The three important states of matter are
solid,liquid and gas are the three states of matter.
In the kinetic molecular theory attraction between molecules of the gas is
KTG assume no intermolecular forces is exerting between the gas molecules.
The drain cleaner, Drainex contains small bits of aluminum which react with caustic soda to produce dihydrogen. What volume of dihydrogen at 20 ∘C and one bar will be released when 0.15g of aluminum reacts?
Moles of Al= 0.15/27 =0.0055 moles And 2 mole of Al produces 3 moles of H2 so 0.0055 moles will produce 3/2x0.0055 moles of H2 =0.00825 moles. Now PV=nRT where n=0.00825 , P=1 bar and T=293K.
A person living in Shimla observed that cooking food without using pressure cooker takes more time. The reason for this observation is that at high altitude:
As we move to higher altitude P decreases.
Which of the following figures does not represent 1 mole of dioxygen gas at STP?
1 mole of O2 at STP has mass 32g and volume 22.7L
Physical behavior of the states differs greatly even though chemical behavior of the three states is identical because
chemical properties depend on intramolecular bonding forces whereas physical properties depend on intermolecular nonbonding forces
Real gases show deviations from ideal gas law because
Real gases have intermolecular forces of interaction.
What will be the pressure exerted by a mixture of 3.2 g of methane and 4.4 g of carbon dioxide contained in a 9 dm3 flask at 27∘C ?
P=P1+P2 (Acc. To Daltons Law) And P1×9=0.2xRT And P2×9=0.1xRT where T= 300K
Which of the following property of water can be used to explain the spherical shape of rain droplets?
surface Tension is used.
under which of the following two conditions, a gas deviates most from the ideal behavior?
At High pressure and Low temperature ideal gases deviates.
dipole-dipole forces act between molecules that have
dipole dipole forces act between molecules that have a permanent electrical dipole moment
Which is the correct form of van der Waals equation?
is vanderwall gas equation of real gases.
What will be the pressure of the gaseous mixture when 0.5 L of H2 at 0.8 bar and 2.0 L of dioxygen at 0.7 bar are introduced in a 1L vessel at27∘C ?
PH2x1=0.8x0.5 PO2 x 1=0.7x2 And P=PH2+PO2
A plot of volume (V ) versus temperature (T ) for a gas at constant pressure is a straight line passing through the origin. The plots at different values of pressure are shown in Figure. Which of the following order of pressure is correct for this gas?
keep Temperature constant we know Pα1/V So as V increases P decreases.
Which of the following changes decrease the vapour pressure of water kept in a sealed vessel?
Adding a non volatile solute like salt decreases the vapor pressure of water
Which of the following statements about Hydrogen bond incorrect?
In hydrogen bonding H atom becomes partially negative and is attracted to the more positive N atom.RETAKEMORE
behaviour of the gas becomes more ideal when
At low P and High T condition Real gases behave as ideal.
Density of a gas is found to be 5.46 g/dm3g/dm3 at 27 ∘C∘C at 2 bar pressure. What will be its density at STP?
The interaction energy of London force is inversely proportional to sixth power of the distance between two interacting particles but their magnitude depends upon
Its magnitude depends on the polarisability of interacting particles.
Heat of vaporization is always larger than the Heat of fusion because
Because it takes more energy to separate particles completely than just to free them from their fixed positions in the solid
The intermolecular force primarily responsible for the condensed states of nonpolar substances is the
The intermolecular force primarily responsible for the condensed states of nonpolar substances is the dispersion force (or London force).
Critical temperature (TC)of carbon dioxide is the highest temperature at which liquid carbon dioxide is observed. Above this temperature
Tc is the highest Temp where a gas can exist in liquid state. Above this no liquid state exist.
34.05 mL of phosphorus vapour weighs 0.0625 g at 546∘C and 0.1 bar pressure. What is the molar mass of phosphorus?
PV=(0.0625/M)RT where p=0.1bar T=819.15K and V= 34.05ml
Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess ‘partial charges’. The partial charge is
It is less than unit electronic charge.
The fraction of molecules with enough energy to escape the liquid
The fraction of molecules with enough energy to escape the liquid is greater at the higher temperature