Among the following, the maximum covalent character is shown by the compound
FeCl2
SnCl2
AlCl3
AlCl3
The hybridization of orbitals of N atom in NO3-, NO2+ and NH4+ are respectively
sp, sp2,sp3
sp2 , sp, sp
sp, sp3 , sp2
sp, sp3 , sp2
A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emission is at 680 nm, the other is at
1035 nm
325 nm
743 nm
743 nm
The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm3 to a volume of 100 dm3 at 27°C is
38.3 J mol-1 K-1
35.8 J mol-1 K-1
32.3 J mol-1 K-1
32.3 J mol-1 K-1
'a' and 'b' are van der Waals constants for gases. Chlorine is more easily liquefied than ethane because :
a and b for Cl2 > a and b for C2H6
a and b for Cl2 < a and b for C2H6
a and Cl2 < a for C2H6 but b for Cl2 > b for C2H6
a and Cl2 < a for C2H6 but b for Cl2 > b for C2H6
The outer electron configuration of Gd (Atomic No : 64) is
4f3 5d5 6s2
4f8 5d0 6s2
4f4 5d4 6s2
4f4 5d4 6s2
Identify the compound that exhibits tautomerism
2-Butene
Lactic acid
2-Pentanone
2-Pentanone
C.
2-Pentanone
Which of the following statement is wrong?
The stability of hydrides increases from NH3 to BiH3 in group 15 of the periodic table.
Nitrogen cannot form dπ-pπ bond.
Single N - N bond is weaker than the single P - P bond.
Single N - N bond is weaker than the single P - P bond.
A 5.2 molal aqueous solution of methyl alcohol, CH3OH, is supplied. What is the mole fraction of methyl alcohol in the solution?
0.100
0.190
0.086
0.086
Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it form freezing at - 6° C will be : (Kf for water = 1.86 K kg mol-1, and molar mass of ethylene glycol = 62g mol-1)
804.32 g
204.30 g
400.00 g
400.00 g