The radius of which of the following orbit is same as that of the first Bohr's orbit of hydrogen atom?
Li2+ (n = 2)
Li2+ (n = 3)
Be3+ (n = 2)
He+ ( n = 2)
Van der waals' real gas, acts as an ideal gas at which condition?
High temperature, low pressure
Low temperature, high pressure
High temperature, high pressure
Low temperature, low pressure
Ionisation energy in group 1A varies in the decreasing order as
Li > Na > K > Cs
Na > Li > K > Cs
Li > Cs > K Na
K > Cs > Na > Li
Intramolecular hydrogen bond is present in
water
o-nitrophenol
p-nitrophenol
methylamine
B.
o-nitrophenol
Intramolecular H-bonding is present in ortho-nitrophenol.
Which one of the following species acts as both Bronsted acid and base?
H2PO
HPO
HPO
All of these
The reaction, SO2 + O2 → 2SO2 + Heat.
The equilibrium reaction proceeds in forward direction by
addition of O2
removal of O2
addition of inert gas
cannot proceed
Which is soluble in NaNO3 and dil. HCl mixture and forming salt?
(CH3)3CNH2
(CH3)2CHNH2
(CH3)2NH
(CH3)3N
Which of the following type of forces are present in vulcanised rubber?
Weakest intermolecular forces
Hydrogen bonding
Three dimensional network of bonds
Metallic bonding
If Hf (H2O) is -286.20 kJ mol-1, then H (OH-) is
-228.88 kJ mol-1
+228.88 kJ mol-1
-343.52 kJ mol-1
+343.52 kJ mol-1