List of top Chemistry Questions

Which one of the following ions has electronic configuration $[Ar] 3d^6 ? $ (At.no. $Mn =25, Fe = 26,Co =27, Ni = 28)$
Which one of the following molecular hydrides acts as a Lewis acid?
Which of the following conformers for ethylene glycol is most stable ?
van der Waals equation of state is obeyed by real gases. For $ n $ moles of a real gas, the expression will be
Insulin, a hormone, chemically is
Given are cyclohexanol (I), acetic acid (II), 2, 4, 6-trinitrophenol (III) and phenol (IV). In these, the order of decreasing acidic character will be
Electron affinity is maximum for
Drying oil invariably contains
Which of the following configurations represents the metallic element?
The low solubility of barium sulphate in water is due to
A pair of compounds which shows geometrical isomerism are
Which of the following is not an ore of magnesium?
Which one of the following types of drugs reduces fever?
Producer gas is the mixture of :
Which one of the following types of drugs reduces fever ?
A factory produces $40\, kg$ of calcium in two hours by electrolysis. How much aluminium can be produced by same current in $2 \,hours$ if current efficiency is $50\%$?
$ {A (C10H_18O) ->[{HCL}] P}$
Degree of unsaturation of $A = 2$, it contains no double or triple bonds.
Consider the following bromides :
The correct order of $S_N1$ reactivity is
Which one of the following has an optical isomer ? (en = ethylenediamine)
One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of $44 \,u$. The alkene is
The energy required to break one mole of $Cl-Cl$ bonds in $Cl_2$ is $242\, kJ\, mol^{-1}$. The longest wavelength of light capable of breaking a single $Cl - Cl$ bond is ($c = 3 \times 108 \,ms^{-1}$ and $NA = 6.02 \times 10^{23}\, mol^{-1}$)
If $10^{-4}\, dm^3$ of water is introduced into a $1.0\, dm^3$ flask to $300\, K$, how many moles of water are in the vapour phase when equilibrium is established ? (Given : Vapour pressure of $H_2O$ at $300\, K$ is $3170\, Pa ;\, R = 8.314 \,J \,K^{-1}\, mol^{-1}$)
A solution containing $2.675\, g$ of $CoCl_3. 6\, NH_3$ (molar mass $= 267.5\, g\, mol^{-1}$) is passed through a cation exchanger. The chloride ions obtained in solution were treated with excess of $AgNO_3$ to give $4.78\, g$ of $AgCl$ (molar mass $= 143.5 \,g \,mol^{-1}$). The formula of the complex is (At. Mass of Ag = 108 u)
Chemical formula of phosgene is
At room temperature, the eclipsed and staggered forms of ethane cannot be isolated because