a. Different gases have different KH values at the same tempertaure. b. The value of KH increases with increases of temperature and KH is function of the nature of the gas c. The partial pressure of the gas in vapour …
(a) It will remain on it as a sphere (b) It will spread as a thin layer (c) It will be partly as spherical droplets and partly as thin film (d) It will float as a distorted drop on the …
a. He b. O2 c. NH3 d. CO2 Ans. a Explanation : As the value of Henry’s law constant increases, the solubility of gas decreases. (13)
(a) Increases (b) Decreases (c) Remains the same (d) Increases then decreases Ans. b (12)
(a) Chemicals of soap change (b) It increases the surface tension of the solution (c) It absorbs the dirt (d) It lowers the surface tension of the solution Ans. (d) Soap helps to lower the surface tension of solution, thus …
a. Temperature b. Nature of solute c. Pressure d. Nature of solvent Ans. c Explanation : Maximum amount of solid that can be dissolved in a specified amount of given solvent does not depend upon pressure. This is because solid …
(a) Surface tension of the liquid (b) Density of liquid (c) Viscosity of liquid (d) Temperature of air only Ans. d (102)
a. Saturated b. Supersaturated c. Unsaturated d. Concentrated Ans. b Explanation : when solute is added to the solution three cases my arise: i. It dissolves into solution then solution is unsaturated ii. It does not dissolve in the solution …
(a) Surface tension of the liquid (b) Density of liquid (c) Viscosity of liquid (d) Temperature of air only Ans. a (60)
a. Less than the rate of crystallisation b. Greater than the rate of crystallisation c. Equal to the rate of crystallisation d. Zero Ans. c Explanation : At equilibrium the rate of dissolution of solid in a volatile liquid solvent …
a. Normal b. High c. Low d. Cannot say Ans. a (23)
(a) Frictional forces between molecules (b) Cohesive forces between molecules (c) Adhesive forces between molecules (d) Gravitational forces Ans. b (15)
a. 0. 555 b. 5.55 c. 0.0555 d. 55.5 e. 5. 55 x 10-4 Ans. a (11)
a. H2 b. N2 c. CH4 d. CO2 e. Ar Ans. d Explanation : CO2 reacts with water and therefore is high soluble in water. So it greatly deviates from Henry’s law in water. (180)
a. The solute dissolve b. The excess solutes crystallizes out c. The solution becomes unsaturated d. The solution remains super saturated Ans. b Explanation : In supersaturated solution, more solute is present than the necessary amount to saturate the solution …
a. Interstitial defect b. Schottky defect c. Frenkel defect d. Frenkel and schottky defect Ans. b (18)
(a) Density of the liquid (b) Surface tension (c) Atmospheric pressure (d) Gravity Ans. b (12)
N2 gas in water at 298 K is 1.0 x 10 5 atm. The mole fraction of N2 in air is 0.8. The number of moles of N2 form air dissolved in 10 moles of water at 298 K and 5 atm …
(a) Zero (b) Infinite (c) Between 0 and ∞ (d) Can not be determined Ans. a (13)
K H is …….. a. Greater for gases with higher solubility b. Greater for gases with lower solubility c. Constant for all gases d. Not related to the solubility of gases Ans. b (9)
KH ………… a. Increases with increase in temperature b. Decrease with increase in temperature c. Remains constant d. First increase then decrease Ans. a Explanation : Value of Henry’s constant increases with creases in temperature representing the decreases in solubility (18)
a. Sugar crystals in cold water b. Sugar crystals in hot water c. Powered sugar in cold water d. Powered sugar in hot water Ans. d Explanation : Dissolution of sugar in water will be most rapid when powered sugar …
a. Mole fraction b. Parts per million c. Mass percentage d. Molality Ans.a (4)
O2 and C2 H2 gases are respectively at 25° C as 58 x 103 , 43 x 103 , 1.61 x 103 and 1.34 x 103 . The solubility of these gases decreases in the order a. CO > O2 …
16.The length of a rod is 20 cm and area of cross-section 2 cm2 . The Young’s modulus of the material of wire is 1.4×1011 N/m2 . If the rod is compressed by 5 kg-wt along its length, then increase …
a. Air b. Brass c. Amalgam d. Benzene in water Ans. d Explanation : Benzene can’t be dissolved in water and not form a true solution. (14)
a. The gas in contact with the liquid should behave as an ideal gas b. There should not be any chemical interaction between the gas and liquid c. The pressure applied should be high d. All of these Ans. b …
(a) 3 : 2 (b) 2 : 3 (c) 3 : 4 (d) 4 : 3 Answer-a (23)
(a) √(2E)/Y (b) √(2E) (c) EY …
a. Dalton’s Law of Partial pressures b. Law of Mass Action c. Henry’s Law d. None of these Ans. c (15)
a. Nature of the gas b. Temperature c. Pressure of the gas d. All of the above Ans. d (8)
(a) 0.01 J (b) 0.02 J (c) 0.04 J (d) 1.00 J Answer-a (37)
a. If both assertion and reason are true and the reason is the correct explanation of the assertion b. If both assertion and reason are true but reason is not the correct explanation of the assertion c. If assertion is …
106 Schottky pairs per cm3 at room temperature. a. If both assertion and reason are true and the reason is the correct explanation of the assertion b. If both assertion and reason are true but reason is not the correct …
a. If both assertion and reason are true and the reason is the correct explanation of the assertion b. If both assertion and reason are true but reason is not the correct explanation of the assertion c. If assertion is …
a. FeO0.98 has non stoichiometric metal deficiency defect b. Density decreases in case of crystals with Schottky’s defect c. NaCl is insulator silicon is semiconductor silver conductor quartz is piezo electric crystal d. Frenkel defect is favoured in those ionic …
10. A brass rod of cross-sectional area 1cm2 and length 0.2 m is compressed lengthwise by a weight of 5 kg. If Young’s modulus of elasticity of brass is 1×1011 N/m2 and g=10 m/sec2 , then increase in the energy of …
(a) Converts into kinetic energy (b) Converts into heat energy (c) Remains as potential energy (d) None of the above Answer-b (9)