2. A very dilute solution is prepared by dissolving 'x1' mole of solute in 'x2' mole of a solvent. The mole fraction of solute is approximately equal to
3. An ideal gas can be liquified, because
4. The rate of material __________ is zero in case of a steady state system.
5. A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the
6. Molar heat capacity of water in equilibrium with ice at constant pressure is
7. If pH value of a solution is 8, then its pOH value will be
8. The chemical nature of an element is independent of
9. The heat change for the reaction, C(s) + 2S(s) → CS2(l), is 104.2 kJ. It represents the heat of
10. 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)
11. Assuming that CO2 obeys perfect gas law, calculate the density of CO2 (in kg/m3) at 263°C and 2 atm.
12. One micron is equal to
13. Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to - 100°C is
14. Gases diffuse faster compared to liquids because of the reason that the liquid molecules
15. Equal masses of CH4 and H2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is
16. Which of the following is not a colligative property ?
17. Atoms of the same element, but of different masses are called
18. If pH value of an acidic solution is decreased from 5 to 2, then the increase in its hydrogen ion concentration is __________ times.
19. Kopp's rule is concerned with the calculation of
20. Density of carbon dioxide is __________ kg/Nm3.
21. In case of a ternery system involving two liquid components and a solute, the ratio of the concentration of the solute in the two phases at equilibrium is called the distribution co-efficient. The distribution co-efficient depends upon the
22. Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the
23. N2 content in a urea sample was found to be only 42%. What is the actual urea content of the sample ? (molecular weight of urea = 60)
24. Specific gravity on API scale is given by the relation(where, G = specific gravity at 15.5°C).