Select Board & Class
explain the physical significance of van der waals parameter?
on what factors does the surface tension depends?
why gases do not settle down at the bottom of the container when kept in it?
Why 2nd Electron Gain Enthalpy of oxygen is positive?
by sucking through a straw a student can reduce the pressure in his lungs to 750mm of mercury density=13.6gm/cm3 using the straw he can drink water from a glass upto a maximum depth of
a) 10cm b) 75cm 3) 13.6cm 4)1.36cm
Strongest Base --
Be(OH)2 , Mg(OH)2 , Al(OH)3 , Si(OH)4
Why?
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?
DIFFERENCE BETWEEN REAL GAS AND IDEAL GAS (IN POINTS)
What will be the graph between log p and inverse of log v ?
nitric acid avery important industrial chemical.,is made by dissolving the gas NOx,in water. calculate the formula of gas,if at 1.24 atm and 50C density of gas is 2.15g/L.
Relationship between different types of speeds:cmp:cav:crms::1:1.128:1.224cav= 0.9213crmscrms= 1.086cavcmp= 0.816crms
prove that PV=1/3 mNc2
in the space between two stars, the temperature of a gas cloud is 12K and the density of hte gas is 1.2 x10-17 atom/m3. the absolute pressure of the gas is ?????
the volume of a gas at 0 degree C and 700mm Pressure is 760 cc. the no. of molecules present in this volume is___?
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
Why rain drops are spherical ?
how do we do hybridisation for hcooh
explain why o-hydroxy benzaldehyde is liquid at room temp. while p-hydroxy benzaldehyde is a high melting solid?
DIFFERENCE BETWEEN VAPOUR PRESSURE 7 SURFACE TENSION
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
Out of CO2 and NH3, which gas is expected to show more deviation from ideal behaviour?
Help :o
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.
(Q.) Calculate the pressure exerted by 1 mol of CO2 at 273 K if the van der Waal’s constant ‘a’= 3.592 dm6atm mol-. Assume that the volume occupied by CO2 molecules is negligible.
Calculate the pressure of 1x10 to the power 22 molecules of oxygen gas when enclosed in a vessel of 5L capacity at temp of 27 degree Celcius.
(Ans=0.817 atm)
Help please!
what is STP and NTP???
reply soon :)
a certain gas takes 3 times as long to effuse out as helium.what will be its molecular mass?
what should be the percentage increase in pressure for 5% decrease in volume?
when salt or sugar are poured into different kinds of vessels why do they take the shape of the vessel?
i. Which type of intermolecular forces exist between NaCl and H2O
ii. What will be the pressure of the gaseous mixture when 0.5 L of H2 at 0.8 bar and 2.0 L of O2 at 0.7 bar are introduced in a 1 L vessel at 27C?
A mixture of hydrogen and oxygen at 1 bar pressure contains 20% by mass of Hydrogen .Calculate the partial pressure of hydrogen .
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?
what is electrically symmetrical?
What do you mean by NTP (normal temperature and pressure) and STP (standard temperature and pressure)?
Can u explain me Liquefaction of Gases?
the weight of 1 mole of agas of density 0.1784g/L at NTP is ___?
To identify the contents of an unlabelled cylinder of gas,a sample was collected and found to have a density of 5.380g/L at 15 degreesC and 736mm Hg pressure.what is the molar mass of the gas?
why do gases show deviation from ideal behaviour?
a 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?
how to make a project on adulteration of food in chemistry ... what should be the contents of it?
Why are vegetables cooked with difficulty at a hill station?
The pressure exerted by a gas in sealed container is 100kPa at 17oC. It was found that the container might leak if the internal pressure exceeds 120kPa. Assuming constant volume, at what temperature in oC will the container start to leak?
A quantity of an ideal gas is collected in a graduated tube over the mercury. The volume of gas at 20.C is 50 ml and the level of the mercury is 100mm above the outside of the mercury level. The atmospheric pressure is 750mm. Volume of gas at STP is? (Take R = 0.083 litre atm/mole )
The ballon has maximum capacity of 20L .At 1 atm 10L of air is filled in the ballon .It will burst when pressure is _(assuming isothermal condition )
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 ?
why does CO2 show large deviation than H2,N2 etc from ideal gas?
what is the unit of the constants in van der waal's equation?
plzzzzzzzzz answer as soon as possible
E.g: 9876543210, 01112345678
We will give you a call shortly, Thank You
Office hours: 9:00 am to 9:00 pm IST (7 days a week)
Syllabus
explain the physical significance of van der waals parameter?
on what factors does the surface tension depends?
why gases do not settle down at the bottom of the container when kept in it?
Why 2nd Electron Gain Enthalpy of oxygen is positive?
a) H2, 2.5 s
b) SO2, 16 s
c) CO, 10 s
d) He, 4 s
b) If the absolute temperature at the surface is 4 times that at the bottom , then find radius of bobble at the surface.
by sucking through a straw a student can reduce the pressure in his lungs to 750mm of mercury density=13.6gm/cm3 using the straw he can drink water from a glass upto a maximum depth of
a) 10cm b) 75cm 3) 13.6cm 4)1.36cm
Strongest Base --
Be(OH)2 , Mg(OH)2 , Al(OH)3 , Si(OH)4
Why?
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?
DIFFERENCE BETWEEN REAL GAS AND IDEAL GAS (IN POINTS)
What will be the graph between log p and inverse of log v ?
nitric acid avery important industrial chemical.,is made by dissolving the gas NOx,in water. calculate the formula of gas,if at 1.24 atm and 50C density of gas is 2.15g/L.
Relationship between different types of speeds:cmp:cav:crms::1:1.128:1.224cav= 0.9213crmscrms= 1.086cavcmp= 0.816crms
explain how?prove that PV=1/3 mNc2
in the space between two stars, the temperature of a gas cloud is 12K and the density of hte gas is 1.2 x10-17 atom/m3. the absolute pressure of the gas is ?????
the volume of a gas at 0 degree C and 700mm Pressure is 760 cc. the no. of molecules present in this volume is___?
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
1) 0.1 m Urea
2) 0.1 m Glucose
3) 0.1 m Sucrose
4) equal in all cases
Why rain drops are spherical ?
how do we do hybridisation for hcooh
explain why o-hydroxy benzaldehyde is liquid at room temp. while p-hydroxy benzaldehyde is a high melting solid?
1) 0.1 m urea
2) 0.2 m urea
3) 0.1 m NaCl
4) 0.2 m
DIFFERENCE BETWEEN VAPOUR PRESSURE 7 SURFACE TENSION
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
Out of CO2 and NH3, which gas is expected to show more deviation from ideal behaviour?
Help :o
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.
(Q.)
Calculate the pressure of 1x10 to the power 22 molecules of oxygen gas when enclosed in a vessel of 5L capacity at temp of 27 degree Celcius.
(Ans=0.817 atm)
Help please!
what is STP and NTP???
reply soon :)
a certain gas takes 3 times as long to effuse out as helium.what will be its molecular mass?
and expands to a radius of 3.0 m when it has risen to its maximum altitude, where the
temperature is -20 ◦C. What is the pressure inside the balloon at that altitude ?
what should be the percentage increase in pressure for 5% decrease in volume?
a) N2(g)
b) CH4(g)
c) NH3(g)
d) H2(g)
when salt or sugar are poured into different kinds of vessels why do they take the shape of the vessel?
Kindly answer sir/mam.
a) +1
b) -1
c) 1/T
d) 1/n
i. Which type of intermolecular forces exist between NaCl and H2O
ii. What will be the pressure of the gaseous mixture when 0.5 L of H2 at 0.8 bar and 2.0 L of O2 at 0.7 bar are introduced in a 1 L vessel at 27C?
A mixture of hydrogen and oxygen at 1 bar pressure contains 20% by mass of Hydrogen .Calculate the partial pressure of hydrogen .
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?
what is electrically symmetrical?
What do you mean by NTP (normal temperature and pressure) and STP (standard temperature and pressure)?
Can u explain me Liquefaction of Gases?
the weight of 1 mole of agas of density 0.1784g/L at NTP is ___?
To identify the contents of an unlabelled cylinder of gas,a sample was collected and found to have a density of 5.380g/L at 15 degreesC and 736mm Hg pressure.what is the molar mass of the gas?
why do gases show deviation from ideal behaviour?
a 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?
how to make a project on adulteration of food in chemistry ... what should be the contents of it?
7.Calculate the perimeter of given plane in HCP unit cell (Given that radius of atoms = R Å).
Why are vegetables cooked with difficulty at a hill station?
The pressure exerted by a gas in sealed container is 100kPa at 17oC. It was found that the container might leak if the internal pressure exceeds 120kPa. Assuming constant volume, at what temperature in oC will the container start to leak?
A quantity of an ideal gas is collected in a graduated tube over the mercury. The volume of gas at 20.C is 50 ml and the level of the mercury is 100mm above the outside of the mercury level. The atmospheric pressure is 750mm. Volume of gas at STP is? (Take R = 0.083 litre atm/mole )
The ballon has maximum capacity of 20L .At 1 atm 10L of air is filled in the ballon .It will burst when pressure is _(assuming isothermal condition )
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 ?
why does CO2 show large deviation than H2,N2 etc from ideal gas?
what is the unit of the constants in van der waal's equation?
plzzzzzzzzz answer as soon as possible
1)64
2) 80 3) 332