For a given reaction, H = 35.5 kJ mol-1 and S = 83.6 JK-1 mol-1. The reaction is spontaneous at : (Assume that H and S do not vary with temperature)
T < 425 K
T > 425 K
T > 298 K
Which one of the following nitro-compounds does not react with nitrous acid?
Which one of the followng statements related to lanthanons is incorrect?
Europium shows +2 oxidation state.
The basicity decreases as the ionic radius decreases from Pr to Lu.
All the lanthanons are much more reactive than aluminium.
Ce(+4) solutions are widely used as oxidizing agent in volumetric analysis
The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the
rate is proportional to the surface coverage
rate is inversely proportional to the surface coverage
rate is independent of the surface coverage
rate of decomposition is very slow
The van't Hoff factor (i) for a dilute aqueous solution of the strong electrolyte barium hydroxide is
Which of the following fluoro-compounds is most likely to behave as a Lewis base?
Natural rubber has:
All cis- onfiguration
Alternate cis- and trans-configuration
Random cis- and trans-configuration
Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?
Which of the following biphenyl is optically active?
A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy U of the gas in joules will be :
The ionic radii of A+ and B- ions are 0.98 x 10-10 m and 1.81 x 10-10 m. The coordination number of each ion in AB is:
The following reaction
is known by the name:
Which of the following statements is correct for a reversible process in a state of equilibrium ?
If the value of an equilibrium constant for a particular reaction is 1.6 x 1012, then at equilibrium the system will contain:
similar amounts of reactants and products.
For the reaction:
X2O4 (l) 2 XO2(g)
U = 2.1 k cal, S = 20 cal K-1 at 300 K
Hence, G is:
2.7 k cal
-2.7 k cal
9.3 k cal
-9.3 k cal
The correct thermodynamic condtions for the spotaneous eaction at all temprature is :
H < 0 and S = 0
H > 0 and S < 0
H < 0 and S > 0
H < 0 and S < 0
The heat of combustion of carbon to CO2 is -393.5 kJ/mol. The heat released upon formation of 35.2 g of CO2 from carbon and oxygen gas is :
- 315 kJ
+ 315 kJ
- 630 kJ
- 3.15 kJ
Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s2 2s2 2p3, the simplest formula for this compound is
Consider the following species :
CN+, CN-, NO and CN
Which one of these will have the highest bond order ?
Among CaH2, BeH2, BaH2, the order of ionic character is
BeH2 < BaH2 < CaH2
CaH2 < BeH2 < BaH2
BeH2 < CaH2 < BaH2
BaH2 < BeH2 < CaH2