List of top Chemistry Questions

The plot of osmotic pressure II) vs concentration (mol L–1 ) for a solution gives a straight line with slope 25.73 L bar mol–1 . The temperature at which the osmotic pressure measurement is done is
(Use R = 0.083 L bar mol–1 K–1 )
Which one of the following atoms is smaller in size?
Ionization energy along a period from left to right generally
Number of bond pairs and lone pairs in the valence shell of nitrogen in NH\(_3\)
Oxygen gains ____________________ electrons during the chemical changes.
Law of octaves was proposed by
Element with atomic number 17 belongs to
If the hydrogen atom of -COOH gets replaced by 'R' (alkyl group) _______________ are obtained.
The hydrocarbons containing only single bonds between carbon atoms are called
The colour of methyl orange indicator in basic solution is
The metal that occurs in the free form (native) is
Which of the following is an unsaturated compound?
In smelting the ore it is
Double bond present in
The process of conversion of starches and sugars to C2H5OH is called
Galena is an ore of
Maximum no. of electrons in a subshell is equal to
Quantum mechanical model of the atom was developed by
Which one of the following is used for disinfecting drinking water?
The reaction of an acid with a base to give a salt and water is known as
What is the symbol used in a chemical equation to represent the gas evolved in a reaction?
Number of unpaired electrons present in carbon atom is
An open vessel containing air was heated from 27°C to 727°C. Some air was expelled. What is the fraction of air remaining in the vessel? (Assume air as an ideal gas)

Arrange the following redox couples in the increasing order of their reducing strength:
Cu$^{2+}$/Cu$^{+}$ $E^\circ = -0.34$ V
Ag$^+$/Ag $E^\circ = -0.8$ V
Ca$^{2+}$/Ca  $E^\circ = +2.87$ V
Cr$^{3+}$/Cr$^{2+}$  $E^\circ = +0.74$ V

Match the Vitamins given in Column I with the diseases caused by their deficiency as given in Column II.