11242 + Mcqs in Chemistry Page 72 McqOptions

3551.	A vessel of volume 5 litres contains 1.4 g of nitrogen at a temperature 1800 K. The pressure of the gas if 30% of its molecules are dissociated into atoms at this temperature is
A.	4.05 atm
B.	2.025 atm
C.	3.84 atm
D.	1.92 atm
Answer» E.

Discussion

3552.	Dipole-dipole interaction energy between stationary polar molecules is proportional to x and that between rotating molecules is proportional to y. Assume distance between polar molecules as r, then x and y are
A.	\[\frac{1}{{{r}^{6}}},\frac{1}{{{r}^{3}}}\]
B.	\[\frac{1}{{{r}^{6}}},\frac{1}{{{r}^{6}}}\]
C.	\[\frac{1}{{{r}^{3}}},\frac{1}{{{r}^{3}}}\]
D.	\[\frac{1}{{{r}^{3}}},\frac{1}{{{r}^{6}}}\]
Answer» E.

Discussion

3553.	A balloon containing 1 mole air at 1 atm initially is filled further with air till pressure increases to 4 atm. The initial diameter of the balloon is 1 m and the pressure at each stage is proportion to diameter of the balloon. How many no. of moles of air added to change the pressure from 1 atm to 4 atm:
A.	80
B.	257
C.	255
D.	256
Answer» D. 256

Discussion

3554.	The rms speed of \[{{N}_{2}}\] molecules in a gas is \[u\]. If the temperature is doubled and the nitrogen molecules dissociate into nitrogen atoms, the rms speed becomes
A.	\[u/2\]
B.	\[2u\]
C.	\[4u\]
D.	\[14u\]
Answer» C. \[4u\]

Discussion

3555.	Two gases A and B present separately in two vessels X and Y at the same temperature with molecular weights M and 2M respectively are effused out. The orifice in vessel X is circular while that in Vis a square. If the radius of the circular orifice is equal to that of the length of the square orifice, the ratio of rates of effusion of gas A to that of gas B is
A.	\[\sqrt{2}\pi \]
B.	\[\sqrt{\frac{\pi }{2}}\]
C.	\[2\pi \]
D.	\[\sqrt{\frac{2}{\pi }}\]
Answer» B. \[\sqrt{\frac{\pi }{2}}\]

Discussion

3556.	The ratio among most probable velocity, mean velocity and root mean square velocity is given by
A.	\[1:2:3\]
B.	\[1:\sqrt{2}:\sqrt{3}\]
C.	\[\sqrt{2}:\sqrt{3}:\sqrt{8/\pi }\]
D.	\[\sqrt{2}:\sqrt{8/\pi }:\sqrt{3}\]
Answer» E.

Discussion

3557.	If Z is a compressibility factor, van der Waals equation at low pressure can be written as
A.	\[Z=1-\frac{Pb}{RT}\]
B.	\[Z=1+\frac{Pb}{RT}\]
C.	\[Z=1+\frac{RT}{Pb}\]
D.	\[Z=1-\frac{a}{VRT}\]
Answer» E.

Discussion

3558.	Positive deviation from ideal behaviour takes place because of
A.	The molecular interaction between atom and \[PV/nRT>1\]
B.	The molecular interaction between atom and \[PV/nRT<1\]
C.	The-finite size of atoms and \[PV/nRT>1\]
D.	The finite size of atoms and \[PV/nRT<1\]
Answer» B. The molecular interaction between atom and \[PV/nRT<1\]

Discussion

3559.	When the temperature increases, the surface tension of water
A.	Increases
B.	Decreases
C.	Remains constant
D.	Shows irregular behaviour
Answer» C. Remains constant

Discussion

3560.	In the van der Waals equation
A.	b is the volume occupied by the gas molecules
B.	b is four times the volume occupied by the gas molecules
C.	b is the correction factor for intermolecular attraction
D.	None of these
Answer» C. b is the correction factor for intermolecular attraction

Discussion

3561.	Relative humidity of air is \[60{}^\circ \] and the saturation vapour pressure of water vapour in air is 3.6 k Pa. The amount of water vapours present in 2 L air at 300 K is
A.	52 g
B.	31.2 g
C.	26 g
D.	5.2 g
Answer» C. 26 g

Discussion

3562.	A gas obeys P(V - b) = RT. Which of the following is correct about this gas?I. Isochoric curves have slope =\[\frac{V-b}{R}\]II. sobaric curves have slope \[\frac{R}{P}\] and intercept b.III. For the gas, compressibility factor = \[1+\frac{Pb}{RT}\]IV. The attraction forces are overcome by repulsive forces.
A.	I
B.	II, III, IV
C.	III
D.	I, II, III, IV
Answer» C. III

Discussion

3563.	At what temperature will the total KE of 0.3 mol of He be the same as the total KE of 0.40 mol of Ar at 400 K?
A.	533 K
B.	400 K
C.	346
D.	300 K
Answer» B. 400 K

Discussion

3564.	Total pressure of a mixture of \[{{H}_{2}}\] and \[{{O}_{2}}\] is 1.00 bar. The mixture is allowed to react to form water, which is completely removed to leave only pure \[{{H}_{2}}\] at a pressure of 0.35 bar. Assuming ideal gas behaviour and that all pressure measurements were made under the same temperature and volume conditions, the composition of the original mixture is
A.	\[{{X}_{{{H}_{2}}}}\]\[{{X}_{{{O}_{2}}}}\]0.500.50
B.	\[{{X}_{{{H}_{2}}}}\]\[{{X}_{{{O}_{2}}}}\]0.220.78
C.	\[{{X}_{{{H}_{2}}}}\]\[{{X}_{{{O}_{2}}}}\]0.780.22
D.	\[{{X}_{{{H}_{2}}}}\]\[{{X}_{{{O}_{2}}}}\]0.350.65
Answer» D. \[{{X}_{{{H}_{2}}}}\]\[{{X}_{{{O}_{2}}}}\]0.350.65

Discussion

3565.	Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is
A.	0.44 mol \[k{{g}^{-1}}\]
B.	1.14 mol \[k{{g}^{-1}}\]
C.	3.28 mol \[k{{g}^{-1}}\]
D.	2.28 mol \[k{{g}^{-1}}\]
Answer» E.

Discussion

3566.	For the reaction \[2x+3y+4z\to 5w\] Initially if 1 mole of x, 3 moles of y and 4 moles of z is taken. If 1.25 moles of w is obtained then % yield of this reaction is
A.	50%
B.	0.6
C.	70%
D.	0.4
Answer» B. 0.6

Discussion

3567.	Which of the following changes with increase in Temperature?
A.	Molality
B.	Weight fraction of solute
C.	Fraction of solute present in water
D.	Mole fraction
Answer» D. Mole fraction

Discussion

3568.	The minimum quantity in gram of \[{{H}_{2}}S\] needed to precipitate 63.5 g of \[C{{u}^{{{2}^{+}}}}\] will be \[(C{{u}^{{{2}^{+}}}}+{{H}_{2}}S\to C{{u}_{2}}S+{{H}_{2}})\] Black
A.	63.5 g
B.	31.75 g
C.	34 g
D.	2 g
Answer» D. 2 g

Discussion

3569.	A gaseous mixture contains \[C{{O}_{2}}(g)\] and \[{{N}_{2}}O(g)\] in 2 : 5 ratio by mass. The ratio of the number of molecules of \[C{{O}_{2}}(g)\]and \[{{N}_{2}}O(g)\]is
A.	5:2
B.	0.0868055555555556
C.	1 : 2
D.	0.211111111111111
Answer» C. 1 : 2

Discussion

3570.	How many litre of 2 M \[{{H}_{3}}As{{o}_{4}}\] require to prepare 4 litres of l M \[{{H}_{3}}As{{o}_{4}}\]?
A.	0
B.	6
C.	8
D.	2
Answer» E.

Discussion

3571.	29.2 % (w/w) HCl stock solution has density of 1.25 g \[m{{L}^{-1}}\]. The molecular weight of HCl is 36.5 g \[mo{{l}^{-1}}\]. The volume (mL) of stock solution required to prepare a 200 mL solution of 0.4 M HCl is
A.	6
B.	5
C.	3
D.	8
Answer» E.

