List of top Chemistry Questions

$\Delta H$ for the reaction, $OF_2 + H_2O \to O_2 + 2HF$ $(B.E.$ of $O ?

Dehydration of alcohols to ethers is catalysed by :

Decreasing order of boiling points among ethanol, butan-1-ol, butan-2-ol and methanol is

$ {D-(+)-Glucose ->[5(CH_3CO)_2O]D-(+)-Glucose \,pentaacetate}$ Which statement(s) is/are true about glucose pentaacetate?

Cyclone collector is used for minimising

Cyclohexane when treated with $Br_2\, in\, CCl_4$ gives

Cyclohexanone is subjected to reduction by $NaBH_4$. The product formed is

$CuSO_{4} \cdot 5H_{2}O$ is blue in colour while $CuSO_{4}$ is colourless due to

Cupellation is used in the metallurgy of

Crystalline form of sulphur stable at room temperature is

$CsBr$ has $bcc$ structure with edge length $4.3\,?$ The shortest inter ionic distance in between $Cs^+$ and $Br^-$ is

$ {Cu_2S + 2Cu_2O -> 6Cu + SO_2}$ In which process of metallurgy of copper, above equation is involved?

Crude common salt is hygroscopic because of impurities of

$ {Cr^{+3}}$ in aquous medium form green coloured complex with $ {NH_3}$ ligand. How many ligand associated

$CrCl_{3} \cdot 6H_{2}O$ exists in different isomeric forms which show different colours like violet and green. This is due to

Covalency of oxygen cannot exceed $2$ unlike sulphur which can show $+4$ or $+6$ because

$ {Cr_2 O^{2-}_7 ->[H^+] Cr^{3+} , }$ E wt of $ {Cr_2 O^{2-}_7}$ is

Corrosion is basically a

Copper matte is put in silica lined converter to

Copper pyrites is concentrated by

Coordination number of $Zn$ in $ZnS$ (Zine blende) is

Coordination number of Cr is six. A complex ion of Cr with $C_2O_4^{ 2-}$, en and superoxide ion, $O_2^ -$ has the formula $[Cr(C_2O_4)_x(en)_y(O_2)_z]^-$. The ratio x : y : z will be

Copolymer is

Copper is refined by

Conversion of phenol to salicylic acid and to salicyaldehyde are known as (respectively)