311. Mass number of an atom is the sum of the numbers of
Neutrons and protons
Protons and electrons
Neutrons and electrons
Both A & B
✅ The correct answer is option D.
Statiometery MCQs
312. At a temperature of 0°K, the molecules of a gas have only __________ energy.
Rotational
Vibrational
Translational
None of these
✅ The correct answer is option C.
313. A gas occupies a volume of 283 c.c at 10°C. If it is heated to 20°C at constant pressure, the new volume of the gas will be __________ c.c.
283
566
293
141.5
✅ The correct answer is option C.
314. Vapor pressure of a solution is proportional to(where, Sv and St are mole fraction of solvent and solute respectively).
Sv
1/St
St
1/Sv
✅ The correct answer is option A.
315. Pick out the wrong unit conversion of temperature.
°R = 273 + °F
Temperature difference of 1°K = 1°C = 9/5 °F
°C = (F- 32) x 0.555
°F = (°C + 17.778) x 1.8
✅ The correct answer is option A.
316. In a chemical process, the recycle stream is purged for
Increasing the product yield
Enriching the product
Limiting the inerts
Heat conservation
✅ The correct answer is option C.
317. For most salts, the solubility increases with rise in temperature, but the solubility of __________ is nearly independent of temperature rise.
Sodium chloride
Sodium carbonate monohydrate
Anhydrous sodium sulphate
Hypo
✅ The correct answer is option A.
318. According to Raoult’s law, “The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component.” Raoult’s law is not applicable under the following assumption/condition.
No component is concentrated at the surface of the solution
The component molecules are non polar and are of almost equal size
In the formation of solution, chemical combination/molecular association between unlike molecules takes place
The attractive forces between like and unlike molecules are almost equal
✅ The correct answer is option C.
319. If pH value of an acidic solution is decreased from 5 to 2, then the increase in its hydrogen ion concentration is __________ times.
10
100
1000
10000
✅ The correct answer is option C.
320. For any system, the __________ heat of solution is dependent on the temperature and the adsorbate concentration.
Integral
Differential
Both A & B
Neither A nor B
✅ The correct answer is option C.