MnO (1 mole) in neutral aqueous medium is disproportionated to
2/3 mole of MnO and 1/3 mole of MnO2
1/3 mole of MnO and 2/3 mole of MnO2
1/3 mole of Mn2O7 and 1/3 mole of MnO2
2/3 mole of Mn2O7 and 1/3 mole of MnO2
Intermolecular hydrogen bonding is strongest in
methylamine
phenol
formaldehyde
methanol
D.
methanol
Methanol has strongest intermolecular hydrogen bonding because it has more -OH group.
---H - O(CH3) ----H - O(CH3) ----H - O(CH3)
With the increase of electronegativity and decrease in size of the atom to which hydrogen is colvalently linked, the strength of the hydrogen bond increases.
Which of the following are arranged in the decreasing order of dipole moment?
CH3Cl, CH3Br, CH3F
CH3Br, CH3Cl, CH3F
CH3Cl, CH3Br, CH3F
CH3Br, CH3F, CH3Cl
Which of the following compounds possesses the C-H bond with the lowest bond dissociation energy?
Toluene
Benzene
n-Pentane
2,2-Dimethylpropane
One gram sample of NH4NO3 is decomposed in a bomb calorimeter. The temperature of the calorimeter increases by 6.12 K. The heat capacity of the system is 1.23 kJ/g/deg. What is the molar heat of decomposition for NH4NO3 ?
-7.53 kJ/mol
-398.1 kJ/mol
-16.1 kJ/mol
-602 kJ/mol
Which one of the following has S° greater than zero?
CaO(s) + CO2(g) CaCO3(s)
NaCl(aq) NaCl(s)
NaNO3(s) Na+(aq) + NO3-(aq)
N2(g) + 3H2(g) 2NH3(g)