List of top Chemistry Questions

Each edge of a cubic unit cell is 400 pm long. If the atomic mass of the element is 120 and its density is 6.25 g cm⁻³, the crystal lattice is:
(Use \(N_A = 6 \times 10^{23}\) mol⁻¹)

Chloroform, CHCl₃, boils at 61.7°C. If Kb for chloroform is 3.63°C/molal, what is the boiling point of a solution of 15.0 g of CHCl₃ and 0.616 kg of acenaphthalene (C₁₂H₁₀)?

The rate constant of a reaction is 1.5×10⁻³ at 25°C and 2.1×10⁻² at 60°C. The activation energy is:

Which feature of catalysts is illustrated by the following reactions?
(i) CO(g) + 2 H₂(g) → Cu/ZnO-Cr₂O₃ → CH₃OH(g)
(ii) CO(g) + H₂(g) → Cu → HCHO(g)
(iii) CO(g) + 3 H₂(g) → Ni → CH₄(g) + H₂O(g)

The IUPAC name of the compound is: 

The accompanying figure depicts a change in concentration of species A and B of the reaction A → B, as a function of time. The point of intersection of the two curves represents:

Phenol reacts as shown: PhenolxrightarrowNaOH[X]CH₂=CHCH₂Cl[Y] Here [Y] is: 

Which of the following is a diamine?
Arrange the following alcohols in increasing order of their reactivity towards reaction with HCl: (1) CH₃CH₂OH, (2) (CH₃)₂CHOH, (3) (CH₃)₃COH
When an aqueous solution of copper(II) sulphate is saturated with ammonia, the blue compound crystallises on evaporation. The formula of this blue compound is:
Following compounds are given: (1) CH₃CH₂OH (2) CH₃COCH₃ (3) CH₃-CHOH-CH₃ (4) CH₃OH Which of the above compound(s), on being warmed with iodine solution and NaOH, will give iodoform?
Which one of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour? (At. Nos.: Cr = 24, Mn = 25, Fe = 26, Co = 27)
Freundlich equation for adsorption of gases (in amount of x g) on a solid (in amount of m g) at constant temperature can be expressed as:
Which of the following element do not form complex with EDTA?
Pick out the wrong statement.
Which of the following is not a member of chalcogens?
The pH of a 0.1M monobasic acid is found to be 2. Hence, its osmotic pressure at a given temperature T is:
On passing a current of 1.0A for 16 min and 5 s through one litre of CuCl₂ solution, all copper of the solution was deposited at cathode. The strength of the CuCl₂ solution was (Molar mass of Cu = 63.5; Faraday constant = 96,500C mol⁻1):
A 100.0mL dilute solution of Ag⁺ is electrolysed for 15.0 minutes with a current of 1.25mA and the silver is removed completely. What was the initial [Ag⁺]?
Identify the incorrect statement from the following:
Which of the following will have a meso-isomer also?
Following are colours shown by some alkaline earth metals in flame test. Which of the following are not correctly matched? |c|c| Metal & Colour
(i) Calcium & Apple green
(ii) Strontium & Crimson
(iii) Barium & Brick red
Consider the reactions (A) H₂O₂ + 2HI → I₂ + 2H₂O (B) HOCl + H₂O₂ → H₃O⁺ + Cl⁻ + O₂ Which statement is correct about H₂O₂ with reference to these reactions?
Which of the following is the strongest nucleophile?
An element X occurs in short period having configuration ns²np¹. The formula and nature of its oxide is: