List of top Chemistry Questions

For given reaction: 
Reaction
‘P’ is
The products A and B obtained in the following reactions, respectively, are
3ROH+PCI3→3RCI+A 
ROH+PCI5→RCI+HCI+B
The rate of a reaction quadruples when temperature changes from 27°c to 57°c. Calculate the energy of activation
Given R=8.314 J K-1 mol-1, log 4=0.6021
During the preparation of Mohr’s salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of Fe2+ ion?
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 )
Oxygen gains ____________________ electrons during the chemical changes.
Element with atomic number 17 belongs to
Which one of the following atoms is smaller in size?
Number of bond pairs and lone pairs in the valence shell of nitrogen in NH\(_3\)
Number of elements present in the sixth period of the modern periodic table
Bond angle in BeCl\(_2\) molecule is
Ionization energy along a period from left to right generally
Polar covalent bond present in
Law of octaves was proposed by
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
Which one of the following is a ketone?
The number of sigma and \(\pi\)-bonds in ethyne molecule:
The colour of methyl orange indicator in basic solution is
The reaction of an acid with a base to give a salt and water is known as
Number of unpaired electrons present in carbon atom is
Which one of the following is used for disinfecting drinking water?
What is the symbol used in a chemical equation to represent the gas evolved in a reaction?
Double bond present in
Maximum no. of electrons in a subshell is equal to