List of top Chemistry Questions

The false statement among the followings:
The atomic radius of atom is r. Total volume of atoms present in an fcc unit cell of an element is:
Which one of the following statements is false?
The degree of dissociation of Ca(NO₃)₂ in a dilute aqueous solution containing 7.0 g of salt per 100 g of water at 100C is 70%. If vapour pressure of water at 100C is 760 mm Hg, the vapour pressure of the solution is:
When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are: c c Cathode & Anode
The conductivity of a saturated solution of BaSO₄ is 3.06 × 10⁻⁶ Ω⁻¹cm⁻¹ and its equivalent conductance is 1.53 Ω⁻¹cm²eq⁻¹. The Kₛp for BaSO₄ is:
A cell that utilises the reaction Zn(s) + 2H^+(aq) Zn²⁺(aq) + H₂(g) addition of H₂SO₄ to cathode compartment, will:
The chemical reaction 2O₃ → 3O₂ proceeds as follows: O₃ fast O₂ + O O + O₃ slow 2O₂ The rate law expression should be:
Among the following statements the incorrect one is:
Cinnabar is an ore of:
Which of the following is used in the preparation of chlorine?
Which of the following elements does not belong to the first transition series?
[EDTA]⁴⁻ is a:
Which of the following order is not correct?
When esters are hydrolysed the product which gives hydrogen ions is:
Which of the following compound cannot be used in preparation of iodoform?
Which of the following compound is obtained by heating ammonium cyanate?
Which of the following statements about vitamin B₁₂ is incorrect?
Ammonia forms the complex ion [Cu(NH₃)₄]²⁺ with copper ions in alkaline solutions but not in acidic solutions. What is the reason for it?
An aqueous solution of a substance gives a white precipitate on treatment with dil. HCl which dissolves on heating. When H₂S is passed through the hot acidic solution, a black precipitate is obtained. The substance is a:
The one which is least basic is:
For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass over a liquid metal which does not solidify before glass. The metal used can be
Interparticle forces present in nylon-66 are:
If the equilibrium constant of the reaction 2HI H₂ + I₂ is 0.25, then the equilibrium constant for the reaction H₂ + I₂ 2HI would be
At 25°C and 1 bar which of the following has a non-zero Δ Hf^ ?