Question is ⇒ During a phase change process like sublimation, vaporisation, melting etc., the specific __________ does not change., Options are ⇒ (A) enthalpy, (B) Gibbs free energy, (C) internal energy, (D) entropy, (E) , Leave your comments or Download question paper.

Question is ⇒ During a phase change process like sublimation, vaporisation, melting etc., the specific __________ does not change., Options are ⇒ (A) enthalpy, (B) Gibbs free energy, (C) internal energy, (D) entropy, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	During a phase change process like sublimation, vaporisation, melting etc., the specific __________ does not change.
A.	enthalpy [Wrong Answer]
B.	Gibbs free energy [Correct Answer]
C.	internal energy [Wrong Answer]
D.	entropy [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ The reaction A + B → C has been conducted in a reactor as shown bel
1
2
3
4

⇒ Pick out the wrong statement.
Ten times dilution of a normal solution (N) reduces its normality to N/10.
When equal weights of oxygen and methane are mixed in an empty reactor at room temperature, then the fraction of total pressure exerted by the oxygen is 1/2.
Volume occupied by 9.034 x 10²³ atoms of oxygen in ozone (O₃) at NTP will be 11200 c.c
One kg mole of an ideal gas at N.T.P occupies 22400 Nm³.

⇒ The vapour pressure of water is given by, in P_sat = A - (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K.The vapor pressure of water in atm. at 50°C is approximately
0.07
0.09
0.11
0.13

⇒ The molecular velocity of a real gas is proportional to (where, T = absolute temperature of the gas).
T
T
T²
1/T

⇒ Kinetic theory of gases stipulates that, the
energy is lost during molecular collisions.
molecules possess appreciable volume.
absolute temperature is a measure of the kinetic energy of molecules.
none of these.

⇒ Compressibility factor of a real gas is the ratio of the actual volume to that predicted by ideal gas law. As the pressure of the gas approaches zero, the compressibility factor approaches
∞
0
1
0.24

⇒ 80 kg of Na₂SO₄ (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na₂SO₄ .10H₂O crystals separate out. The weight fraction of Na₂SO₄ in the remaining solution is
0
0.18
0.24
1

⇒ A gas at 0°C is cooled at constant pressure until its volume becomes half the original volume. The temperature of the gas at this state will be
-136.5°C
- 136.5°K
-273°C
0°K

⇒ The percentage ratio of the partial pressure of the vapor to the vapor pressure of the liquid at the existing temperature is
termed as relative saturation.
not a function of the composition of gas mixture.
called percentage saturation.
not a function of the nature of vapor.

⇒ Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing ) ?
ΔH = 1 (+ ve)and Δ V = -ve
ΔH = 0
ΔV = 0
both (b) and (c)

⇒ With rise in temperature, the heat capacity of a substance
increases
decreases
remains unchanged
either (a) or (b); depends on the substance

⇒ Pick out the wrong unit conversion.
l kgf= 9.8 Newton.
1 stoke = 1 m²/second.
1 Pascal second = 10 poise.
1 ppm = 1 ml/m³ = 1 mg/kg.

⇒ Which of the following is an exothermic reaction ?
Conversion of graphite to diamond
Decomposition of water
Dehydrogenation of ethane to ethylene
none of these

⇒ The hydroxyl ion (OH^-) concentration in a solution having pH value 3 will be
10^-11
10^-10
10^-3
10^-4

⇒ The value of Trouton's ratio (λ_b/T_b) for a number of substances is 21 (where, λb = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and T_b = normal boiling point, °K). The Kis-tyakowsky equation is used for calculation of Trouton's ratio of __________ liquids.
polar
non-polar
both (a) & (b)
neither (a) nor (b)

⇒ With rise in temperature, the solubility of ammonia in water at a fixed pressure
increases
decreases
remains unchanged
increases exponentially

⇒ One kg of saturated steam at 100°C and 1.01325 bar is contained in a rigid walled vessel. It lias a volume of 1.673 m³. It cools to 98°C ; the saturation pressure is 0.943 bar ; one kg of water vapour under these conditions has a volume of 1.789 m³. The amount of water vapour condensed (in kg) is
0
0.065
0.1
1

⇒ Which of the following is not a unit of pressure ?
Torr
Newton/m²
Parsec
Ata, bar or pascal

⇒ A flowsheet is given in the following fig
300
400
500
600

⇒ Na₂SO₄. 10H₂O crystals are formed by cooling 100 Kg of 30% by weight aqueous solution of Na₂SO₄. The final concentration of the solute in the solution is 10%. The weight of crystals is
20
32.2
45.35
58.65

⇒ The effect of pressure on the heat capacity of the gases __________ is negligible.
at pressure below one atmosphere
below the critical temperature
both(a)&(b)
neither (a) nor (b)

⇒ In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality?
Use of equation of state
Fugacity co-efficient
Activity co-efficient
None of these

⇒ With increase in the solute concentration, the specific heat of aqueous solutions
increases
decreases
remains unchanged
either (a) or (b); depends on the type of solution

⇒ 'Giga' stands for
10⁹
10^-12
10¹²
10¹⁵

⇒ NaOH contains __________ percent oxygen.
1
10
16
40

⇒ PH value of a solution containing 1 gm of hydrogen ion per litre will be
0
1
7
10

⇒ Colligative properties of a dilute solution are those which depend entirely upon the
constitution of the solute.
chemical composition of the solute.
number of solute molecules contained in a given volume of the solvent.
none of these.

⇒ Elements in a periodic table are arranged in order of their
atomic number.
mass number.
atomic weight.
metallic characteristics.

⇒ An aqueous solution of 2.45% by weight H₂SO₄ has a specific gravity of 1.011. The composition expressed in normality is
0.25
0.2528
0.5
0.5055

⇒ In which of the following case of mixing of a strong acid with strong base (each of 1N concentration), temperature increase will be the highest ?
30 c.c acid and 30 c.c base.
20 c.c acid and 25 c.c base.
15 c.c acid and 35 c.c base.
35 c.c acid and 15 c.c base.