List of top Chemistry Questions

Which of the following is present in maximum amount in �acid rain� ?

Which symbol replaces the unit of atomic mass, amu?

Compound $A, C_8H_{10}O$, is found to react with $NaOI$ (produced by reacting $Y$ with $NaOH$) and yields a yellow precipitate with characteristic smell. $A$ and $Y$ are respectively

Which of the following is secondary pollutant?

Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity ?

Methoxybenzene on treatment with HI produces

Equal weights of ethane and hydrogen are mixed in an empty container at $25^{\circ}C$. The The fraction of total pressure exerted by hydrogen is

Out of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one ?

The increasing order of basicity of the following compounds is :

Which of the following statements about colloids is False?

For $Na^{+}, Mg^{2+}, F^{-}$ and $O^{2-}$; the correct order of increasing ionic radii is :

Which of the following statements is false?

In a complexometric titration of metal ion with ligand $M ($ Metal ion $)+ L ($ Ligand $) \rightarrow C ($ Complex $)$ end point is estimated spectrophotometrically (through light absorption). If 'M' and 'C' do not absorb light and only 'L' absorbs, then the titration plot between absorbed light ( $A$ ) versus volume of ligand 'L' $(V)$ would look like

The bond dissociation energies of $X_2 , Y_2$ and $XY $ are in the ratio of $1 : 0.5 :1. \Delta H$ for the formation of $XY$ is - $200\, kJ\, mol^{-1}$. The bond dissociation energy of $X_2$ will be

The two functional groups characteristic of sugars are

On which of the following properties does the coagulating power of an ion depend ?

Excess of ammonia with sodium hypochloride solution in the presence of glue or gelatin gives

Considering Ellingham diagram, which of the following metals can be used to reduce alumina ?

The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is

In the extraction of copper from its sulphide ore, metal is finally obtained by the oxidation of cuprous sulphide with :

Which one of the following is not a property of physical adsorption?

The increasing order of diazotisation of the following compounds is :

Relative stabilities of the following carbocations will be in the order

In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces ?X?. When $CO_2$ gas is passed through the aqueous solution of ?X?, a hydrated compound ?Y? is precipitated. ?X? and ?Y? respectively are :

In which case is the number of molecules of water maximum ?