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
, 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
D.
S decreases
If adorption of a gas on solid-metal surface is spontaneous and exothermic then more and more energy will comes out means negative values of H increases and movement of gas particles decreases means ΔS decreases. Hence correct option is entropy 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