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Syllabus

explain the physical significance of van der waals parameter?

_{5}at 400K is fount to be 90. degree of dissociation of PCl_{5}will be??1)15.8%

2)13.6

3)14.25

4)90%

on what factors does the surface tension depends?

Why 2nd Electron Gain Enthalpy of oxygen is positive?

_{2}gas diffuses in 10 s. 100 mL of gas 'X' diffuses in 't' sec. Gas 'X' and time 't' can be:-a) H

_{2}, 2.5 sb) SO

_{2}, 16 sc) CO, 10 s

d) He, 4 s

_{2}H_{2}_{2}H_{6}_{3}H_{8}by sucking through a straw a student can reduce the pressure in his lungs to 750mm of mercury density=13.6gm/cm

^{3 }using the straw he can drink water from a glass upto a maximum depth ofa) 10cm b) 75cm 3) 13.6cm 4)1.36cm

Explain why liquids like ether and acetone are kept in cool places?

The drain cleaner, Drainex contains small bits of aluminium which react with caustic soda to produce dihydrogen. What volume of dihydrogen at 20C and one bar will be released when 0.15g of aluminium reacts?

a) N

_{2}(g)b) CH

_{4}(g)c) NH

_{3}(g)d) H

_{2}(g)DIFFERENCE BETWEEN REAL GAS AND IDEAL GAS (IN POINTS)

_{2}H_{4 }was exploded with 50 ml of O_{2}.The volume after explosion was 45 ml on shaking with NaOH solution only 15 ml O_{2}was left behind ,what were the volume of CO and C_{2}H_{4}in mixture?What will be the graph between log p and inverse of log v ?

Under what conditions do real gases show maximum deviation from ideal behaviour?

Help!

5 moles of SO2 and 5 moles of O2 are allowed to react. At equilibrium, it

a) P

_{1}=P_{2}=P_{3}b)P

_{1}>P_{2}>P_{3}c)P

_{3}>P_{2}>P_{1}d)Cannot be predicted

prove that PV=1/3 mNc

^{2}calculate the molecular diamter of He from its van der waal's constant b=24?? proper explanation reqd.!

the volume of a gas at 0 degree C and 700mm Pressure is 760 cc. the no. of molecules present in this volume is___?

Calculate the volume occupied by 2 mole of N

_{2}at 200K & 8.21 atm pressure, if P_{C}V_{C}/ RT_{C}= 3/8 and P_{r}V_{r}/ T_{r}.how many pi bonds & sigma bonds are there in napthalene? reply asap!!

boiling of a liquid cannot occur in a closed vessel.comment on the statement

EQUAL MASSES OF SO2, CH4, 02 ARE MIXED IN EMPTY CONTAINER AT 298 K , TOTAL PRESSURE IS 2.1 ATM . THE PARTIAL PRESSURE OF CH4 IN THE MIXTURE IS ??METHOD????1) 0.5 ATM2) 0.75 ATM3) 1.2 ATM4) 0.6 ATM

Q.15. At moderate pressures, the compressibility factor for a particular gas is given by

$Z=1+0.34P-\frac{170P}{T}$ ( P in bar and T in Kelvin)

Calculate the Boyle:s temperature of this gas. Report your answer after dividing by 25

Why rain drops are spherical ?

1)605.5 torr

2)685.5 torr

3)714.5 torr

4)720.1 torr

The Boyle's temperature of the gas is

(A) 298 K

(B) 170 K

x ml of H2 effuse through a hole in a container in 5 sec.the time taken for the effusionof same volume of the gas specified below under identical condition is

1.10s,He

2.20s,O

3.25s,CO

4.55s,CO2

what is STP and NTP???

reply soon :)

explain why o-hydroxy benzaldehyde is liquid at room temp. while p-hydroxy benzaldehyde is a high melting solid?

a certain gas takes 3 times as long to effuse out as helium.what will be its molecular mass?

(Q.)Calculate the pressure exerted by 1 mol of CO_{2 }at 273 K if the van der Waal’s constant ‘a’= 3.592 dm^{6}atm mol^{-}. Assume that the volume occupied by CO_{2}molecules is negligible._{0 }= Avogadro's number)a) $\frac{4V}{{N}_{0}}$ b) 4V c) $\frac{{N}_{0}}{4V}$ d) 4VN

_{0}A gaseous mixture contains oxygen and another unknown gas in the molar ratio 4:1 diffuses through a porous plug in 245 seconds. Under simillar conditions same volume of oxygen takes 220 seconds to diffuse. Find the molecular mass of the unknown gas.

