List of top Chemistry Questions

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

What is the formula of Marshalls acid?

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

Find relation b/w

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

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

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 :

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

The energy of second Bohr orbit of the hydrogen atom is -328 kJ mol^-1, hence the energy of fourth Bohr orbit would be :

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 :

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 ?

For the reaction taking place at certain temperature
NH₂COONH₄ (s) ⇌ 2NH₃ (g) +CO₂ (g)
If equilibrium pressure os 3X bar then Δ_tG° would be

0.5 mole of each H₂, SO₂ and CH₄ are kept in a container. A hole was made in the container. After 3h, the order of partial pressures in the container will be

Following table represents critical temperature of some gases.
Arrange these gases in their increasing order of liquification

Gas	H2	He	N2	O2
Tc/K	33.2	5.3	126	154.3

Monomer is

The insecticide containing 99% γ -isomer of benzene hexachloride is know as

On adding AgNO³ solution into KI solution, a negatively charged colloidal sol is obtained when they are in :

Which of the following transformation requires least energy ?

Heavy water reacts respectively with CO₂, SO₃, P₂O₅ and N₂O₅ to give the compounds.