List of top Chemistry Questions

For a reaction, given below is the graph of ln k vs 1/T. The activation energy for the reaction is equal to____ \(cal mol^{–1}\). (Nearest integer) 

(Given: \(R = 2 cal K^{-1} mol^{-1}\))

Graph In k vs T

Which of the following has least tendency toliberate $H_2$ from mineral acids?
A sample of 0.125 g of an organic compound when analysed by Duma’s method yields 22.78 mL of nitrogen gas collected over KOH solution at 280 K and 759 mm Hg. The percentage of nitrogen in the given organic compound is____.(Nearest integer) 
Given : 1. The vapour pressure of water of 280 K is 14.2 mm Hg. 
            2. R = 0.082 L atm K–1 mol–1
Which of the following relation is not correct?
Which of the following sets of quantum numbers is not allowed?
Which of the given reactions is not an example of disproportionation reaction?
Which of the reaction is suitable for concentrating ore by leaching process?

Which of the following statement is incorrect?

Which of the following statement is incorrect?

Identify the major products A and B for the below given reaction sequence.
Identify the major products A and B for the below given reaction sequence.

 

The correct order of density is
High purity (>99.95%) dihydrogen is obtained by
A sample of 4.5 mg of an unknown monohydric alcohol, R–OH was added to methylmagnesium iodide. A gas is evolved and is collected and its volume measured to be 3.1 mL. The molecular weight of the unknown alcohol is___ g/mol. [Nearest integer]

For the decomposition of azomethane, CH3N2CH3(g) → CH3CH3(g) + N2(g), a first-order reaction, the variation in partial pressure with time at 600 K is given as
The half-life of the reaction is ______ × 10–5s. [Nearest integer]

In base vs acid titration, at the endpoint methyl orange is present as
The correct structure of C is
structure of C
Arrange the following in decreasing acidic strength.
decreasing acidic strength.
What is the major product of the following reaction?
major product of the following reaction
The disproportionation of MnO42- in acidic medium resulted in the formation of two manganese compounds A and B. If the oxidation state of Mn in B is smaller than that of A, then the spin-only magnetic moment (μ) value of B in BM is _______. (Nearest integer)
On complete combustion of 0.492 g of an organic compound containing C, H and O, 0.7938 g of CO2 and 0.4428 g of H2O was produced. The % composition of oxygen in the compound is _______.
The major product of the following reaction is
major product of the following reaction

Total number of relatively more stable isomer(s) possible for octahedral complex [Cu(en)2(SCN)2] wiil be ______.

The number of interhalogens from the following having square pyramidal structure is :CIF3, IF7, BrF5, BrF3, I2CI6, IF5, CIF, CIF5

For the given first order reaction A → B, the half-life of the reaction is 0.3010 min. The ratio of the initial concentration of reactant to the concentration of reactant at time 2.0 min will be equal to ______. (Nearest integer)

Ka for butyric acid (C3H7COOH) is 2 × 10–5. The pH of 0.2 M solution of butyric acid is ______× 10–1. (Nearest integer) (Given log2 = 0.30)