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reema took 5 ml of lead nitrate solution in a beaker and added approximately 4 ml of potassium iodide solution to it. what would she observe?

The relation between lead nitrate and potassium iodide is an example of precipitation reaction. Pb(No3)2 + 2KI ⟶ PbI2 + 2KNO3 (yellow ppt) The... View Article

a radioactive substance has activity 2a0 at t = 0. after 3 second it has activity a0. the decay constant of the sample is

t=0 activity is N0 then after time t the activity is given as 100=1600×(1/2)^n so n=4 n=4 and t=8s we get t1/2 = 2s So activity after 2 seconds... View Article

one mole of n2o4 in a 1l flask decomposes to attain the equilibrium n2o4(g) ⇌ 2no2(g). at the equilibrium the mole fraction of n2o4 is 1 2 . then kc will be

Mole fraction of NO2=2x/(1−x+2x)=2x/(x+1)=1/2 solving, we get 4x=x+1 3x=1 x=1/3 =(4/9)/(2/3)=4X3/9X2=2/3 Therefore, 2/3 is the answer.... View Article

1 mol of ideal gas expands reversibly and isothermally from 1 l to 100 l at 300 k. the heat exchange during the process is nearly

W = −1×8.314×300×ln 20/10 W = −2494.2×(ln2−ln1) = −1728.8J = −1.73 kJ From first law of... View Article

the gold number of four protective colloids a, b, c and d are 0.1, 0.25, 5 and 15 respectively. the maximum protecting power is of

Smaller the gold number, greater is the protective power. 0.25>0.1>5>15... View Article

a gas mixture consists of 2 moles of nitrogen and 4 moles of xenon at temperature t. neglecting all vibrational modes, the total internal energy of the system is

For Oxygen , no of moles n1=2 , no. Of degree of freedom per molecule, f1=5 For Argon, no.of moles , n2=4 no.of degree of freedom per... View Article

consider the ellingham diagram for zn, mg and carbon converting into theIRR corresponding oxides. at 1100ºc, which one of the following reactions is spontaneous to a maximum extent?

Any metal will reduce the oxide of other metals above it on the Ellingham diagram because the free energy difference will become more negative,... View Article

amount of heat evolved when 500 cm3 of 0.2 m h2so4 is mixed with 200 cm3 of 0.5 m naoh solution is

In neutralisation of 1 mole of NaOH by 1 mole HCl, heat evolved =57.3kJ To neutralise 0.04 mole of NaOH by 0.04 mole of HCl, Heat evolved will... View Article

reaction follows following rate law rate = . starting with initial conc. of one mole of a and b each, what is the time taken (in sec) for amount of a to become 0.25 mole. given ,

If the sum of all powers elevated to the concentration is zero, a reaction is said to be zero order, and if the sum of all powers raised to the... View Article

the kinetic energy of an electron in an orbit of radius r in hydrogen atom is (e is electronic charge,

The kinetic energy, which arises from electron motion, is K = ½mv2. The total energy of the electron is the sum of the kinetic and potential energies.... View Article

the relative lowering of vapour pressure of a solution containing 0.1 mol of nacl in 18 g of water is

According to Raoult's law, the mole fraction of non-volatile solute in a solution equals the relative decrease in vapour pressure. It is a... View Article

molality of an aqueous solution of urea in which mole fraction of urea is 0.18, is

0.1 mole fraction of urea = 0.1/(0.1+0.9) 0.1 mole urea 0.9 water Mass of H2O = 0.9 x 18 m = 0.1/[0.9 x 18 x 10^(-3)] = 10^(3) x 0.00617 = 6.17... View Article

consider the reaction n1a → n2b. the variation of concentration of (a) and that of (b) with time is as shown. what is the concentration of (b) at the point of intersection?

A→B Concentration of reactarts and products varies exponentialy w.r.f time (i) Concentration of reactant (here, A) decreases exponentially w.r.t... View Article

0.25 g lyophillic colloid is added to 100 ml gold solution to prevent the coagulation on adding 1 ml 10% NaCl Solution . What will be gold number of tyophilic colloid?

Gold number = Minimum amount of protective colloid (mg)0.25g = 100ml of gold solution1ml of gold solution = (250/100)x110ml of gold solution =... View Article

Archives

reema took 5 ml of lead nitrate solution in a beaker and added approximately 4 ml of potassium iodide solution to it. what would she observe?

a radioactive substance has activity 2a0 at t = 0. after 3 second it has activity a0. the decay constant of the sample is

one mole of n2o4 in a 1l flask decomposes to attain the equilibrium n2o4(g) ⇌ 2no2(g). at the equilibrium the mole fraction of n2o4 is 1 2 . then kc will be

1 mol of ideal gas expands reversibly and isothermally from 1 l to 100 l at 300 k. the heat exchange during the process is nearly

the gold number of four protective colloids a, b, c and d are 0.1, 0.25, 5 and 15 respectively. the maximum protecting power is of

a gas mixture consists of 2 moles of nitrogen and 4 moles of xenon at temperature t. neglecting all vibrational modes, the total internal energy of the system is

consider the ellingham diagram for zn, mg and carbon converting into theIRR corresponding oxides. at 1100ºc, which one of the following reactions is spontaneous to a maximum extent?

amount of heat evolved when 500 cm3 of 0.2 m h2so4 is mixed with 200 cm3 of 0.5 m naoh solution is

reaction follows following rate law rate = . starting with initial conc. of one mole of a and b each, what is the time taken (in sec) for amount of a to become 0.25 mole. given ,

the kinetic energy of an electron in an orbit of radius r in hydrogen atom is (e is electronic charge,

the relative lowering of vapour pressure of a solution containing 0.1 mol of nacl in 18 g of water is

molality of an aqueous solution of urea in which mole fraction of urea is 0.18, is

consider the reaction n1a → n2b. the variation of concentration of (a) and that of (b) with time is as shown. what is the concentration of (b) at the point of intersection?

0.25 g lyophillic colloid is added to 100 ml gold solution to prevent the coagulation on adding 1 ml 10% NaCl Solution . What will be gold number of tyophilic colloid?

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