List of top Chemistry Questions

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

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 :

In $XeO_3F_2$, the number of bond pair(s), $\pi$-bond(s) and lone pair(s) on $Xe$ atom respectively are :

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 ?

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 :

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

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

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 :

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

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

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

Monomer is

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

Which of the following transformation requires least energy ?

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

In the first order reaction
2N₂O₅ → 4NO₂ + O₂. If a mol L^-1 is the initial concentration of N₂O₅, the concentration of NO₂ at time t will be