At identical temperature and pessure, the ratio of diffusion of hydrogen gas is times that of a hydrocarbon having molecular formula CnH2n-2. What is the value of 'n'?
Which of the following thermodynamic relation is correct ?
dG = Vdp- SdT
dE = pdV + TdS
dH = -Vdp + Tds
dG = Vdp + SdT
Calculate Kc for the reversible process given below if Kp = 167 and T = 800°C
CaCO3 (s) CaO (s) + CO2 (g)
For a reversible chemical reaction where the forward process is exothermic, which of the following statements is correct ?
The backward reaction has higher activation energy than the forward reaction.
The backward and the forward processes have the same activation energy.
The backward reaction has lower activation energy
No activation energy is required at all since energy is liberated in the process.
In Sommerfeld's modification of Bohr's theory, the trajectory of an electron in a hydrogen atom is
a perfect ellipse
a closed ellipse-like curve, narrower at the perihelion position and flatter at the aphelion position
a closed loop on spherical surface
In the reaction of sodium thiosulphate with I2 in aqueous medium, the equivalent weight of sodium thiosulphate is equal to
molar mass of sodium thiosulphate
the average of molar masses of Na2S2O3 and I2
half the molar mass of sodium thiosulphate
molar mass of sodium thiosulphate × 2
0.1M HCl and 0.1M H2SO4 each of volume 2 mL are mixed and the volume is made upto 6 mL by adding 2 mL of 0.01N NaCl solution. The pH of the resulting mixture is
log 2 - log 3
Millimoles of H+ = 0.1 × 2 + 0.1 × 2 × 2 = 0.6
Total volume in mL = 6
pH = -log10[H+] = - log = -log 0.1 = 1
The molarity of a NaOH solution by dissolving 4 g of it in 250 mL water is
If a species has 16 protons, 18 electrons and 16 neutrons, find the species and its charge.