List of top Chemistry Questions

In the following reaction, X is an intermediate and Y is one of the end products. 

Which one of the following compounds is the end product Y? 


 

Which one of the following compounds is the simplest alkane that is optically active? 


 

The following carboxylic acids have a general formula, R-COOH.
(i) HCOOH
(ii) CH\(_3\) - COOH
(iii) ClCH\(_2\) - COOH
(iv) CF\(_3\) - COOH
Which one of the following represents the decreasing order of their respective pK\(_a\) values?
Which one of the following ions has the maximum number of unpaired electrons?

For an ideal gas at room temperature, choose the CORRECT representation(s) of Boyle's Law. 
(P = Pressure, V = Volume, T = Temperature) 

If 8 g of a non-electrolyte solute is dissolved in 114 g of n-octane to reduce its vapour pressure to 80%, the molar mass (in g mol-1) of the solute is
[Given that the molar mass of n-octane is 114 g mol-1.]
Titanium tetrachloride (TiCl$_4$) reacts with THF to form an octahedral complex X under inert atmosphere at 25°C. If 5.0 g of TiCl$_4$ is used and the yield is 80%, the amount of X (in grams) formed is .......... (Round off to one decimal place) (Use atomic weights: Ti = 48, Cl = 35.5, O = 16, C = 12, H = 1)
The nucleobase NOT found in DNA is
The volume (in mL) required to prepare 350 mL of 1X buffer solution from a fifty times (50X) concentrated buffer stock solution is ..........
In a typical mammalian cell, the protein content is 20 % of its net weight. If the density and volume of the cell are 1.2 g/mL and 4 × 10\(^{-9}\) mL, respectively, then the concentration (in mg/mL) of the protein is
For following reactions ${A ->[700\,K][] Product}$ ${A ->[500\,K][{\text{catalyst}}] Product}$ it was found that the $E_a$ is decreased by 30 k J/mol in the presence of catalyst. If the rate remains unchanged, the activation energy for catalysed reaction is (Assume pre exponential factor is same):
The de Broglie wavelength of an electron in the $4^{th}$ Bohr orbit is :
Complex X of composition $Cr(H_2O)_6Cl_n$ has a spin only magnetic moment of 3.83 BM. It reacts with $AgNO_3$ and shows geometrical isomerism. The IUPAC nomenclature of X is :
A sample of red ink (a colloidal suspension) is prepared by mixing eosin dye, egg white, $HCHO $ and water. The component which ensures stability of the ink sample is :-
Consider the reaction $A \rightleftharpoons B$ at $1000\, K$ At time '$t$', the temperature of the system was increased to $2000 \,K$ and the system was allowed to reach equilibrium. Throughout this experiment the partial pressure of $A$ was maintained at $1$ bar. Given below is the plot of the partial pressure of $B$ with time. What is the ratio of the standard Gibbs energy of the reaction at $1000\, K$ to that at $2000\, K$ ?
standard Gibbs energy

in the reaction

MgBr+CH3NH2 Dry ether

MgBr+CH3NH2 Dry ether the number of possible isomers for the organic compound is 

In which of the following molecule, the bond angle is 107°48'?
The electronic configurations of bivalent europium and trivalent cerium are : (atomic number: $Xe = 54, Ce =58, Eu ??63$)
The number of bonds between sulphur and oxygen atoms in $S_2O^{2-}_8$ and the number of bonds between sulphur and sulphur atoms in rhombic sulphur, respectively, are:
An acidified solution of $0.05 \,M\, Zn ^{2+}$ is saturated with $0.1 \,M \,H _{2} S$. What is the minimum molar concentration $(M)$ of $H ^{+}$required to prevent the precipitation of $ZnS$ ?
Use $K_{s p}( ZnS )=1.25 \times 10^{-22}$ and overall dissociation constant of $H _{2} S. K _{ NET }=K_{1} K_{2}=1 \times 10^{-21}$
Which of the following liberates $O _{2}$ upon hydrolysis?
With respect to the compounds I-V, choose the correct statement(s).
With respect to the compounds I-V
Cast iron is used for the manufacture of :
The major product formed in the following reaction is : $CH _{3} CH = CHCH \left( CH _{3}\right)_{2} \stackrel{ HBr }{\longrightarrow}$
If enthalpy of atomisation for $Br_{2(I)}$ is $x \,kJ/mol$ and bond enthalpy for $Br_2$ is $y\, kj/mol$, the relation between them :