The volume of 0.1 M H2SO4 that is needed to completely neutralise 30mL of 0.2 M NaOH solution, is
15mL
30mL
40mL
60mL
B.
30mL
1 moles of crystalline NaCl will have how many unit cells ?
1.506 × 1023
3.012 × 1023
4.518 × 1023
6.023 × 1023
A mixture has 18g water and 414g ethanol. The mole fraction of water in mixture is (assume ideal behaviour of the mixture)
0.1
0.4
0.7
0.9
A chemical reaction is in equilibrium when
the reactants are completely transformed into products
the rate of forward reaction is equal to the rate of backward reaction
the formation of products is minimised
equal amount of reactants and products are present
For the following gaseous reaction, H2 + I2 2HI, the equilibrium constant
Kp > Kc
Kp< Kc
Kp= Kc
Kp= 1/Kc
According to Le-Chatelier's principle which of the following factors influence a chemical system?
Concentration only
Pressure only
Temperature only
Concentration, pressure and temperature
The pH of water decreases with?
increase in temperature
increase in pressure
decrease in temperature
decrease in pressure
For an endothermic reaction where ΔH represents the enthalpy of the reaction in kJ/mol, the minimum value for the energy of activation will be
less than ΔH
Zero
more than ΔH
equal to ΔH