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) + 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
B.
1.25 V
From G° = -nFE°
where, n = number of moles of electrons transferred = 2
F = 96500 C
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
The IUPAC name of the complex ion formed when gold dissolves in aqua-regia is
tetrachloridoaurate (III)
tetrachloridoaurate (I)
tetrachloridoaurate (II)
dichloridoaurate (III)
A (g) 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.
Column I | Column II |
A. Acetic acid | i. Stephen |
B. Sodium phenate | ii. Friedel Crafts |
C. Methyl cyanide | iii. HVZ |
D. Toulene | iv. Kolbe's |
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 Y + Z
Y can be obtained by Etard's reaction, Z undergoes disproportionation reaction with concentrated alkali. X could be