List of top Chemistry Questions

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 ?

Compound 'A' of molecular formula $C_4H_{10}O$ on treatment with Lucas reagent at room temperature gives compound ?B\ When compound ?B? is heated with alcoholic $KOH$, it gives isobutene. Compound ?A? and ?B? are respectively

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

If $50\%$ of a reaction occurs in $100$ second and $75\%$ of the reaction occurs in $200$ second, the order of this reaction 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 ?

Which of the following statements is false?

If M is element of actinoids series, the degree of complex formation decreases in the order.

A chemical reaction was carried out at 300 K and 280 K. The rate constant were found to be \(k_1\) and \(k_2\) respectively, then

Which of the following compound can exhibit tautomerism?

Which of the following is the correct sequence of step involved in the mechanism of Cannizzaro reaction?

When phenol is treated with \(CHCl_3\) and \(NaOH\) followed by acidification, salicylaldehyde is obtained. Which of the following species is involved in the above mentioned reaction as intermediates?

Red blood cells are placed in a solution and neither haemolysis nor crenation occurs. Therefore, the solution is

When hydrogen peroxide is added to acidified solution of dichromate \(Cr_2O_7^{2-}\), a deep blue coloured complex of chromic peroxide \(CrO_5\) is formed. Oxidation state of \(Cr\) in \(CrO_5\) is

\(CH_3-Br \xrightarrow{\text {Mg/ether}} \xrightarrow{(i)CO_2 \ (ii)Water} \xrightarrow{\Delta,\ CH_3OH/H^+}P\)
What is the product P in the above reaction?

Which of the following is disproportionation reaction?