List of top Chemistry Questions

The oxide that shows magnetic property is :

Given below are two statements : Statement I : C₂H₅OH and AgCN both can generate nucleophile. Statement II : KCN and AgCN both will generate nitrile nucleophile with all reaction conditions. Choose the most appropriate option :

In the following molecule,

Hybridisation of Carbon a, b and c respectively are :

Main Products formed during a reaction of 1-methoxy naphthalene with hydroiodic acid are :

Consider the above reaction, the product 'X' and 'Y' respectively are

An organic compound "A" on treatment with benzene sulphonyl chloride gives compound B. B is soluble in dil. NaOH solution. Compound A is :

The compound which shows metamerism is :

Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature ?

From the following pairs of ions which one is not an iso-electronic pair?

Statement I : The codon 'AUG' codes for methionine and phenylalanine. Statement II : 'AAA' and 'AAG' both codons code for the amino acid lysine. In the light of the above statements, choose the correct answer from the options given below.

An organic compound contains $78 \%$ (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is: [Atomic wt. of $C$ is $12, H$ is $1$]

Consider the above reaction and identify the missing reagent/chemical.

For a reaction A$\rightarrow$B, the enthalpy of the reaction is −4.2 kJ mol⁻¹ and the enthalpy of activation is 9.6 kJ mol⁻¹. The correct potential energy profile for the reaction is shown in option

Choose the correct option for the total pressure (in atm.) in a mixture of 4 g O₂ and 2 g H₂confined in a total volume of one litre at 08C is : [Given R=0.082 L atm mol⁻¹K⁻¹, T=273 K]

For irreversible expansion of an ideal gas under isothermal condition, the correct option is

The correct option for the value of vapor pressure of a solution at 45$^{\circ}$C with benzene to octane in molar ratio 3 : 2 is : [At 45$^{\circ}$C vapor pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume Ideal gas]

The structures of beryllium chloride in solid state and vapor phase, are

Deficiency of vitamin K causes :

10.0 mL of Na₂CO₃ solution is titrated against 0.2 M HCl solution. The following titre values were obtained in 5 readings: 4.8 mL, 4.9 mL, 5.0 mL, 5.0 mL and 5.0 mL. Based on these readings, and convention of titrimetric estimation the concentration of Na₂CO₃ solution is ________ mM. (Round off to the Nearest Integer).

The number of species below that have two lone pairs of electrons in their central atom is _________. (Round off to the Nearest Integer). SF₄, BF₄⁻, ClF₃, AsF₃, PCl₅, BrF₅, XeF₄, SF₆

The gas phase reaction 2A(g) ⇌ A₂(g) at 400 K has ΔG° = +25.2 kJ mol⁻¹. The equilibrium constant K_p for this reaction is _________ × 10^{-2}. (Round off to the Nearest Integer). [Use : R = 8.3 J mol⁻¹ K⁻¹, ln 10 = 2.3, log₁₀ 2 = 0.30, 1 atm = 1 bar, antilog (-0.3) = 0.501]

A solute A dimerizes in water. The boiling point of a 2 molal solution of A is 100.52°C. The percentage association of A is _________. (Round off to the Nearest Integer). [Use : K_b for water = 0.52 K kg mol⁻¹, Boiling point of water = 100°C]

The solubility of CdSO₄ in water is 8.0 × 10^{-4} mol L^{-1}. Its solubility in 0.01 M H₂SO₄ solution is ________ × 10^{-6} mol L^{-1}. (Round off to the Nearest Integer). (Assume that solubility is much less than 0.01 M)

The molar conductivities at infinite dilution of barium chloride, sulphuric acid and hydrochloric acid are 280, 860 and 426 S cm² mol⁻¹ respectively. The molar conductivity at infinite dilution of barium sulphate is ________ S cm² mol⁻¹. (Round off to the Nearest Integer).

A reaction has a half life of 1 min. The time required for 99.9% completion of the reaction is ________ min. (Round off to the Nearest Integer). [Use : ln 2 = 0.69; ln 10 = 2.3]