Discussion

3572.	How many \[{{N}_{4}}\] electron is present in 5.1 g \[N{{H}_{3}}\] ?
A.	1
B.	2
C.	3
D.	4
Answer» D. 4

Discussion

3573.	A student performs a titration with different burettes and finds titre values of 25.2 mL, 25.25 ml and 25.0 mL. The number of significant figures in the average titre value is
A.	3
B.	4
C.	5
D.	6
Answer» B. 4

Discussion

3574.	Irrespective of the source, pure sample of water always yields 88.89% mass of oxygen and 11.11% mass of hydrogen. This is explained by the law of
A.	Conservation of mass
B.	Constant composition
C.	Multiple proportions
D.	Constant volume
Answer» C. Multiple proportions

Discussion

3575.	The percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (atomic weight = 78.4). Then minimum molecular weight of peroxidase anhydrous enzyme is
A.	\[15.68\]
B.	\[1.568\times {{10}^{3}}\]
C.	\[1.568\times {{10}^{4}}\]
D.	\[3.136\times {{10}^{4}}\]
Answer» D. \[3.136\times {{10}^{4}}\]

Discussion

3576.	Given that the abundance of isotopes \[^{54}Fe\], \[^{56}Fe\] and \[^{57}Fe\] is 5%, 90% and 5%, respectively. The atomic mass of Fe is
A.	55.85
B.	55.95
C.	55.75
D.	55.05
Answer» C. 55.75

Discussion

3577.	A sample of pure carbon dioxide, irrespective of its source contains 27.27% carbon and 72.73% oxygen. The data support
A.	Law of constant composition
B.	Law of conservation of mass
C.	Law of reciprocal proportions
D.	Law of multiple proportions
Answer» B. Law of conservation of mass

Discussion

3578.	\[Br{{O}_{3}}^{\odot }+5B{{r}^{\odot }}\to B{{r}_{2}}+3{{H}_{2}}O\]If 50 mL 0.1 M \[Br{{O}_{3}}^{\odot }\] is mixed with 30 mL of 0.5 M \[B{{r}^{\Theta }}\]solution that contains excess of \[{{H}^{\oplus }}\] ions, the moles of \[B{{r}_{2}}\] formed are
A.	\[6.0\times {{10}^{-4}}\]
B.	\[1.2\times {{10}^{-4}}\]
C.	\[9.0\times {{10}^{-3}}\]
D.	\[1.8\times {{10}^{-3}}\]
Answer» D. \[1.8\times {{10}^{-3}}\]

Discussion

3579.	Mole fraction of ethanol in ethanol water mixture is 0.25. Hence, the percentage concentration of ethanol by weight of mixture is
A.	25%
B.	0.75
C.	46%
D.	0.54
Answer» D. 0.54

Discussion

3580.	The simplest formula of a compound containing 50% of an element X (atomic weight 10) and 50% of element Y (atomic weight 20) is:
A.	\[XY\]
B.	\[{{X}_{2}}Y\]
C.	\[{{X}_{{}}}{{Y}_{2}}\]
D.	\[{{X}_{2}}{{Y}_{3}}\]
Answer» C. \[{{X}_{{}}}{{Y}_{2}}\]

Discussion

3581.	If 0.5 mole of \[BaC{{l}_{2}}\]is mixed with 0,20 mole of \[N{{a}_{3}}P{{O}_{4}}\], the maximum number of moles of\[B{{a}_{3}}(P{{O}_{4}})\] that can be formed is
A.	0.1
B.	0.2
C.	0.5
D.	0.7
Answer» B. 0.2

Discussion

3582.	1.0 g of a monobasic acid when completely acted upon Mg gave 1.301 g of anhydrous Mg salt. Equivalent weight of acid is
A.	35.54
B.	36.54
C.	17.77
D.	18.27
Answer» C. 17.77

Discussion

3583.	To neutralize completely 20 mL of 0.l M aqueous solution of phosphorus (\[{{H}_{3}}P{{O}_{3}}\]) acid the volume of 0.1 M aqueous KOH solution required is
A.	60 mL
B.	20 mL
C.	40 mL
D.	10 mL
Answer» D. 10 mL

Discussion

3584.	A gaseous hydrocarbon gives upon combustion, 0.72 g of water and 3.08 g of \[C{{O}_{2}}\] The empirical formula of the hydrocarbon is
A.	\[{{C}_{2}}{{H}_{4}}\]
B.	\[{{C}_{3}}{{H}_{4}}\]
C.	\[{{C}_{6}}{{H}_{5}}\]
D.	\[{{C}_{7}}{{H}_{8}}\]
Answer» E.

