EXAMIANS
A sample of well water contains 140 gm/m³ Ca²⁺ ions and 345 gm/m³ Na⁺ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO₃ in gm/m³ is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16)
YOUR ANSWER : ?
YOUR ANSWER : ?
One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH₄ + 2O₂ → CO₂ + 2H₂O. Both the reactants and products are in gas phase. ΔH°298 = - 730 kJ/mole of methane. If the average specific heat of all the gases/vapour is 40 J/mole.K, the maximum temperature rise of the exhaust gases in °C would be approximately equal to
YOUR ANSWER : ?
Kinematic viscosity of 1 m² /second is equivalent to __________ stokes.
YOUR ANSWER : ?
1 kg of calcium carbide (CaC₂) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour?
YOUR ANSWER : ?
Which of the following has the least (almost negligible) effect on the solubility of a solute in a solvent?
YOUR ANSWER : ?
The vapor pressure of a substance, at its melting point, is __________ in the solid state as compared to that in the liquid state.
YOUR ANSWER : ?
Isotonic solutions must have the same
YOUR ANSWER : ?
Boiling point of a non-homogeneous mixture of immiscible liquids is __________ that of any one of its separate components.
YOUR ANSWER : ?
Assume that benzene is insoluble in water. The normal boiling points of benzene and water are 80.1 and 100°C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water is
YOUR ANSWER : ?
The heat change for the reaction, C(s) + 2S(s) → CS₂(l), is 104.2 kJ. It represents the heat of
YOUR ANSWER : ?