For adiabatic process, which is correct?
T = 0
S = 0
q = 0
qp = 0
C.
q = 0
Adiabatic process is a process that occurs without transfer of heat or mass of substances between a thermodynamic system and it surroundings. Therefore, q = 0
In the van der Waals equation, 'a' signifies
intermolecular attraction
intramolecular attraction
attraction between molecules and wall of container
volume of molecules
A.
intermolecular attraction
In van der Waal's equation, a signifies the intermolecular force of attraction.
Smallest wavelength occurs for
Lyman series
Balmer series
Paschen series
Brackett series
A.
Lyman series
Smallest wavelength occurs in Lyman series.
Wavelength increases from Lyman > Balmer > Paschen > Brackett > Pfund.
Which of the following is not hygroscopic?
CsCl
MgCl2
CaCl2
LiCl
A.
CsCl
CsCl is not hygroscopic in nature while MgCl2, CaCl2 and LiCl are hygroscopic in nature.
Ksp of CaSO4.5H2O is 9 10-6, find the volume for 1 g of CaSO4 (M.wt. = 136).
2.45 litres
5.1 litres
4.52 litres
3.2 litres
A.
2.45 litres
CaSO4 (s)
Ksp = S2 = 9 10-6
S = 3 10-3 mol L-1
Solubility in g litre-1 = molecular mass S
= 136 3 10-3 = 408 10-3 g L-1
408 10-3 g of CaSO4 present in 1 litre.
1 gm of CaSO4 present is
Which of the following is not a characteristic of equilibrium?
Rate is equal in both directions
Measurable quantities are constant at equilibrium.
Equilibrium occurs in reversible condition.
Equilibrium occurs only in open vessel at constant temperature.
D.
Equilibrium occurs only in open vessel at constant temperature.
Equilibrium state can only be achieved if a reversible reaction is carried out in a closed space.
Which of the following is wrong for Bohr model?
It establishes stability of atom
It is inconsistent with Heisenberg uncertainty principle.
It explains the concept of spectral lines for hydrogen like species.
Electrons behave as particle and wave
D.
Electrons behave as particle and wave
Among all the given options, option d is wrong. It can be corrected as Bohr model does not explain de Broglie concept of the dual character of matter.
Predict the product of reaction of I2 with H2O2 in basic medium
I-
I2O3
IO
I
A.
I-
I- is the product of reaction in basic medium.
I2 (s) + H2O2 (aq) +2OH- (aq) 2I- (aq) + 2H2O (l) + O2 (g)
Decreasing order of bond angle is
BeCl2 > NO2 > SO2
BeCl2 > SO2 > NO2
SO2 > BeCl2 > NO2
SO2 > NO2 > BeCl2
A.
BeCl2 > NO2 > SO2
Decreasing order of bond angle is BeCl2 > NO2 > SO2.
Bond angle of BeCl2, NO2 and SO2 is 180, 132 and 119.5 respectively.
The enthalpy of formation of CO(g), CO2(g), N2O(g), and N2O4(g) is -110, -393, +811 and 10 kJ/mol respectively. For the reaction, N2O4 + 3CO(g) N2O(g)+ 3CO2(g); Hr (kJ/mol) is
-212
+212
+48
-48
D.
-48
N2O4(g)+ 3CO(g) N2O (g) + 3CO2 (g)
= [811 - 1179] - [-320]
= -368 + 320
= -48 kJ/mol
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