Frequent Chemistry Questions

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) ...

1) What is Dielectric Constant? 2) How is solubility of a substance measured? 3) What is lattice energy? ...

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 ...

Phosphorous can form PH3 but no PH5 . why??? ...

Electronegativity of C & O in carbon-monoxide suggests it to be polar. But in reality it is not so. Why? ...

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 ...

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) ...

cosider these two reactions, *Image* My question is why in the case of chlorination the major product formed is different than the one formed in the bromination..? ...

the compound H3N:BF3 is isoelectronic with A)B2H6 B)C2H6 C)C5H12 D)C3H6 . PLEASE EXPLAIN. ...

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 ...

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 ...

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 ...

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?? ...

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? ...

How do you obtain ethyl amine from ethyl alcohol? ...

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? ...

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. ...

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 ...

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 ...

How many times does the electrons go round the first Bohr's orbit of hydrogen in one second? ...

Find the volume of CO2 at NTP obtained on heating 10 gm of pure 90 % pure limestone how to proceed? ...

Calculate the uncertainty in the velocity of a wagon of mass 2000 kg,whose position is known to an accuracy of ±10 metre. ...

please give an example of rearrange reaction. ...

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). ...

A body weighing 3x103kg is moving and its speed can be measured with an accuracy of ±0.0025 mile per hour and its position with an accuracy of ±0.01 mile.Is the uncertainty principle valid? ...

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 ...

A transition of H-atom spectrum has wavelength 1032Ao.Find the transition.(n1 and n2) ...