List of top Chemistry Questions

In which of the following compounds the oxidation number of carbon is not zero?

In which of the following acids oxidation state of sulphur is different from that of the others ?

In which allotropic form of sulphur, puckered $S_8$ rings are not present ?

In vulcanisation of rubber

In the structure of diborane

In the sphalerite (ZnS) structure, $S^{2-}$ ions form a face-centred cubic lattice. Then from the Comers, $Zn^{2+}$ ions are present on the body diagonals at

In the reaction,$Cu(s)+ 2Ag^+ (aq) \rightarrow Cu^{2+}(aq) + 2Ag(s)$, the reduction half cell reaction is

In the reaction of excess of $ {LiAlH_4}$ with crotonaldehyde

In the reaction, $ {H_2O_2 + Na_2 CO_3 -> Na_2O_2 + CO_2 + H_2O}$ the substance undergoing oxidation is

In the reaction, $ {3Cl_2 + 6 NaOH -> NaClO_3 + 5 NaCl + 3 H_2O }$ the element which loses as well as gains electrons is

In the reaction between $ {SO_2}$ and $ {O_3}$, the equivalent weight of ozone is

In the reaction : $Cl_2 + OH^- \to Cl^- + ClO_4 + H_2O$

In the reaction $ {2 Na_2S_2O_3 + I_2 -> Na_2 S_4 O_6 + NaI}$ the oxidation number of sulphur is

In the preparation of ethyl chloride by Grooves?>[Anhyd.ZnCl_2] CH_2CH_2Cl + H_2O}$ the main reason for using anhydrous $ {ZnCl_2}$ as catalyst is that

In the presence of oxygen, removal of sulphur from the ore is done in

In the preparation of compounds of $Xe$, Bartlett had taken $O^+_2\, PtF_6^-$ as a base compound. This is because

In the periodic table, the maximum chemical reactivity is at the extreme left (alkali metals) and extreme right (halogens). Which properties of these two groups are responsible for this?

In the metallic crystal

In the manufacture of safety matches we use

In the given reaction : $ {CH3CH2OH ->[KMnO_4][H^+] A }$$ { ->[B][H_2SO_4 /heat] CH3COOCH2CH3}$ A and B are

In the given graph, a periodic property $(R)$ is plotted against atomic numbers $(Z)$ of the elements. Which property is shown in the graph and how it is correlated with reactivity of the elements?

In the Frasch process, molten sulphur rises up from the

In the following sets of reactants which two sets best exhibit the amphoteric characters of $ {Al_2O_3. xH_2O}$ ? Set 1: $ {Al2O3.xH2O (s)}$ and $ {OH- (aq)}$ Set 2: $ {Al2O3.xH2O (s)}$ and $ {H2O (l)}$ Set 3: $ {Al2O3.xH2O (s)}$ and $ {H+ (aq)}$ Set 4: $ {Al2O3.xH2O (s)}$ and $ {NH3 (aq)}$

In the following reaction : $ {Acetamide ->[P_2O_5][\Delta] Y ->[H_2O/HCl][\Delta] Z ->[NaOH][CaO] CH_4 }$, identify Z :

In the following reaction, $C_6H_5COOCH_3\xrightarrow[H_2O/H^+]{LiAlH_4}A+B$ A and Bare respectively