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If in a solvent, n simple molecules of solute combine of form an associated molecule, alpha is the degree of association, then Van't Hoff factor is equal to

If in 3160 years a radioactive substance becomes one fourth of the original amount . Find its half life periods.

If in a certain element contain one electron in sub shell of 5d-orbital, then the element is..

If I.E. of Na, Mg and Si are respectively 496, 737 and 786 kJ "mol"^(-)The I.E. of Al in KJ "mol"^(-) is :-

If I_(2) is dissolved in aqueous KI, the intense yellow species, I_(3)^(-) is formed. The structure of I_(3)^(-) ion is

If (i)C+O_(2)rarrCO_(2), (ii) C+1//2O_(2)rarrCO, "(iii)"CO+1//2O_(2)rarrCO_(2), the heats of reaction are Q, -12,-10 respectively. Then Q=

If 'I' is the intensity of absorbed light and 'C' is the concentration of AB for the photochemical process AB+hvtoAB^(**), the rate of formation of AB^(**) is directly proportional to

If 'I' is the intensity of absorbed light and C is the concentration of AB for the photochemical process , AB + hv to AB^(**) . The rate of formation of AB^(**) is directly proportional to

If hydrolysis of ester is carried out inpresence of an acid , usig water containing redioactive oxygen atom, the product most likely to be radioactive is ,

If hydrogen electrode dipped I 2 solution of pH=3 and pH=6 and salt bridge is connected the e.m.f. of resulting cell is

If HgI_(2) is stoichiometrically dissolved in a KI solution to get K_(2)[HgI_(4)] complex the osmotic pressure is decreased by5x% . What is x ?

If heat of neutralisation is -13.7 k cal and H_f^(@)H_2O=-68 k cal, then enthalpy of OH^- would be:

If heavy water is taken as solvent of normal water while performing cannizzaro reaction, the products of the reaction are

If helium and methane are allowed to difuse out of the container under the similar conditions of temperature and pressure, then the ratio of rate of diffusion of helium to methane is

If heat of hydrogenationof 1,3 - pentadiene and 1,4 - pentadiene are X and Y kcal respectively , heat of hydrogenation of 2,3 - pentadienewill be

If heatof formation of C Cl_4 is 316 kcal mol^-1 the dissociation energy of C-Cl is :

If heat of combustion of methane is -800kJ, then heat of combustion of 4 xx 10^-4kg of methane is ________ .

If He and CH_(4) are allowed to diffuse out of the container under similar conditions of temperature and pressure then the ratio of the rate of diffusion of He to CH_(4) is

If halfe-life of a substance is 5 yrs, then the total amount of substance left after 15 years, when initial amount is 64 grams is

If half lives of a radioactive element, undergoing parallel path alpha-"decay" and alpha-"decay" are 4 years and 12 years respectively, then percentage of element that remains after 12 years will be:

If H_(2)SO_(4) ionises as H_(2)SO_(4) + 2H_(2)O to 2H_(3)O^(+) + SO_(4)^(-2). Then total number of ions produced by 0*1 M of H_(2)SO_(4) will be

If half-life of a certain radioactive nucleus is 1000s. the disintegration constant is

If H_2SO_4 ionises as : H_2SO_4 + 2H_2O to 2H_3O^(+) + SO_4^(2) Then total number of ions produced by 0.3 M H_2SO_4 will be :

If H_2S is passed through an acidified K_2Cr_2O_7solution, the colour of the solution :

If H_(2) molecule is acting as ligand via oxidate addition : [Ir^(I)(CO)ClL_(2)] ("Vaska's complex")+H_(2) to [Ir^(III)(CO)Cl(H_(2))L_(2)],L=PPh_(3) then, choose the correct statement about the H_(2) molecule fate before and after reaction .

If H_2(g)=2H(g), triangleH=104 cal, then heat of atomisation of hydrogen is:

If H_2(g)+Cl_2(g)→2HCl, ^@=-44 kcal 2Na(s)+2HCl(g→)2NaCl(s)+H_2(g), △H =-152 kcalthen, Na(s)+0.5Cl_2(g)→NaCl(s),△H =?

