List of top Chemistry Questions

Lead is extracted from galena (PbS), either by following ways.

For the following reaction,
\(2NH_3(g)+CO_2(g)⇋NH_2CONH_2(aq)+H_2O(l)\)
△G°=-13.6 kJmol^-1 at 298 K. Then log K_eq for this eq equilibrium is

Xenon hexafluoride reacts with silica to form a compound \(X\). The oxidation state of xenon in \(X\) is

In the reaction,

The major product formed is:

What is the formula of Marshalls acid?

Which one of the following species is paramagnetic in nature?

Final product will be:

Oxidation number of \(Cr\) in \([Cr(NH_3)_4Cl_2]^+\)

In the extraction of copper from its sulphide ore, the metal is formed by the reduction of \(Cu_2O\) with

Find relation b/w

Which is suitable reagent for wurtz reaction:

Which of the following pair behaves strong and weak base hydride \(NH_3, PH_3, AsH_3, SbH_3, BiH_3\)

Which of the following becomes paramagnetic on heating at 850 K?

Find out products of hydrolysis of NaCl solution on cathode and anode

When metal ? $M$ ? is treated with $NaOH$, a white gelatinous precipitate ?$X$? is obtained, which is soluble in excess of $NaOH$. Compound ?$X$? when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal ?$M$? is :

Regarding cross-linked or network polymers, which of the following statements is incorrect ?

Which of the following best describes the diagram below of a molecular orbital ?

For an isothermal reversible expansion process, the value of q can be calculated by the expression

Why only As³⁺ gets precipitated as As₂S₃ and not Zn²⁺ as ZnS when H₂S passed through an acidic solution containing As³⁺ and Zn²⁺ ?

P is

Osmotic pressure of 0.4% urea solution is 1.64 atm and that of 3.42% cane sugar is 2.46 atm. When the above two solutions are mixed, the osmotic pressure of the resulting solution is :

Flocculation value of BaCl₂ is much less than that of KCl for sol A and flocculation value of Na₂SO₄ is much less than that of NaBr for sol B. The correct statement among the following is :

Among the following pairs of complexes, in which case the Δ₀ value is higher for the first one ?

If radiation corresponding to second line of 'Balmer series' of Li²⁺ ion, knocked out electron from first excited state of H-atom, then kinetic energy of ejected electron would be :