List of top Chemistry Questions

The de-Broglie wavelength ($\lambda$) for electron ($e$), proton ($p$), and He²⁺ ion ($\alpha$) are in the following order, Speed of $e$, $p$, and $\alpha$ are the same
How much solid oxalic acid (molecular weight $126$) has to be weighed to prepare $100$ mL of exactly $0.1$ N oxalic acid solution in water?
The number of unpaired electrons in $Mn^{2+}$ ion is
The correct pair of electron affinity order is:
The number of atoms in body-centred and face-centred cubic unit cell respectively are
XeF2, NO2, HCN, ClO2, CO2 Identify the non-linear molecule-pair from the above mentioned molecules.
A sample of MgCO3 is dissolved in dilute HCl and the solution is neutralized with ammonia and buffered with NH4Cl / NH4OH. Disodium hydrogen phosphate reagent is added to the resulting solution. A white precipitate is formed. What is the formula of the precipitate?
Pick the correct statement:
Oxidation states of Cr in K2Cr2O7 and CrO5 are, respectively:
The above conversion can be carried out by:
The metal-pair that can produce nascent hydrogen in alkaline medium is:
For the following question, enter the correct numerical value upto TWO decimal places. If the numerical value has more than two decimal places, round-off the value to TWO decimal places. (For example: Numeric value 5 will be written as 5.00 and 2.346 will be written as 2.35) The maximum oxidation state of osmium is \rule{2cm{0.15mm} ?}
For the following question, enter the correct numerical value upto TWO decimal places. If the numerical value has more than two decimal places, round-off the value to TWO decimal places. (For example: Numeric value 5 will be written as 5.00 and 2.346 will be written as 2.35) The van’t Hoff factor for 0.1 M Barium nitrate is 2.74. The percentage of dissociation of Barium nitrate is _____
Aniline on heating with ‘X’ in the presence of KOH gives a product with very bad smell. Which of the following is ‘X’?
For the following question, enter the correct numerical value upto TWO decimal places. If the numerical value has more than two decimal places, round-off the value to TWO decimal places. (For example: Numeric value 5 will be written as 5.00 and 2.346 will be written as 2.35)
0.2 g of an organic compound on complete combustion produces 0.44 g of CO2, then the percentage of carbon in it is _____ %.
For the following question, enter the correct numerical value upto TWO decimal places. If the numerical value has more than two decimal places, round-off the value to TWO decimal places. (For example: Numeric value 5 will be written as 5.00 and 2.346 will be written as 2.35) Given the standard potential \( E^0_{\mathrm{Zn^{2+}/Zn}} = -0.76\,\mathrm{V} \), the EMF of the cell \[ \mathrm{Zn / Zn^{2+}_{(1M)} \parallel HCl \, (pH=2) \, | \, H_{2(atm)}} Pt \] is _____ V.
For the following question, enter the correct numerical value upto TWO decimal places. If the numerical value has more than two decimal places, round-off the value to TWO decimal places. (For example: Numeric value 5 will be written as 5.00 and 2.346 will be written as 2.35) 75% of a first order reaction is completed in 32 minutes. 50% of the reaction would have been completed in ______ minutes.
Haemoglobin of the blood forms carboxyhaemoglobin with
Heterolytic fission of an organic covalent bond gives only
Which of the following order is true regarding the acidic nature of phenol?
On ozonolysis 2-methyl-2-butene gives
$sp^3d^2$ hybridisation is present in
Huckel's rule of aromaticity is
Ellingham diagram represents
Which of the following gives apple green colour to the Bunsen flame?