List of top Chemistry Questions

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

Copper is refined 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

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

Consider the isoelectronic species, $Na^+$, $Mg^{2+}$, $F^-$ and $O^{2-}$. The correct order of increasing, length of their radii is

Consider the following sequence of conversion. $\underbrace{2NO +O_2}_{(X)}$ $ {<=>}$ $\underset{\text{(Y)}}{ {2NO2}}$ $ {<=>[\text{Cool}][\text{heat}]}$ $\underset{\text{(Z)}}{ {N2O4}}$ $X$, $Y$ and $Z$ can be described as

Consider the following reaction $ {C_6H_5NO_2 ->[Sn/HCl] X ->[C_6H_5COCl] Y + HCl}$ What is Y ?

Consider the dipole moments of $NH_3$ and $NF_3$.Which of the following is correct ?

Consider a titration of $ {K_2Cr_2O_7}$ solution with acidified Mohr?? salt solution using diphenylamine as indicator. The number of moles of Mohr?? salt required per mole of dichromate is

Conjugate base of $H_2$ is

Conductivity (unit Siemen's S) is directly proportional to area of the vessel and the concentration of the solution in it and is inversely proportional to the length of the vessel then the unit of the constant of proportionality is

Conductivity of 0.01 M NaCl solution is $0.00147ohm^{-1} cm^{-1}$. What happens to this conductivity if extra 100 mL of $H_2O$ will be added to the above solution ?

Composition of mischmetal is

Compound $C_2H_6O$ has two isomers $X$ and $Y$. On reaction with $HI$, $X$ gives alkyl iodide and water while $Y$ gives alkyl iodide and alcohol. Compounds $X$ and $Y$ are respectively

Complete the following reactions by filling the appropriate choice. (A) $6XeF_4 + 12H_2O \to 4Xe + 2XeO_3 +$ + (B) $XeF_6 + 3H_2O \to$ $+6HF$

Complete the given equations : (i) $Cu + 8HNO_3 \to 3Cu(NO_3)_2 +$ $+ 4H_2O$ (ii) $4Zn +10HNO_3 \to 4Zn(NO_3)_2 + 5H_2O+$ (iii) $I_2 + 10HNO_3 \to$ $+ 10NO_2 + 4H_2O$