List of top Chemistry Questions

In diamond, each carbon atom is bonded to four other carbon atoms forming a:
The allotrope of carbon that is a good conductor of heat and electricity is:
Which of the following shows addition reaction?
The number of molecules involved in a molecular reaction is called:
The rate of homogeneous reaction is affected by:
The main function of enzymes in organic reactions is to:
Which element is always present in organic compounds?
What is the chemical formula of rust?
What does pH value indicate in water?

उन अभिकर्मकों का चयन कीजिए जो नाइट्राइलों को प्राथमिक ऐमीनों में अपचित करते हैं। 
A. (i) LiAlH\(_4\); (ii) H\(_2\)O 
B. Sn + HCl 
C. H\(_2\)/Ni 
D. Na(Hg)/C\(_2\)H\(_5\)OH 
E. Br\(_2\)/जलीय NaOH 
नीचे दिए गए विकल्पों में से सही उत्तर का चयन कीजिए: 
 

The BOD of highly polluted water is
The oxide of nitrogen responsible for depletion of ozone layer is
Which of the following in not to be considered as a primary fuel?
The polymer used in making gaskets and non-stick coating utensils is
The structure of Buna-S polymer is
Which of the following is a natural polymer?
During Vulcanization of raw rubber, the chemical added to it is
In galvanised iron
Identify the incorrect statement about the corrosion
The type of functional group associated with cation exchange resin is
A sample of water is known to contain $Mg(HCO_{3})_{2} = 7.3$ mg/L, $Ca(HCO_{3})_{2} = 8.1$ mg/L and $27.2$ mg/L of $CaSO_{4}$. The total hardness associated with water sample (in ppm) in equivalents of $CaCO_{3}$ is
The exhausted anion-exchange resin is regenerated with
Which of the following is a weak electrolyte?
The wrong statement regarding Galvanic cell is
Electrolysis of an aqueous solution of $Na_{2}SO_{4}$ between Pt electrodes liberate a gas X at anode and gas Y at cathode. X and Y respectively are}