List of top Chemistry Questions

Two different electrolytic cells filled with molten $Cu(NO_3)_2$ and molten $Al(N0_3)_3$ respectively are connected in series. When electricity is passed 2. 7 g Al is deposited on electrode. Calculate the weight of Cu deposited on cathode. $[Cu = 63 .5; Al= 27 .0 g mol^{-1} ]$

The correct order of increasing bond length of $ C - H, C - O, C - C$ and $ C = C $ is

Enthalpy change for the reaction, $4 H _{( g )} \rightarrow 2 H _{2( g )}$ is $-869.6\, kJ$ The dissociation energy of $H - H$ bond is

The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description ?

Ammonia gas does not evolve from the complex $FeCl_3$ $\cdot$ $4NH_3$ but it gives white precipitate with aqueous solution of $AgNO_3.$ Coordination number of central metal ion in the above complex is six. Give IUPAC name of the complex.

How glucose is related with fructose?

Give IUPAC name of the product, when acetamide is heated with anhydrous phosphorus pentoxide

How can you say that glucose is cyclic compound?

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. $(t_{1/2})$

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

Which one of the following is not aromatic?

$1$-Chlorobutane on reaction with alcoholic potash gives

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?

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

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

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? $\ce{2S2O^{2-}_3 + I2-> S4O^{2-}_6 + 2I-}$

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

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