List of top Chemistry Questions

Identify products A and B. $CH_3 - CH(CH_3) - CH_3 \xrightarrow{\text{dil. } KMnO_4, 273 K} A \xrightarrow{CrO_3} B$ 

The product formed in the first step of the reaction of $CH_3 - CH_2 - CH(Br) - CH_2 - CH(Br) - CH_3$ with excess $Mg/Et_2O$ is :

What is the major product formed by HI reaction with

The electrode potential of \( \mathrm{M^{2+}/M} \) of 3d-series elements shows positive value for :
\( \mathrm{Al_2O_3} \) was leached with alkali to get \( X \). The solution of \( X \), on passing the gas \( Y \), forms \( Z \). \( X, Y \) and \( Z \) respectively are :

In Freundlich adsorption isotherm, slope of AB line is : 

Number of amphoteric compounds among the following is _______. (A) BeO (B) BaO (C) $Be(OH)_2$ (D) $Sr(OH)_2$
At 1990 K and 1 atm pressure, there are equal number of $Cl_2$ molecules and $Cl$ atoms in the reaction mixture. The value of $K_p$ for the reaction $Cl_2(g) \rightleftharpoons 2Cl(g)$ under the above conditions is $x \times 10^{-1}$. The value of $x$ is __________. (Rounded off to the nearest integer)
A proton and a $Li^{3+}$ nucleus are accelerated by the same potential. If $\lambda_{Li}$ and $\lambda_p$ denote the de Broglie wavelengths of $Li^{3+}$ and proton respectively, then the value of $\lambda_{Li} / \lambda_p$ is $x \times 10^{-1}$. The value of $x$ is __________. (Rounded off to the nearest integer) [Mass of $Li^{3+}$ = 8.3 mass of proton]
The reaction of sulphur in alkaline medium is given below: $S_8(s) + a OH^-(aq) \to b S^{2-}(aq) + c S_2O_3^{2-}(aq) + d H_2O(l)$ The value of 'a' is __________. (Integer answer)
The coordination number of an atom in a body-centered cubic structure is _________. [Assume that the lattice is made up of atoms.]
Statement I : Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame. Statement II : Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame.
Match List I with List II.
List I: (a) Caprolactum (b) 2-Chloro-1,3-butadiene (c) Isoprene (d) Acrylonitrile.
List II: (i) Natural rubber (ii) Buna-N (iii) Nylon 6 (iv) Neoprene.
4.5 g of compound A (MW = 90) was used to make 250 mL of its aqueous solution. The molarity of the solution in M is $x \times 10^{-1}$. The value of $x$ is __________. (Rounded off to the nearest integer)
The gas released during anaerobic degradation of vegetation may lead to :
Which of the following reagent is used for the following reaction ? $CH_3CH_2CH_3 \to CH_3CH_2CHO$
Which of the following ore is concentrated using group 1 cyanide salt ?
The major components in “Gun Metal” are :
Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionization enthalpy is :

Using the provided information in paper chromatography

The calculated $R_f$ value of A is __________ $\times 10^{-1}$.

Identify A and B in the chemical reaction. p-Nitrotoluene $\xrightarrow{Cl_2, h\nu}$ A $\xrightarrow{NaI, dry acetone}$ B

Identify A in the given chemical reaction. CH$_2$=CH-CH(CH$_3$)-CH$_3$ $\xrightarrow{Mo_2O_3, 773 K, 10-20 atm}$ A (major product)

The plots of radial distribution functions for various orbitals of hydrogen atom against r are given below: The correct plot for 3s orbital is : 

Among the following, the number of halide(s) which is/are inert to hydrolysis is ___________: (A) BF$_3$, (B) SiCl$_4$, (C) PCl$_5$, (D) SF$_6$
A car tyre is filled with nitrogen gas at 35 psi at 27$^\circ$C. It will burst if pressure exceeds 40 psi. The temperature in $^\circ$C at which the car tyre will burst is ___________