If {:(H_(2)+1//2O_(2)rarrH_(2)O",",,,,DeltaH= -68 kcal),(K+H_(2)OrarrKOH(aq)+1//2H_(2)",",,,,DeltaH= -48 kcal),(KOH+"water"rarrKOH(aq)",",,,,DeltaH= -14 kcal):} Find the heat of formation of KOH. Find the heat of formation of KOH.

If H^++OHrarrH_2O+13.7 kcal then the heat of neutralisation for complete neutralisation of one mole of H_2SO_4 by a base will be:

If H^(+)+OH^(-)rarrH_(2)O+13.7kcal, then the heat of neutralization for complete neutralization of one mole of H_(2)SO_(4) by base will be

If H is considered as the function of P and T, then which of thefollowing relations is/are corret?

If H^(+) ion concentration of a solution is increased by 10 times its pH will be

If group IV the ppt of Zn(OH)_(2) dissolve in excessof NaOHdue to theformation of

If graph log Kto(1)/(T) is plotted ,a straight line is obtained then what will be value of slope ?

If glycerene C_(3)H_(5)(OH), and methyl alcohol, CH_(3)OH are sold at the same price per kg, which would be cheaper for preparing an antifreeze solution for the radiator of an automobile ?

If gold number of A, B, C and D are 0.005, 0.05, 0.5 and 5 respectively, then which of the following will have the greatest protective value?

If given are following standard electrodes potential, then find out standard potential of cell. [Zn^(+2)|Zn=-0.763V,Ag^(+)|Ag=+0.799V].

If galvanic cell is formed by standard hydrogen electrode with by E_(Cu^(2+)|Cu)^(Theta)=+0.34Vin standard condition, so what is Cu^(2+)|Cu electrode ?

If formic acid, acetic acid, propanoic acid and benzoic acid is mixed with phosphorus and bromine then how many product are formed

If freezing point of 5% w/w aqueous solution of sucrose has 271 K and pure water has freezing point of 273.15 K then calculate freezing point of 5% w/w aqueous solution of glucose.

If formic acid , acetic acid, propanic acid and benzoic acid is mixed with Phosphorus and Bromine then how many product are formed.

If formaldehyde and potassium hydroxide are heated, then we get

If formaldehyde and KOHare heated then we get

If for the raction at 300 K, 2Mg(g)+O_(2)(g)to2MgO(s), Delta_(r)H=-1202kJ"mol"^(-1) and Delta_(r)S=-217.0JK^(-1)"mol"^(-1) The total entropy change (DeltaS)_(T) and gibbs energy change during the course of reaction (Delta_(r)G) are respectively.

If for two gases of molecular weights M_(A) and M_(B) at temperature T_(A) and T_(B), T_(A)M_(B)=T_(B)M_(A), then which property has the same magnitude for both the gases.

If for the half reactions Cu^(2+)+e^- to Cu^+""E^0=0.15V Cu^(2+)+2e^- to Cu""E^0=0.34V Calculate E^0 of the half cell reaction Cu^+ +e^- to Cu also predict whether Cu^+ undergoes also predict whether Cu^+ undergoes disproportionation or not

If for two gases of molecular weight M_Aand M_B at temperature T_A and T_B,T_AM_B= T_BM_A , then which property has the same magnitude for both the gases :

If for H_(2(g))+1/2S_(2(s))hArrH_(2)S_((g))and H_(2(g))+Br_(2(g))hArr2HBr_((g))The equlibrium constants are K_(1) and K_(2) respectively, the reaction Br_(2(g))+H_(2)S_((g))hArr2HBr_((g))+1/2S_(2(g)) would have equlibrium constnt

If H_(2)(g)=2H(g),DeltaH=104cal , then heat of atomisation of hydrogen is

If 'I' is the intensity of absorbed light and 'C' is the concentration of AB for the photochemical process AB+hvtoAB^(), the rate of formation of AB^() is directly proportional to

If 'I' is the intensity of absorbed light and C is the concentration of AB for the photochemical process , AB + hv to AB^() . The rate of formation of AB^() is directly proportional to