Discussion

3585.	X and Y are two elements which form \[{{X}_{2}}{{Y}_{3}}\] and \[{{X}_{3}}{{Y}_{4}}\]. If 0.20 mol of \[{{X}_{2}}{{Y}_{3}}\] weighs 32.0 g and 0.4 mol of \[{{X}_{3}}{{Y}_{4}}\] weighs 92.8 g, the atomic weights of \[X\] and\[Y\] Fare respectively
A.	16.0 and 56.0
B.	8.0 and 28.0
C.	56.0 and 16.0
D.	28.0 and 8.0
Answer» D. 28.0 and 8.0

Discussion

3586.	How many grams of sucrose (M. wt. = 342) should be dissolved in 100 g water in order to produce a solution with a \[105.0{}^\circ C\] difference between the boiling point and the freezing temperatures? \[({{K}_{f}}=\text{ }1.86\text{ }C\text{/}m,\,\,{{K}_{b}}=0.51{}^\circ C\text{/}m)\]
A.	34.2 g
B.	72 g
C.	342 g
D.	460 g
Answer» C. 342 g

Discussion

3587.	The vapour pressure of n-hexane at 350 K is 840 torr and that of cyclohexane is 600 torr. Mote fraction of hexane in the mixture that boils at 350 K and 1 atm pressure assuming ideal behaviour is
A.	0.67
B.	0.8
C.	0.50
D.	2.2
Answer» B. 0.8

Discussion

3588.	A current of dry air is passed through a bulb containing 5 g of a solute in 100 g of water and then through water alone. The losses in weight of the solution and pure water were respectively 0.78 g and 0.02 g. Calculate relative lowering of vapour pressure.
A.	2.04
B.	1.05
C.	0.03
D.	0.09
Answer» D. 0.09

Discussion

3589.	An ideal mixture of liquids A and B with 2 moles of A and 2 moles of B has a total vapour pressure of 1 atm at a certain temperature. Another mixture with 1 mole of A and 3 moles of B has a vapour pressure greater than 1 atm. But if 4 moles of C are added to the second mixture, the vapour pressure comes down to 1 atm. Vapour pressure of C, \[P_{c}^{0}\]=0.8 atm. Calculate the vapour pressures of pure A and pure B
A.	\[P_{A}^{o}\]=1.4 atm, \[P_{B}^{o}\]=0.7 atm
B.	\[P_{A}^{o}\]=1.2atm, \[P_{B}^{o}\]=0.6atm
C.	\[P_{A}^{o}\]=1.4atm, \[P_{B}^{o}\]=0.6atm
D.	\[P_{A}^{o}\]= 0.6 atm, \[P_{B}^{o}\]= 1.4 atm
Answer» E.

Discussion

3590.	Out of the following liquid pair which solution follows the positive deviation from Raoult's law?
A.	Acetone + Chloroform
B.	Water + Nitric acid
C.	Water + Hydrochloric acid
D.	Benzene + Methanol
Answer» E.

Discussion

3591.	Henry's law constant for \[{{N}_{2}}\] at 310 K is 82.35 kbar. \[{{N}_{2}}\] exerts a partial pressure of 0.840 bar. If \[{{N}_{2}}\] gas is bubbled through water at 293 K, then the number of millimoles of \[{{N}_{2}}\] that will dissolve in 1 L of water is
A.	\[0.0716\]
B.	\[1.30\times {{10}^{-5}}\]
C.	\[1.25\times {{10}^{-2}}\]
D.	0.0555
Answer» E.

