathrm{CH}}_3\mathrm{MgBr}}{\to }} \mathrm{R} \underset{∆}{\overset{\left(\mathrm{i}\right) \mathrm{dil}. \mathrm{NaOH}}{\to }}$

4-methylpent-3-en-2-one P is

• propanone

• ethanamine

• ethanenitrile

• ethanal