Recently Active Chemistry Questions

In a material science laboratory certain salts were melted in order to find the ideal decorative crystal for interstellar travel. Salt A melted at 399 degrees, Salt B melted at 814 Salt C melted at 414 And salt D melted ...

You are given four boxes; containing four different types of substances. It is seen that the substance in the first one conducts electricity in its aqueous solution, the second conducts it in its native form/solid and the thi ...

The greatest bond angle is found in ...

The hydrogen bond is strongest in ...

The compound which contains both ionic and covalent bonds is ...

How many s and p-bonds are there in the molecule of tetracyanoethylene, *Image* ...

Which of these salts is least ionic ? ...

Which C-atom is the most electronegative in this structure mathop {C{H_3}}limits^{{ m{III}}}-mathop {C{H_2}}limits^{{ m{II}}}-Cequiv mathop{CH}limits^{ m{I}} ...

Element X is strongly electropositive and element Y is strongly electronegative. Both are univalent. The compound formed would be ...

Arrange the following hydroxides in order of their solubility. Magnesium hydroxide(1),Calcium Hydroxide (2),Barium Hydroxide (3),Strontium Hydroxide (4) ...

The water vapour pressure at 293 K is 2338 Pa and the vapour pressure of an aqueous solution is 2295.8 Pa. Determine its osmotic pressure at 313 Kif the solution density at this temperature is 1.01 g/cc. The molecular weight ...

what is the freezing pt of a aqueous sol. containing 5 % by mass urea,1% by massof KCl and 10% by mass glucose...(kfH20=1.86) a)290.2 K B)285.5K C)169.93K D)250K ...

In a H-atom the energy in the nth orbit is given as En = -13.6/n2 ev . Show that En+1 - En = -13.6*2/n3 for large n values How to solve?? ...

Half lihe is independent of the concentration of the reaction....After 10mins vol. of N2 gas is 10l and after complete reaction it is 50l ..hence rate const : a)(2.303/10)log 5 /min b)(2.303/10)log 1.25 c)(2.303/10)log 2 d)(2 ...

Somebody please post few topic wise questions of organic chemistry..especially to practice the applications of some reactions that are included in our JEE syllabus.eg.oxymercuration demercuration,or halohydrin formation etc.s ...

this is only for ix - x which of the following salts are soluble: a) Hg2Cl2 b) CaSO4 c) (NH4)2S d)AL2(SO4)3 finding the chemistry section empty... posted the thread.. ...

I didn't understand the s,p,d,f configuration dat was mentioned in d "blue" booklet 4 class IX (Preparatory Course For batch 2010-2011) in d Periodic Table Chapter. Anyone plz xplain me dat! ...

Chlorine molecules are 1.0% dissociated at 975 K at a pressure of 1.0 atm(1.0% of the pressure is due to Cl atoms). Cl2→2Cl Calculate Kp and Kc. ...

A sample of 20g of a compound (m.w=120)which is a non electrolyte is dissolved in 10g of ethanol.if the vapour press of the ethanol at the temp. used is 0.250 atm what is the vapour pressure os the ethanol above the sol. ? a) ...

In a reaction NH4NO2 → N2(g) + 2H2O (l) the volume of N2 after 20 mins and after a long time is 40ml and 70ml respectively ...the value of rate const is: a)(1/20)ln(7/4) /min b)(2.303/1200)log(7/3) /sec c)(1/20)log(7/3) /mi ...

given that for a reaction of first order n,the integrated form of the rate equation is : k=(1/t(n-1))[1/(Cn-1) - 1/(C0n-1)] where c0 and c are the values of the reactant concentration at the start of time t ...what is the rel ...

find the product ...

In a reaction NH4NO2 → N2(g) + 2H2O (l) the volume of N2 after 20 mins and after a long time is 40ml and 70ml respectively ...the value of rate const is: a)(1/20)ln(7/4) /min b)(2.303/1200)log(7/3) /sec c)(1/20)log(7/3) /mi ...

A weak base BOH of concentration 0.02 mole/litre has a pH value of 10.45.If 100 ml of the base is mixed with 10 ml of 0.1 M HCl, what will be the pH of the mixture? ...

The pH of a 102 M HCl solution at 250C would be: a. -2 b. 2 c. 0 d. between 0 & 1 Please provide your logic for the answer as well ...

A weak base BOH of concentration 0.02 mole/litre has a pH value of 10.45.If 100 ml of the base is mixed with 10 ml of 0.1 M HCl, what will be the pH of the mixture? ...

The number of waves made by an electron moving in an orbit having maximum quantum number(m)+3 is (a)3 (b)4 (c)5 (d)6 ...

The first ionization energy of H is 21.79x10-19J.Calculate the second ionization energy of He atom. (According to me, 2nd I.E of He=E2-E∞ =(21.79x10-19)x 22/22 -0 (E=21.79x10-19x z2/n2 ) =21.79x10-19J given correct answer i ...

Hey friends please tell me how JD Lee Concise Inorganic chemistry should be used for JEE preparation , I am asking this because this a very big book and require a lot of time , should I do the whole JEE Inorganic chemistry sy ...

How much ice will separate if a solution containing 25 g ethylene glycol C[2]H[4]OH[2] in 100 g water is cooled by 10 K?(molal depression constant=1.86 for water). ...