Discussion

3592.	The degree of dissociation (1) of a weak electrolyte \[{{A}_{x}}{{B}_{y}}\] is related to van't Hoff factor (i) by the expression
A.	\[\alpha =\frac{i-1}{(x+y-1)}\]
B.	\[\alpha =\frac{i-1}{x+y+1}\]
C.	\[\alpha =\frac{x+y-1}{i-1}\]
D.	\[\alpha =\frac{x+y+1}{i-1}\]
Answer» B. \[\alpha =\frac{i-1}{x+y+1}\]

Discussion

3593.	In a mixture of A and B, components show -ve deviations as,
A.	\[\Delta {{V}_{mix}}\,\text{is}+ve\]
B.	\[A-B\] interaction is weaker than \[A-A\] and \[B-B\] interaction
C.	\[\Delta {{H}_{mix}}\,\text{is}+ve\]
D.	A-B interaction is stronger than \[A-A\] and \[B-B\] interaction
Answer» E.

Discussion

3594.	The degree of dissociation of \[Ca{{(N{{O}_{3}})}_{2}}\] in a dilute solution containing 14 g of the salt per 200 g of water at \[100{}^\circ C\]is 70%. If the vapour pressure of water is 760 mmHg, calculate the vapour pressure of solution.
A.	750.6 mmHg
B.	755.8 mmHg
C.	745.98 mmHg
D.	739.56 mmHg
Answer» D. 739.56 mmHg

Discussion

3595.	A living cell contains a solution which is isotonic with 0.3 (M) sugar solution. What osmotic pressure develops when the cell is placed in 0.1 (M) KCl solution at body temperature?
A.	5.08 atm
B.	2.54 atm
C.	4.92 atm
D.	2.46 atm
Answer» C. 4.92 atm

Discussion

3596.	Phenol associates in benzene to a certain extent to form a dimer. A solution containing \[20\times {{10}^{-3}}\] kg of phenol in 1.0 kg-of benzene has its freezing point depressed by 0.69 K. Calculate the fraction of phenol that has dimerised. (\[{{K}_{f}}\]for benzene = 5.12 K kg \[mo{{l}^{-1}}\])
A.	28.5%
B.	0.326
C.	73.3%
D.	0.82
Answer» D. 0.82

Discussion

3597.	Freezing point of a biological fluid is \[-0.60{}^\circ C\]in aqueous solution \[{{K}_{f}}({{H}_{2}}O)=\text{ }1.86{}^\circ mo{{l}^{-}}~kg.\] Thus, its osmotic pressure at 310 K is (assume molarity = molality)
A.	0.0766 atm
B.	7.66 atm
C.	0.766 atm
D.	8.19 atm
Answer» E.

Discussion

3598.	Solute A is a ternary electrolyte and solute B is non-electrolyte. If 0.1 M solution of solute B produces an osmotic pressure of 2P, then 0.05 M solution of A at the same temperature will produce an osmotic pressure equal to:
A.	P
B.	1.5P
C.	IP
D.	3P
Answer» E.

Discussion

3599.	The cryoscopic constant for acetic acid is 3.6 K kg/mol. A solution of 1 g of a hydrocarbon in 100 g of acetic acid freezes at \[16.14{}^\circ C\]instead of the usual\[16.60{}^\circ C\]. The hydrocarbon contains 92.3% carbon. What is the'molecular formula?
A.	\[{{C}_{6}}{{H}_{6}}\]
B.	\[{{C}_{6}}{{H}_{12}}\]
C.	\[{{C}_{8}}{{H}_{18}}\]
D.	\[{{C}_{10}}{{H}_{6}}\]
Answer» B. \[{{C}_{6}}{{H}_{12}}\]

Discussion

3600.	Which of the given aqueous solution has the maximum boiling point? \[({{K}_{b}}\,of\,{{H}_{2}}O)=0.52{}^\circ \,mo{{l}^{-1}}kg),\,{{T}_{b}}({{H}_{2}}O)=373K)\]
A.	6% urea solution by weight of solution
B.	18% glucose solution by weight of solution
C.	34.2% sucrose solution by weight of solution
D.	All have equal boiling points
Answer» D. All have equal boiling points

Discussion

Explore topic-wise MCQs in Joint Entrance Exam - Main (JEE Main).

