List of top Chemistry Questions

The number of 2 -centre- 2 -electron and 3-centre-2-electron bonds in $B _{2} H _{6}$, respectively, are :

The number of water molecule(s) not coordinated to copper ion directly in $CuSO_4.5H_2O$, is :

The ore that contains both iron and copper is:

The oxoacid of sulphur that does not contain bond between sulphur atoms is :

The percentage composition of carbon by mole in methane is :

The pH of a 0.02M $NH_4Cl$ solution will be [given $K_b(NH_4OH) = 10^{-5}$ and log2=0.301]

The $pH$ of rain water, is approximately :

The process with negative entropy change is :

The product formed in the reaction of cumene with $O_2$ followed by treatment with dil. $HCl$ are :

The ratio of number of atoms present in a simple cubic, body centered cubic and face centered cubic structure are, respectively :

Two pi and half sigma bonds are present in:

What is the IUPAC name of the following compound ?

What is the molar solubility of $Al(OH)_3$ in $0.2\, M\, NaOH$ solution ? Given that, solubility product of $Al(OH)_3 = 2.4 \times 10^{-24}$ :

What would be the molality of $20\%$ (mass / mass) aqueous solution of $KI$? (molar mass of $KI = 166\, g\, mol^{-1}$)

When the first electron gain enthalpy $( \Delta_{eg}H) $ of oxygen is $-141\, kJ/mol$, its second electron gain enthalpy is :

Which amongst the following is the strongest acid ?

Which is the most suitable reagent for the following transformation ?

Which is wrong with respect to our responsibility as a human being to protect our environment ?

Which of the following compounds is not aromatic ?

Which of the following compounds will show the maximum enol content?

With respect to an ore, Ellingham diagram helps to predict the feasibility of its -

Wilkinson catalyst is :

Which of the following statements is not true about RNA?

Which of the following is a thermosetting polymer?

Which of the following is a condensation polymer?