List of top Chemistry Questions

For a first order reaction, the initial concentration of a reactant is 0.05 M. After 45 min it is decreased by 0.015 M. Calculate halfreaction time. $(t_{1/2})$

Which one of the following is not aromatic?

$1$-Chlorobutane on reaction with alcoholic potash gives

Among the following, the compound that is readily soluble in water is

When $O_2$ is converted into $O_2^+$

Which one of the following is employed as Antihistamine?

Two aromatic compounds having formula $C_7H_8O$ which are easily identifiable by $FeCl_3$ solution test (violet colouration) are

Reaction of formaldehyde and ammonia gives

The amount of the heat released when $20\,mL$ $0.5\, M\, NaOH$ is mixed with $100\, mL\, 0.1\, M\, HCl$ is $x\, kJ$. The heat of neutralization is

Which of the following compounds has maximum volatility?

The ease of Nitration of the following three hydrocarbons follows the order

Which one of the following will show optical isomerism?

The ease of dehydrohalogenation of alkyl halide with alcoholic $KOH$ is

Among the alkenes which one produces tertiary butyl alcohol on acid hydration

If the molecular wt. of $Na_2S_2O_3$ and $I_2$ are $M_1$ and $M_2$ respectively, then what will be the equivalent wt. of $Na_2S_2O_3$ and $I_2$ in the following reaction? $\ce{2S2O^{2-}_3 + I2-> S4O^{2-}_6 + 2I-}$

p-toluidine and benzyl amine can be distinguished by

In producing chlorine through electrolysis $100\, W$ power at $125\, V$ is being consumed. How much chlorine per minute is leberated? ($ECE$ of chlorine is $0.367 ? 10^{-6}\, kg/C$)

In which of the following octahedral complexes of Co (At. no. 27), will the magnitude of $\Delta_{0}$ be the highest?

$Mn_2O_7$ dissolves in water to give an acid. The colour of the acid is

In a set of reactions acetic acid yielded a product D. $CH_{3} COOH {->[{SOCl_{2}}]} A {->[{\text{Benzene}}][{\text{anhy} AlCl_{3}}]} B {->[{HCN}]} C {->[{H_{2}O}]}$ The structure of D would be

In the reversible reaction, $2 NO _{2} \ce{->[{k_{1}}][{K_{2}}]} N _{2} O _{4}$ the rate of disappearance of $N O_{2}$ is equal to

Acidified $K_2Cr_2O_7 $ solution turns green when $Na_2SO_3 $ is added to it. This is due to the formation of

Which of the following will give Cannizzaro reaction?

Glycerine is used as a preservative for fruits and eatables because

Which one of the following statements is not true regarding $(+)$ lactose?