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Mole fraction of the component A in vapour phase is x1 and mole fraction of component A in liquid mixture is x2

pA=p∘Aχ2, vapour pressure of A. Mole fraction of A in vapour = pA/ptotal χ1 = p∘Aχ2/p ptotal = p∘Aχ2/χ1... View Article

An organic compound gave the following results C=53.3%,H=15.6,N=31.1%, mol. wt =45. What is molecular formula of the compound?

Element % No. of Moles Simple Ratio C=53.3 53.3/12=4.44 4.44/2.22=2 H=15.6 15.6/1=15.6 15.6/2.22=7 N=31.1 31.1/14=2.22 2.22/2.22=1... View Article

carbon monoxide gas is dissolved in water at 25⁰c and 0.01 atm . henry’s law constant is 5.8 × 10⁴ atm . the mole fraction of co is

The mole fraction of a gas in solution is related to partial pressure of the gas above the solution by Henry's law. ρCO = χCOKH... View Article

The bond length (pm) of F2, H2, Cl2 and I2, respectively is

The bond length is proportional to the atomic size, and vice versa.The atomic size of hydrogen is the smallest. As a result, HH has the shortest... View Article

if 1 mol ideal gas expanded from 5 l to 50 l at 27°c then entropy change involved in the process will be

ΔS = 2.303 nR log(V2/V1)ΔS = 2.303 x 1 x 8.314 log(50/5) ΔS = 2.303 x 1 x 8.314 log(10) ΔS = 2.303 x 1 x 8.314 x... View Article

if enthalpy of combustion of c(s), h2(g) and ch4(g) are –x, – y and –z kj mol–1 then enthalpy of formation of ch4(g) is

ΔH1 = −890kJ/molΔH2 = −393.5kJ/molΔH3 = 2×(−285.8)kJ/molC + 2H2 ⟶ CH4ΔHf =... View Article

ph of an aqueous solution of 0.1 m nh4cl solution is (given pkb (nh4oh) = 4.7)

Given concentration of NH4Cl = 0.1M pKb = 4.7 Formula = pH = -1/2 log Kw - 1/2 log C + 1/2 log Kb pH = -1/2 log 10^(-14) - 1/2 log 0.1 + 1/2 log... View Article

borax bead test is used to identify the nature of cation present in solution by observing the colour of bead. the colour and bead of copper formed during its borax bead test in hot oxidising flame is

Boric anhydride is a non-flammable substance. When it reacts with a coloured metallic salt, it produces a distinctive coloured metal metaborate... View Article

0.1 mol of ideal gas compressed reversibly isothermally from 10 l to 1 l at 100 k. the work done in the process is

It is a reversible & isothermal process. n = 0.1 molP1 = 1P2 = 10T = 100 Work done = -nRT ln (P1/P2)= -(0.1) x 8.314 x 100 x ln(1/10)= +... View Article

the correct order of bond lengths for c–c bonds in benzene, ethyne, ethene and ethane is

One sigma and one pi bond are found in alkene bonds. One sigma and one pi bond are also found in benzene. In the case of benzene, however, the pi... View Article

one mole of hydrogen gas at temperature t is mixed with one mole of helium gas at temperature 2t in an isolated vessel. the equilibrium temperature of the gas mixture is

△Q = nCp△T (Cp)m = [1 x (5R/2) + (1x7R/2)]/2 = 12R/4 = 3R △Q = 2 x 3R x (100-0) △Q = 2 x 3 x 2 x 100 △Q = 1200cal... View Article

a gaseous mixture of equal mass of ch4 and o2 is stored over water. if total pressure is 0.5 atm then partial pressure of dry ch4 gas is (aqueous tension = 0.2 atm)

Molecular Mass of CH4=16 Moles of CH4 = x/16 Molecular Mass of O2=32 Moles of O2 = x/32 Total moles = (x/16) + (x/32) = 3x/32 Mole fractions of... View Article

the correct set of carbonate ores is (i) dolomite (ii) anglesite (iii) cuprite (iv) malachite (v) argentite (vi) siderite

Magnesite − MgCO3 Siderite − FeCO3 are the correct set of carbonate ore.... View Article

100 ml of 0.2 m alcl3 is required just to cause coagulation of 700 ml of as2s3 sol. what is the flocculation value of alcl3?

Flocculation, also known as coagulation is the process of precipitation of a colloidal solution by the addition of the excess of an electrolyte.... View Article

Archives

Mole fraction of the component A in vapour phase is x1 and mole fraction of component A in liquid mixture is x2

An organic compound gave the following results C=53.3%,H=15.6,N=31.1%, mol. wt =45. What is molecular formula of the compound?

carbon monoxide gas is dissolved in water at 25⁰c and 0.01 atm . henry’s law constant is 5.8 × 10⁴ atm . the mole fraction of co is

The bond length (pm) of F2, H2, Cl2 and I2, respectively is

if 1 mol ideal gas expanded from 5 l to 50 l at 27°c then entropy change involved in the process will be

if enthalpy of combustion of c(s), h2(g) and ch4(g) are –x, – y and –z kj mol–1 then enthalpy of formation of ch4(g) is

ph of an aqueous solution of 0.1 m nh4cl solution is (given pkb (nh4oh) = 4.7)

borax bead test is used to identify the nature of cation present in solution by observing the colour of bead. the colour and bead of copper formed during its borax bead test in hot oxidising flame is

0.1 mol of ideal gas compressed reversibly isothermally from 10 l to 1 l at 100 k. the work done in the process is

the correct order of bond lengths for c–c bonds in benzene, ethyne, ethene and ethane is

one mole of hydrogen gas at temperature t is mixed with one mole of helium gas at temperature 2t in an isolated vessel. the equilibrium temperature of the gas mixture is

a gaseous mixture of equal mass of ch4 and o2 is stored over water. if total pressure is 0.5 atm then partial pressure of dry ch4 gas is (aqueous tension = 0.2 atm)

which among the following pairs has bleaching action due to theIRR reducing and oxidising property respectively?

number of isomeric alcohol(s) with molecular formula c5h12o which will give positive iodoform test is

time+required+for+75%+radioactive+disintegration

at equilibrium the rate of dissolution of a solid solute in a volatile liquid solvent is

if 2.8 g of a metal oxide contains 0.8 g oxygen, then the equivalent mass of the metal is

solubility of cu(oh)2 in 0.1 m aqueous naoh solution is (ksp of cu(oh)2 = 2.2 × 10–20)

the correct set of carbonate ores is (i) dolomite (ii) anglesite (iii) cuprite (iv) malachite (v) argentite (vi) siderite

100 ml of 0.2 m alcl3 is required just to cause coagulation of 700 ml of as2s3 sol. what is the flocculation value of alcl3?

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