A vessel of volume 5 litres contains 1.4 g of nitrogen at a temperature 1800 K. The pressure of the gas if 30% of its molecules are dissociated into atoms at this temperature is

Dipole-dipole interaction energy between stationary polar molecules is proportional to x and that between rotating molecules is proportional to y. Assume distance between polar molecules as r, then x and y are

The rms speed of \[{{N}_{2}}\] molecules in a gas is \[u\]. If the temperature is doubled and the nitrogen molecules dissociate into nitrogen atoms, the rms speed becomes

The ratio among most probable velocity, mean velocity and root mean square velocity is given by

If Z is a compressibility factor, van der Waals equation at low pressure can be written as

Positive deviation from ideal behaviour takes place because of

When the temperature increases, the surface tension of water

In the van der Waals equation

Relative humidity of air is \[60{}^\circ \] and the saturation vapour pressure of water vapour in air is 3.6 k Pa. The amount of water vapours present in 2 L air at 300 K is

At what temperature will the total KE of 0.3 mol of He be the same as the total KE of 0.40 mol of Ar at 400 K?

Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is

For the reaction \[2x+3y+4z\to 5w\] Initially if 1 mole of x, 3 moles of y and 4 moles of z is taken. If 1.25 moles of w is obtained then % yield of this reaction is

Which of the following changes with increase in Temperature?

The minimum quantity in gram of \[{{H}_{2}}S\] needed to precipitate 63.5 g of \[C{{u}^{{{2}^{+}}}}\] will be \[(C{{u}^{{{2}^{+}}}}+{{H}_{2}}S\to C{{u}_{2}}S+{{H}_{2}})\] Black

A gaseous mixture contains \[C{{O}_{2}}(g)\] and \[{{N}_{2}}O(g)\] in 2 : 5 ratio by mass. The ratio of the number of molecules of \[C{{O}_{2}}(g)\]and \[{{N}_{2}}O(g)\]is

How many litre of 2 M \[{{H}_{3}}As{{o}_{4}}\] require to prepare 4 litres of l M \[{{H}_{3}}As{{o}_{4}}\]?

29.2 % (w/w) HCl stock solution has density of 1.25 g \[m{{L}^{-1}}\]. The molecular weight of HCl is 36.5 g \[mo{{l}^{-1}}\]. The volume (mL) of stock solution required to prepare a 200 mL solution of 0.4 M HCl is

How many \[{{N}_{4}}\] electron is present in 5.1 g \[N{{H}_{3}}\] ?

A student performs a titration with different burettes and finds titre values of 25.2 mL, 25.25 ml and 25.0 mL. The number of significant figures in the average titre value is

Irrespective of the source, pure sample of water always yields 88.89% mass of oxygen and 11.11% mass of hydrogen. This is explained by the law of

The percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (atomic weight = 78.4). Then minimum molecular weight of peroxidase anhydrous enzyme is

Given that the abundance of isotopes \[^{54}Fe\], \[^{56}Fe\] and \[^{57}Fe\] is 5%, 90% and 5%, respectively. The atomic mass of Fe is

A sample of pure carbon dioxide, irrespective of its source contains 27.27% carbon and 72.73% oxygen. The data support

\[Br{{O}_{3}}^{\odot }+5B{{r}^{\odot }}\to B{{r}_{2}}+3{{H}_{2}}O\]If 50 mL 0.1 M \[Br{{O}_{3}}^{\odot }\] is mixed with 30 mL of 0.5 M \[B{{r}^{\Theta }}\]solution that contains excess of \[{{H}^{\oplus }}\] ions, the moles of \[B{{r}_{2}}\] formed are

Mole fraction of ethanol in ethanol water mixture is 0.25. Hence, the percentage concentration of ethanol by weight of mixture is

The simplest formula of a compound containing 50% of an element X (atomic weight 10) and 50% of element Y (atomic weight 20) is:

If 0.5 mole of \[BaC{{l}_{2}}\]is mixed with 0,20 mole of \[N{{a}_{3}}P{{O}_{4}}\], the maximum number of moles of\[B{{a}_{3}}(P{{O}_{4}})\] that can be formed is

1.0 g of a monobasic acid when completely acted upon Mg gave 1.301 g of anhydrous Mg salt. Equivalent weight of acid is

