List of top Chemistry Questions

How many '$mL$' of perhydrol is required to produce sufficient oxygen which can be used to completely convert $2L$ of $SO_2$ gas to $SO_3$ gas?

In Gattermann reaction, a diazonium group is replaced by using $\underline{Y} \underline{X}$and $\underline{Y}$ are

pH of a buffer solution decreases by $0.02 \,$ units when $0.12\, g$ of acetic acid is added to $250\, mL$ of a buffer solution of acetic acid and potassium acetate at $ 27^{\circ}C$. The buffer capacity of the solution is

Which one of the following order is correct for the first ionisation energies of the elements?

A compound has four $ sp^{3}$ hybridized covalent bonds. Its shape is

The $ 'd' $ orbital involved in the hybridisation in the $ PCl_{5} $ molecule is

The term quaternary structure is used in the context of

Which of the following is correct?

Which one of the following statements is not correct?

The atom of smallest atomic radius among the following is

For the reaction $N _{2}( g )+ O _{2}( g ) \rightleftharpoons 2 NO ( g )$ the equilibrium constant is $K _{1}$. The equilibrium constant is $K _{2}$ for the reaction $2 NO ( g )+ O _{2}( g ) \rightleftharpoons 2 NO _{2}( g ) .$ What is $K$ for the reaction $NO _{2}( g ) \rightleftharpoons 1 / 2 N _{2}( g )+ O _{2}( g ) ?$

The percentage (by weight) of sodium hydroxide in a $ 1.25 $ molal $ NaOH $ solution is

In an oxidation-reduction reaction, $MnO _{4}^{-}$ion is converted to $Mn ^{2+}$. What is the number of equivalents of $KMnO _{4}$ (mol. wt. $=158$ ) present in $250\, mL$ of $0.04\, M\, KMnO _{4}$ solution ?

Ethyl butyrate has the flavour of which fruit ?

The $ IUPAC $ name of crotonaldehyde is

The ionisation constant of ammonium hydroxide is $ 1.77 \times 10^{-5} $ at $298\, K.$ Hydrolysis constant of ammonium chloride is

Which alcohol of molecular formula $ C_4H_9OH $ cannot be obtained by the reduction of carbonyl compound ?

Cannizaro?s reaction is not given by

The ionization energy of the electron in the hydrogen atom in its ground state is $13.6\, eV.$ The atoms are excited to higher energy levels to emit radiations of $6$ wavelengths. Maximum wavelength of emitted radiation corresponds to the transition between

Stachyose is a

Polyethylene glycol method is used for

Steps taken by the Government of India to control air pollution include

The number of photo electrons emitted for light of a frequency $\upsilon$ (higher than the threshold frequency $v_0) $ is proportional to

Among the following which is the strongest oxidising agent?

The half-life of a radioactive element is 10 hours. How much will be left after 4 hours in 1 g atom sample?