List of top Chemistry Questions

Artificial sweetener which is stable under cold conditions only is:

The reaction of aqueous KMnO₄ with H₂O₂ in acidic conditions gives:

In acidic medium, H₂O₂ changes Cr₂O₇^2- to CrO₅ which has two (-O-O-) bonds. Oxidation state of Cr in CrO₅ is

Which of the following orders of ionic radii is correctly represented?

Which of the following salts will give highest pH in water ?

Which of the following organic compoundspolymerizes to form the polyester Dacron?

Which of the following compounds will undergo racemisation when solution of KOH hydrolysis?

Which one of the following is not a commoncomponent of Photochemical Smog?

Which of the following will be most stable diazoniumsalt RN²⁺X^- ?

For $Cr_2O_7^{-2} + 14H^{+} + 6e^{-} \to 2Cr^{+3} + 7H_2O; E $$^\circ$= $1.33 V At [Cr_2O_7 ^{-2}] = 4.5$ milli mole $[Cr^{+3}]=15$ milli mole, $E$ is $1.067\, V$.The pH of the solution is nearly equal to

The number of double bonds in gammexane is :

Which of the following ions can be separated by a $NH_4OH$ in presence of $NH_4Cl$

One mole of $PCl_5$ is heated in a closed 2 $dm^3$ vessel. At equilibrium 40% $PCl_5$ is dissociated. Calculate the equilibrium constant.

The correct order of oxidising power is : $VO_2^+$ $< Cr_2O_7^{2-} < MnO_4^-$ The oxidation state of $Mn$ is $+7$.

In the presence of peroxide, $HCl$ and $HI$ do not give anti-Markownikoff' s addition to alkenes because :

Conversion of benzene diazonium chloride to chloro benzene is an example of which of the following reactions ?

Amongst $LiCl, RbCl, BeCl_2$ and $MgCl_2$ the compounds with the greatest and the least ionic character, respectively are :

Which one of the following molecules is paramagnetic ?

In S$_N$2 reactions, the correct order of reactivity for the following compounds $CH_3Cl,CH_3CH_2Cl, (CH_3 )_2CHCl$ and (CH$_3 )_3CCl$ is

Which one of the following substituents at para-position is most effective in stabilizing the phenoxide ion ?

Which one of the following compounds will not be soluble in sodium bicarbonate?

Chloro compound of Vanadium has only spin magnetic moment of $1.73\, BM$. This Vanadium chloride has the formula : (at. no. of $V = 23$)

Assuming that the degree of hydrolysis is small, the pH of 0.1 M solution of sodium acetate $(K_a = 1.0 \times 10^{-5})$ will be :

At a certain temperature, only $50\%$ $HI$ is dissociated into $H_2$ and $I_2$ at equilibrium. The equilibrium constant is :

The amount of $BaSO _{4}$ formed upon mixing $100 \,mL$ of $20.8 \% BaCl _{2}$ solution with $50 \,mL$ of $9.8 \% H _{2} SO _{4}$ solution will be : $( Ba =137, Cl =35.5, S =32, H =1$ and $O =16)$