To neutralize completely 20 mL of 0.l M aqueous solution of phosphorus (\[{{H}_{3}}P{{O}_{3}}\]) acid the volume of 0.1 M aqueous KOH solution required is

A gaseous hydrocarbon gives upon combustion, 0.72 g of water and 3.08 g of \[C{{O}_{2}}\] The empirical formula of the hydrocarbon is

X and Y are two elements which form \[{{X}_{2}}{{Y}_{3}}\] and \[{{X}_{3}}{{Y}_{4}}\]. If 0.20 mol of \[{{X}_{2}}{{Y}_{3}}\] weighs 32.0 g and 0.4 mol of \[{{X}_{3}}{{Y}_{4}}\] weighs 92.8 g, the atomic weights of \[X\] and\[Y\] Fare respectively

How many grams of sucrose (M. wt. = 342) should be dissolved in 100 g water in order to produce a solution with a \[105.0{}^\circ C\] difference between the boiling point and the freezing temperatures? \[({{K}_{f}}=\text{ }1.86\text{ }C\text{/}m,\,\,{{K}_{b}}=0.51{}^\circ C\text{/}m)\]

The vapour pressure of n-hexane at 350 K is 840 torr and that of cyclohexane is 600 torr. Mote fraction of hexane in the mixture that boils at 350 K and 1 atm pressure assuming ideal behaviour is

A current of dry air is passed through a bulb containing 5 g of a solute in 100 g of water and then through water alone. The losses in weight of the solution and pure water were respectively 0.78 g and 0.02 g. Calculate relative lowering of vapour pressure.

Out of the following liquid pair which solution follows the positive deviation from Raoult's law?

Henry's law constant for \[{{N}_{2}}\] at 310 K is 82.35 kbar. \[{{N}_{2}}\] exerts a partial pressure of 0.840 bar. If \[{{N}_{2}}\] gas is bubbled through water at 293 K, then the number of millimoles of \[{{N}_{2}}\] that will dissolve in 1 L of water is

The degree of dissociation (1) of a weak electrolyte \[{{A}_{x}}{{B}_{y}}\] is related to van't Hoff factor (i) by the expression

In a mixture of A and B, components show -ve deviations as,

The degree of dissociation of \[Ca{{(N{{O}_{3}})}_{2}}\] in a dilute solution containing 14 g of the salt per 200 g of water at \[100{}^\circ C\]is 70%. If the vapour pressure of water is 760 mmHg, calculate the vapour pressure of solution.

A living cell contains a solution which is isotonic with 0.3 (M) sugar solution. What osmotic pressure develops when the cell is placed in 0.1 (M) KCl solution at body temperature?

Phenol associates in benzene to a certain extent to form a dimer. A solution containing \[20\times {{10}^{-3}}\] kg of phenol in 1.0 kg-of benzene has its freezing point depressed by 0.69 K. Calculate the fraction of phenol that has dimerised. (\[{{K}_{f}}\]for benzene = 5.12 K kg \[mo{{l}^{-1}}\])

Freezing point of a biological fluid is \[-0.60{}^\circ C\]in aqueous solution \[{{K}_{f}}({{H}_{2}}O)=\text{ }1.86{}^\circ mo{{l}^{-}}~kg.\] Thus, its osmotic pressure at 310 K is (assume molarity = molality)

Solute A is a ternary electrolyte and solute B is non-electrolyte. If 0.1 M solution of solute B produces an osmotic pressure of 2P, then 0.05 M solution of A at the same temperature will produce an osmotic pressure equal to:

The cryoscopic constant for acetic acid is 3.6 K kg/mol. A solution of 1 g of a hydrocarbon in 100 g of acetic acid freezes at \[16.14{}^\circ C\]instead of the usual\[16.60{}^\circ C\]. The hydrocarbon contains 92.3% carbon. What is the'molecular formula?

Which of the given aqueous solution has the maximum boiling point? \[({{K}_{b}}\,of\,{{H}_{2}}O)=0.52{}^\circ \,mo{{l}^{-1}}kg),\,{{T}_{b}}({{H}_{2}}O)=373K)\]