List of top Chemistry Questions

What is the packing efficiency of fcc crystal structure?
38.4 g of an unknown substance (molar mass \(= 384\ \text{g mol}^{-1}\)) and 116 g of acetone are used to prepare a solution at 313 K. If vapour pressure of pure acetone (molar mass \(= 58\ \text{g mol}^{-1}\)) is 0.842 atm, what is the vapour pressure of the solution?
Which of the following is used as disinfectant?
The highest peak in the energy profile diagram for mechanism of alkaline hydrolysis of tertiary butyl bromide represents
How many unit cells are present in 100 g of an element with fcc crystal structure having density \(10\ \text{g cm}^{-3}\) and edge length \(100\ \text{pm}\)?
Freundlich’s equation for adsorption of gas on solid is represented as
Number of primary carbon atoms present in 3-Ethyl-2,4-dimethyl heptane is
Which among the following gases is used in treatment of cancer?
Which of the following is a Gattermann reaction?
Which among the following oxides of nitrogen is a brown coloured gas?
The units nanometer and picometer are related as,
In a first order reaction, 87.5% of reactant is converted into product in 15 minutes. The rate constant for the reaction is given by
Which of the following factors affect molarity of solution?
A certain sample of gas has a volume of \(0.2\ \text{L}\) at one atmosphere pressure and \(273.15\ \text{K}\). What is the volume of gas at \(273.15^\circ\text{C}\) at the same pressure?
Which of the following compounds does NOT react with sodium metal?
Which among the following formulae represents the \(\omega\)-amino caproic acid?
Which among the following is NOT a polar molecular solid?
Which among the following is a product of hydrolysis of one mole raffinose?
\(3.42 \times 10^{-2}\ \text{kg}\) sugar (molar mass = 342) is dissolved in water to produce \(234.2\ \text{g}\) of sugar syrup. What is the molality of sugar syrup?
For a reaction \(\Delta H = -30\ \text{kJ}\) and \(\Delta S = -45\ \text{J K}^{-1}\), at what temperature does the reaction change from spontaneous to non-spontaneous?
Which of the following polymers is prepared by using phenol?
Average bond enthalpy of water is \(464.5\ \text{kJ mol}^{-1}\). If the energy required to break the first O–H bond is \(502\ \text{kJ mol}^{-1}\), how much energy per mole is required to break the second O–H bond?
Which among the following alkali metal chlorides crystallises in the form of a hydrate?
Which among the following is a linear polymer?
Compound A on reaction with chlorine in presence of UV light gives B, which when reacted with \(\text{NaNO}_2\) in the solvent N,N-dimethylformamide gives 2-nitrobutane. The compound A is