List of top Chemistry Questions

On treatment of propanone with dilute \(Ba(OH)_2\), the product formed is

Formation of cyanohydrin from a ketone is an example of

A radioactive element \(X\) emits \(3\alpha\), \(1\beta\) and \(1\gamma\)-particles and forms \({}^{76}_{35}Y\). Element \(X\) is

The activity of an old piece of wood is just \(25%\) of the fresh piece of wood. If \(t_{1/2}\) of \(C\text{-}14\) is \(6000\,yr\), the age of piece of wood is

Mg is an important component of which biomolecule occurring extensively in living world?

The fatty acid which shows reducing property is

Glycerol on treatment with oxalic acid at \(110^\circ C\) forms

The reaction, \(ROH + H_2CN_2\) in the presence of \(HBF_4\), gives the following product

Which metal aprons are worn by a radiographer to protect him from radiation?

Transition metals usually exhibit highest oxidation states in their

Which of the following converts \(CH_3CONH_2\) to \(CH_3NH_2\)?

Sterling silver is

Identify the statement which is not correct regarding \(CuSO_4\).

Nitrobenzene can be converted into azobenzene by reduction with

The one which is least basic is

Which of the following compounds is not coloured?

Across the lanthanide series, the basicity of the lanthanide hydroxides

The formula of ethyl carbinol is

Which of the following gives red colour in Victor Meyer’s test?

Enthalpy of a compound is equal to its

For which one of the following reactions will there be a positive \(\Delta S\)?

When p-nitrobromobenzene reacts with sodium ethoxide, the product obtained is

In the reaction sequence:
\[ \text{C}_2\text{H}_5\text{I} \xrightarrow{\text{Alcoholic KOH}} X \xrightarrow{\text{Br}_2/\text{CCl}_4} Y \xrightarrow{\text{KCN}} Z \xrightarrow{H_3O^+} A \] The product \(A\) is

Three separate samples of a solution of a single salt gave these results. One formed a white precipitate with excess ammonia solution, one formed a white precipitate with dil. $HCl$ solution and one formed a black precipitate with $H_{2} S$. The salt could be

Liebig? method is used for the estimation of