List of top Chemistry Questions

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)
Out of the following, which type of interaction is responsible for the stabilisation of α-helix structure of proteins ?
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.
The gas released during anaerobic degradation of vegetation may lead to :
Which of the following reagent is used for the following reaction ? $CH_3CH_2CH_3 \to CH_3CH_2CHO$
Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionization enthalpy is :
The major components in “Gun Metal” are :
Which of the following ore is concentrated using group 1 cyanide salt ?

Using the provided information in paper chromatography

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

Compound(s) which will liberate carbon dioxide with sodium bicarbonate ($NaHCO_3$) solution is/are : A = Urea, B = Benzoic acid, C = p-Nitrophenol

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 : 

In basic medium CrO$_4^{2-}$ oxidises S$_2$O$_3^{2-}$ to form SO$_4^{2-}$ and itself changes into Cr(OH)$_4^-$. The volume of 0.154 M CrO$_4^{2-}$ required to react with 40 mL of 0.25 M S$_2$O$_3^{2-}$ is _________ mL.
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$_6$
Which of the glycosidic linkage between galactose and glucose is present in lactose ?
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 ___________
Which statement is correct ?
0.4 g mixture of NaOH, Na$_2$CO$_3$ and some inert impurities was first titrated with N/10 HCl using phenolphthalein as an indicator, 17.5 mL of HCl was required at the end point. After this methyl orange was added and titrated. 1.5 mL of same HCl was required for the next end point. The weight percentage of Na$_2$CO$_3$ in the mixture is _________
The major product of the following chemical reaction is : R-CN $\xrightarrow{(1) H_3O^+, \Delta (2) SOCl_2 (3) Pd/BaSO_4, H_2}$ ? (Using $R$ as the alkyl group from the prompt skeleton)
Given below are two statements : Statement I : An allotrope of oxygen is an important intermediate in the formation of reducing smog. Statement II : Gases such as oxides of nitrogen and sulphur present in troposphere contribute to the formation of photochemical smog. In the light of the above statements, choose the correct answer from the options given below :
Complete combustion of 1.80 g of an oxygen containing compound (C$_x$H$_y$O$_z$) gave 2.64 g of CO$_2$ and 1.08 g of H$_2$O. The percentage of oxygen in the organic compound is :
In Freundlich adsorption isotherm at moderate pressure, the extent of adsorption $(x/m)$ is directly proportional to $P^x$. The value of x is :
The correct statement about B$_2$H$_6$ is :
Ellingham diagram is a graphical representation of :