The standard enthalpy of vapourisation Δvap H° for water at 100°C is 40.66 kJ mol-1. The internal energy of vapourisation of water 100°C (in kJ mol-1) is (assume water vapour to behave like an ideal gas).
+ 4376
+40.66
+37.56
None of these
The wavelength of associated wave of a particle moving with a speed of one-tenth that of light is 7Å. The particle must be
electron
proton
nanoparticle
photon
Which mathematical statement did not prove false?
A.
The mathematical statement ΔE = hv did not proved false inspite of any verification. Thus equation states that each photon possess energy, E equal to hv It is also known as Planck's equation.
, but the product is also radioactive and give 235U. Which particles(s) is/ are emitted by the product?
4 neutrons
4 protons
4 protons and 2electrons
2 neutrons and 2 protons
If the adsorption of a gas on solid metal surface is spontaneous and exothermic, then
H increases
S increases
G increases
S decreases
What is the solubility of silver bromide in one litre of 0.4 molar NH3 solution (K =10x108)?
80 × 10-6 mol
2.8 × 10-3 mol
115 × 10-3 mol
0.98 g
4.9 g of H2SO4 is present in 100 mL solution. The molarity and normality of the solution will be
Molarity = 1M, Normality= 0.5N
Molarity = 1M, Normality= 0.25N
Molarity = 0.5M, Normality= 1N
Molarity = 2M, Normality= 3N
0.0833 mole of a carbohydrate of empirical formula CH2O contains 1.00 g of hydrogen. The molecular formula of the carbohydrate is.
C5H10O5
C3H4O3
C12H22O11
C6H12O6