List of top Chemistry Questions

The wavenumber of the first spectral line of the Lyman series of He\(^+\) ion is \( x \) m\(^{-1}\). What is the wavenumber (in m\(^{-1}\)) of the second spectral line of the Balmer series of Li\(^{2+}\) ion?
Choose the correct statements from the following: I) In vapour phase, \( BeCl_2 \) exists as a chlorobridged dimer.
II) \( BeSO_4 \) is readily soluble in water.
III) \( BeO \) is completely basic in nature.
IV) \( BeCO_3 \), being unstable, is kept in the atmosphere of \( CO_2 \).
V) \( BeCO_3 \) is less soluble among all the carbonates of group 2 elements.
Observe the following species: (i) \( NH_3 \) (ii) \( AlCl_3 \) (iii) \( SnCl_4 \) (iv) \( CO_2 \) (v) \( Ag^+ \) (vi) \( HSO_4^- \) How many of the above species act as Lewis acids?
The normality of a 20-volume solution of hydrogen peroxide is:

In the given reaction sequence, identify Z.

Reaction of conversion of Y to Z in the given reaction corresponds to: 

A solid is dissolved in 1 L water. The enthalpy of its solution (\(\Delta H_{{sol}}^\circ\)) is 'x' kJ/mol. The hydration enthalpy (\(\Delta H_{{hyd}}^\circ\)) for the same reaction is 'y' kJ/mol. What is lattice enthalpy (\(\Delta H_{{lattice}}^\circ\)) of the solid in kJ/mol? 

What is 'C' in the given sequence of reactions?

Which of the following vitamins are water soluble?
Gutta percha is:
Pyrolusite ore is:
The banana bond in diborane is constituted by:
Formic acid on heating with concentrated H\(_2\)SO\(_4\) gives:
The following amines is the product of Gabriel phthalimide synthesis:
Which type of linkage is present in nucleic acids?
Which is prepared by peptisation?
Consider the argon atom. For how many electrons does this atom have \( m_l = 1 \)?
Which is the strongest acid?

Identify the set, in which X and Y are correctly matched:

0.592 g of copper is deposited in 60 minutes by passing 0.5 amperes current through a solution of copper (II) sulphate. The electro chemical equivalent of copper (II) in g/C is:
What is the structural formula of simplest ketone?
Reactivity increasing order of the following metals will be
60 cm\(^3\) of SO\(_2\) gas diffused through a porous membrane in \( x \) minutes. Under similar conditions, 360 cm\(^3\) of another gas (molar mass 4 g mol\(^{-1}\)) diffused in \( y \) minutes. The ratio of \( x \) and \( y \) is:
Given below are two statements:
Statement I: Bromination of phenol in a solvent with low polarity such as CHCl\(_3\) or CS\(_2\) requires a Lewis acid catalyst.
Statement II: The Lewis acid catalyst polarizes the bromine to generate \( \text{Br}^+ \).
In light of the above statements, choose the correct answer from the options given below:
What do you observe on pouring potassium hydroxide on red and blue litmus papers?