List of top Chemistry Questions

$NO_2$ gas is :
How many Coulombs are required to oxidise 0.1 mole of H2O to oxygen?
For the reaction, A ⇌ B, Ea = 50 kJ mol−1 and ΔH = −20 kJ mol−1. When a catalyst is added, Ea decreases by 10 kJ mol−1. What is the Ea for the backward reaction in the presence of catalyst?
For the reaction PCl5​→PCl3​+Cl2​, the rate and rate constant are 1.02×10−4mol L−1s−1 and 3.4×10−5s−1, respectively, at a given instant. The molar concentration of PCl5​ at that instant is:
Which one of the following pairs will show positive deviation from Raoult's Law?
The value of 'A' in the equation \( \lambda_m = \lambda_m^0 - A\sqrt{C} \) is same for the pair
A current of 3 A is passed through a molten calcium salt for 1 hr 47 min 13 sec. The mass of calcium deposited is:
Which of the following crystals has the unit cell such that \( a = b \neq c \) and \( \alpha = \beta = 90^\circ, \gamma = 120^\circ \)?
MnO exhibits:
The number of atoms in 4.5 g of a face-centred cubic crystal with edge length 300 pm is:
Vapour pressure of a solution containing 18 g of glucose and 178.2 g of water at 100°C is:
(Vapour pressure of pure water at 100°C = 760 torr)
A mixture of phenol and aniline shows negative deviation from Raoult's law. This is due to the formation of:
The first chlorinated organic insecticide prepared is:
Which one of the following properties is generally not applicable to ionic hydrides?
Which one of the following nitrates will decompose to give NO₂ on heating?
In the reaction between moist SO₂ and acidified permanganate solution:
0.48 g of an organic compound on complete combustion produced 0.22 g of CO₂. The percentage of C in the given organic compound is:
In the given sequence of reactions, identify ‘P’, ‘Q’ and ‘S’ respectively:
Chemical Reaction
Which of the following halides cannot be hydrolysed?
Which of the following statements are true about [CoF6]3− ion?
I) The complex has octahedral geometry.
II) Coordination number of Co is 3 and oxidation state is +6.
(III) The complex is sp3d2 hybridised.
(IV) It is a high spin complex.
The complex compounds [Co(NH₃)₅SO₄]Br and [Co(NH₃)₅Br]SO₄ are:
2-Methylpropane can be prepared by Wurtz reaction. The haloalkanes taken along with metallic sodium and dry ether are:
On treating 100 mL of 0.1 M aqueous solution of the complex CrCl₃.6H₂O with excess of AgNO₃, 2.86 g of AgCl was obtained. The complex is:
In the analysis of III group basic radicals of salts, the purpose of adding NH₄Cl (solid) to NH₄OH is:
A haloalkane undergoes $S_{N^2}$ or $S_{N^1}$ reaction depending on: