List of top Chemistry Questions

Chemical formula of compound present in tooth enamel?

Consider the following electronic configuration:
Cu²⁺ = [Ar] 3d⁴4s⁰
Cu⁺ = [Ar] 3d¹⁰4s⁰
Which option is correct?

Which of the following has sp² hybridisation?

For the reaction:

Product (P) is

What is meant by positive and negative deviations from Raoult's law and how is the sign of \(∆_{mix}H\) related to positive and negative deviations from Raoult's law?

Molecular orbital σ* represents:

How many carbon atoms are there in a molecule of tyrosine?

In the test for phosphorus using ammonium molybdate, yellow precipitate of compound (X) is obtained. What is the oxidation state of molybdenum in (X)?

S-I: Blood is a buffer solution, whose pH is maintained at 7.4 by an acidic buffer. 
S-II: pH is maintained by HCO₃^-  and   H₂CO₃

Assertion: Kjeldahl method is not used for pyridine.
Reason: Nitrogen of pyridine does not change to ammonium sulphate under these conditions.

Which of the following is correct?

Which of the following are aromatic compounds?

The total number of compounds having Bond order 2 among the following are: F₂, N₂, Ne₂, O₂, Li₂, Be₂, C₂

Consider the following compound:

What is the IUPAC nomenclature of the compound?

Select the correct options:
Statement 1: Benzene sulphonyl chloride reacts with 1°, 2° and 3° amines.
Statement 2: All products of the reaction above are soluble in NaOH.

If de- Broglie wavelength of electron is equal to de- Broglie wavelength of proton, then what is the relation between their kinetic energy

Consider the given reaction:
Cr₂O₇^2- ⥨ CrO₄^2-
Above reaction shifts in forward direction in

Which of the following reaction defines $ \Delta H_{f}^{o} $ ?

For an endothermic reaction, $\Delta$H represents the enthalpy of the reaction in $kJ mol^{-1}$. The minimum amount of activation energy will be

Find out the magnitude of work done on the gas when 1 mole of an ideal gas undergoes compression from 9 liter to 1 liter through a reversible isothermal process. (in Joule) (Nearest integer)

Find the mass (in g) of O₂ required for the combustion of 900 g of glucose.

Which of the following compounds will not give Hinsberg's test

X ⇌ Y;K₁ = 1
Y ⇌ Z; K₂ = 2
Z ⇌ W; K₃ = 4
Find K_eq for X ⇌ W

CoCl₃.xNH₃ on reaction with excess AgNO₃(aq.) gives two moles of AgCl as precipitate.
Summation of oxidation state of Co in CoCl₃.xNH₃ and x is:

Statement-I : Stability of +1 oxidation state increases as Ga< In < Tl
Statement-II : Stability of +1 oxidation state increases down the group due to inert pair effect.