List of top Chemistry Questions

Which of the following molecule has a Lewis structure that does not obey the octet rule?
Which of the following amines will not undergo carblyamine reaction?

14g of cyclopropane burnt completely in excess oxygen. The number of moles of water formed is:

Which of the following statement is incorrect with regard to interstitial compounds of transition elements?
The rate and the rate constant of a reaction has the same units. The order of the reaction is
An organic compound contains 37.5% C, 12.5% H and the rest oxygen. What is the empirical formula of the compound?
Which one of the following is not an essential amino acid?
Choose the achiral molecule in the following:

In the Carius method of estimation of halogen, 0.4g of an organic compound gave 0.188g of AgBr. What is the percentage of bromine in the organic compound? (The atomic mass of Ag = 108 g mol\(^{-1}\) & Br = 80 g mol\(^{-1}\))

The observed molecular weight of a 1:1 strong electrolyte is 117 g mol\(^{-1}\) as determined by the depression of freezing point method. Its theoretical molecular weight is 60 g mol\(^{-1}\). The percentage dissociation of the electrolyte is:
What is the mass of water formed when 1.6 g of methane gas is completely burnt in excess oxygen?
Enthalpy of combustion of ethylene gas at constant pressure of 1 atm and at 300 K is -1410 kJ mol\(^{-1}\). The enthalpy change for the reaction at constant volume and at the same temperature is about (R = 8.3 J K\(^{-1}\) mol\(^{-1}\)):
Which of the following explains why dimethyl ether has lower boiling point than its isomeric compound, ethanol?
Which of the following aqueous mixture is a buffer solution?
In Dumas method of nitrogen estimation, 0.14 g of an organic compound gave 22.4 mL of nitrogen at STP. The percentage of nitrogen in the compound is:
Which lanthanide element has half-filled 4f orbitals in its +3 state?
Which of the following 3d block element exhibits +2, +3, +4, +5, +6 and +7 oxidation states?
Thermal decomposition of a compound X follows first order kinetics. The initial concentration of X is 2 mol L\(^{-1}\). It decreased to 0.125 mol L\(^{-1}\) in one hour at 400K. What is the half-life period of the reaction at 400K? (log 2 = 0.3010)
The correct electronic configuration of Tc (Z = 43) is:
For which of the following molecules, resonance structures are necessary to describe the bonding satisfactorily?
The alkene that exhibits optical isomerism is:
In which of the following reaction Lindlar's catalyst is used?
Some enzyme catalysed reactions which occur at metal surfaces are:
In which of the following equilibrium, increase in pressure shifts the equilibrium in the forward direction?
The number of angular and radial nodes present in '4d' orbitals are respectively: