Recently Active Physical Chemistry Questions

why does K capture happen in some nuclides only?? i mean if at all it happens in some then it shud happen in most of the cases , a nucleus shud capture one s electron!!! what is the criteria that decides that K capture takes ...

well one after a LONG LONG time...first time ever in chemistry!! grossly conceptual though!! may be easy!! A DIAMOND MOLECULE IS LARGER IN SIZE THAN A CARBON ATOM...SAME FOR MANY...WELL LETS LOOK IN THE CASE OF HYDROGEN...HYD ...

Q1 in a 100ml of an aqueous hydrochloric acid of ph 1.0 , 900 ml of more distilled water is added , the ph of the resultant soln will become_______ answer: 2.0 Q2 50 litres of 0.1M HCL is thouroughly mixed wid 50 litres of 0. ...

what is the difference between atomic weight and gram atomic weight of any element??? ...

Hi, I have the following subjective doubts from atomic structure.... 1. What electronic transition in the He^{+} ion would emit the radiation of the same wavelength as that of the first Lyman transition of hydrogen (ie, for a ...

According to avogadro hypothesis: 1 mole of any gas at NTP/STP occupies a volume equal to =22.4L but according to gas theory a gas takes up the volume of any container in which it is kept ....then what is the use of avogadro' ...

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atoms may be regarded as comprising of p's,n's and e's.if the mass attributed by electrons was doubled and that by neutrons was halved d at mass of C-12 'll b? a)approx. the same b)doubled c)reduced aprrox. 25% d)approx. halv ...

WHAT mass of 60% HCl (by mass) is required to completely react with 0.2 mol of zinc.The reaction is : Zn +2HCl -> ZnCl2+H2 ...

Mixture X=0.02 moles of [Co(NH3)5SO4]Br and 0.02 moles of [Co(NH3)5Br]SO4 was prepared in 2 L of solution: 1 L of mixture X+excess of AgNO3→Y 1 L of mixture X+excess of BaCl2→Z Number of moles of Y and Z are: a)0.01,0.01 ...

Q1 Because of insufficient ignition, a supposed CaO precipitate from a 1 g sample of limestone weighed 0.4125 g and contained 5.3% of its own weight of CaCO3(ie there is CaCO3 left unignited whose amount is 5.3% of 0.4132) . ...

Q) Henry's Law constant for CO2 is 1.67* 108 Pa at 298K. Calculate the quantity of CO2 in 500mL of soda water when packed under 2.5atm CO2 pressure at 298K. (Is th answer 0.0024g??) ...

Why doesn't 1 mole of water in gaseous state fall while 1mole of water in liquid fall from same height? ...

1.Calculate the vapor pressure of 0.1M aqueous solution of non-electrolytes at 75°C. 2. Calculate the molality and molarity of a solution made by mixing equal volumes of 30% by weight of sulphuric acid(density = 1.2 gm/ml)an ...

Q→ A sample of H-atoms containing all atoms in some excited state is irradiated with light of wavelenth ∂ and atoms get reexcited to furthur higher orbit. on removing the light source , atoms de-excite to ground state wit ...

a sample of C2H2 gas has a pressure of 7.8 kpa. After some time a portion of it reacts to form C6H6 gas . The pressure of mixture of gases is then 3.9 kpa . Assuming constant V and T , find the fraction of C2H2 that has under ...

1) Calculate the molarity and molality of 20% aqueous of ethanol soln by volume (density of the soln=0.960g per cm3) 2) Calculate the volume of 80% H2SO4 (density=1.80g/cc) required to prepare 1L of 20% H2SO4 (density=1.25g/c ...

A glass bulb contains 2.24 L of H2 and 1.12 l of D2 at STP. It is connected to a fully evacuated bulb by a stopcock with a small opening. The stop cock is opend for sometime and then closed. The first bulb now contains .10 g ...

11 moles N2 and 12 moles of H2 mixture reacted in 20 litre vessel at 800K. After equilibrium was reached, 6 moles of H2 was present. 3.58 litre of liquid water is injected in equilibrium mixture and resultant gaseous mixture ...

Q) 2.6g sample of pyrolusite was boiled with 65ml of N oxalic acid and excess of dil. H2SO4. The liquid was then filtered and the residue washed. The filtrate and the washing were mixed and made upto 500ml. 100ml of this soln ...

Van der Waals constants for neon and hydrogen are (a1, b1) and (a2, b2) respectively. The maximum number of moles of Neon which will form a homogeneous mixture with n2 moles of hydrogen at 25°C and constant pressure P is: 1. ...

Q1 what are the reactions involved when phosphoric acid h3po4 is titrated using naoh standard solution? Q2 when h3po4 is titrated using naoh solution, phenopthalien end point and methyl orange end points are observed clearly ...

*Image* please explain the concept clearly Q3.for a reaction ,rate expressions is given as----- RX+OH-=ROH +X- rate=4.7*10-5[RX][OH]+0.24*10-5[RX] wHAT PERCENT OF RX REACT BY SN2 ?WHEN [OH]=0.001M. ...

For the reaction, A⟺B,Kc=([B])/([A]) Kc<1 ⇒([B])/([A])<1⇒[B]<[A].If the concentration of reactants is more then the reaction must proceed in forward direction. But my book is writing that the reverse reaction i ...

1) 4.9g of KClO3, on heating shows a wt loss of 0.384g. What per% of the original KClO3 has decomposed? 2) 1.84g of of a mixture of CaCO3 and MgcO3 was heated to a constant weight. The constant weight of the residue was found ...

1) What is detonating gas? 2)When the mixture of MgCO3 & CaCO3 was heated for a long time, the weight decreased by 50%. Calculate the percentage composition of the mixture. 3)Calculate the weight of V2O5 produced from 2g of V ...

From 200 mg of carbon-dioxide,1021 molecules are removed.The amount of carbon-dioxide left is: a)120 mg b)150 mg c)126.9 mg d)100mg. ...

q.) d activity of a radioactivity isotope falls to 12.5% in 90 days. find decay constant. this ques. is solved in p bahadur.... it has used d eq. - K= 2.303/90 log 100/12.5 but d eq. shud be K= 2.303/90 log 100/87.5 na? since ...

A compound contains 28% N and 72% of a metal by weight.3 atoms of metal combine with 2 atoms of N.Find the atomic weight of metal: a)38 b)30 c)24 d)18 ...

A compound contains atoms of three elements:A, B and C.If the oxidation number of A is +2,B is +5 and C is -2,the possible formula of the compound is: a)A3(BC4)2 b)A3(B4C)2 c)ABC2 d)A2(BC3)2 ...