_{1}molecules and the total kinetic energy at -123^{o}C is E1 ergs, Another sample of gas at 27^{o}C has total kinetic energy as 2E_{1}. Assuming gases to be ideal, the number of gas molecules in the second sample will be:- Kindly answer sir/mam.a) N

_{1}b) N

_{1}/2c) 2N

_{1}d) 4N

_{1}Q. Assuming that dry air contain 79 % ${N}_{2}$ and 21 % ${O}_{2}$ by volume, what is the density of moist air at 25$\xb0$C and 1.0 atm when the relative humidity is 60 %. The vapor pressure of water at 25$\xb0$C is 23.76 mm Hg.

Kindly answer sir/mam.

a) +1

b) -1

c) 1/T

d) 1/n

_{2}at 300 K ?a) 4578 J/mol

b) 3134 J/mol

c) 3741 J/mol

d) 4173 J/mol

Kindly answer sir/mam.

A mixture of hydrogen and oxygen at 1 bar pressure contains 20% by mass of Hydrogen .Calculate the partial pressure of hydrogen .

what should be the percentage increase in pressure for 5% decrease in volume?

What do you mean by

andNTP(normal temperature and pressure)STP(standard temperature and pressure)?Q. The total kinetic energy in joules of the molecules in 8 g of methane at 27$\xb0$C is

(1) 3741.30 J

(2) 935.3 J

(3) 1870.65 J

(4) 700 J

_{4},WHOSE 10.5 ml REQUIRES 9 ml OXYGEN FOR COMPLETE COMBUSTION?Can u explain me Liquefaction of Gases?

the weight of 1 mole of agas of density 0.1784g/L at NTP is ___?

why do gases show deviation from ideal behaviour?

16 ml of oxygen diffused through a porous partition in t seconds . what volume of carbon dioxide will diffuse in same time by volume

how to make a project on adulteration of food in chemistry ... what should be the contents of it?

_{2}end at which first flash of shown fume would be observed1)0.33 m

2) 0.11 m

3) 0.85 m

Why are vegetables cooked with difficulty at a hill station?why gases do not settle down at the bottom of the container when kept in it?

_{c}and p_{c}of gas are 400k and 41 atm resp. Vc isa balloon filled with an ideal gas is taken from the surface of the sea deep to a depth of 100m , what will be its volume in terms of its original volume?

a cylinder was filled with gaseous mixture containing CO N_{2}_{}(equal masses).The ratio of their partial pressure in cylinder are???what is the unit of the constants in van der waal's equation?

plzzzzzzzzz answer as soon as possible

Why Heavy water is used as moderators in nuclear reactions? And, can ordinary water act as moderators instead heavy water or not? If yes please or if no how and why?

(a) in which flask pressure is greater? how many times more?

(b) in which flask the number of collision with the walls are greater at the same temperature and why?

1)64

2) 80 3) 332

Q. A compressed cylinder of gas contains 1.50$\times {10}^{3}$ g of ${N}_{2}$ gas at a pressure of 2.0$\times {10}^{7}$ Pa and a temperature of 17.1$\xb0$C. What volume of gas has been released into the atmosphere if the final pressure in the cylinder is 1.80$\times {10}^{5}$ Pa? Assume ideal behaviour and that the gas temperature is unchanged.

(a) 1260 L

(b) 126 L

(c) 12600 L

(d) 45 L

What is Andrews Isotherm

at certain mixture of helium and argon weighing 5g occupies a volume of 10 l at 25 degreec and 1 atm pressur. wha t is the composition of the mixture in mass pecentage ?

_{2}is 16 at ntp. at what temperature its density will be 14?consider that the pressure remains constantWhat will be the minimum pressure required to compress 500 dm

^{3}of air at 1 bar to 200 dm^{3}at 30°C?Q.15 The respiration of the suspension of yeast cells was measured by observing the decrease in pressure of gas above the cell suspension. The apparatus show that the gas was confined to a constant volume, 16 ml and the entire pressure change

was caused by uptake of O

_{2}by the cells. The pressure was measured in a manometer, the fluid of which had a density of I .034 gm/ml. The entire apparatus was immersed in a thermostat at 37°C. In a 30 min. observation period the fluid in open side of manometer dropped 37 mm. neglecting the solubility of O_{2}in yeast suspension, compute rate of O_{2}consumed by the cells in It of O_{2}_{ }(S.T.P.) per hour.