861 Which one of the following methods will not give benzene ? Chemistry Medium Full question → A Heating sod. Salt of Benzoic acid with soda lime B Distilling phenol with Zn dust C Chlorobenzene with NaOH at 360°C & 150atm. D Hydrolysis of benzene sulphonic acid with super heated steam
862 What catalyst is employed when benzene is prepared from acetylene at 70°C? Chemistry Medium Full question → A Cr2O3 + A2O3 + SiO2 B Raney nickel C Organo-nickel D Ni 250 – 300°C
863 The resonance energy of benzene is__________________? Chemistry Medium Full question → A 150.5 kJ/mol B 250.5 kJ/mol C 150.5 Cal/mol D 250.5 Cal/mol
864 How many moles of H2 are added up when benzene is heated with hydrogen in the presence of platinum ? Chemistry Medium Full question → A Two B Three C Four D Six
865 Michael Faraday discovered benzene in the gas which was produced by destructive distillation of vegetable oil that is done in________________? Chemistry Medium Full question → A The presence of Oxygen B The presence of Hydrogen C The absence of Oxygen D The presence of excessive Oxygen
866 When benzene is substituted by halogens only which one of the following halogens only which one of the following halogens is given the number one position in the ring while writing the name of compound ? Chemistry Medium Full question → A Bromine B Chlorine C Fluorine D Iodine
867 How many electrons are there in benzene to form delocalized electron cloud________________? Chemistry Medium Full question → A 3 B 4 C 6 D 8
868 Phenanthrene is a fused polycyclic compound contains __________ benzene rings ? Chemistry Medium Full question → A Two B Three C Four D Five
869 Addition of 2% gypsum in cement________________? Chemistry Medium Full question → A Triggers hydration B Triggers hydrolysis C Prevents rapid hardening D all of the above
871 Second ionization potential of alkali metals are very high due to_______________? Chemistry Medium Full question → A being s-block elements B inert gas configurations C ns1 electronic configuration D being metals
872 Magnesium metal does not burn in the vessel containing_______________? Chemistry Medium Full question → A N2 B O2 C N2 and O2 D Ne
873 Sodium is not observed in +2 oxidation state because of its__________________? Chemistry Medium Full question → A high first ionization potential B high second ioniation potential C high ionic radius D high electronegativity
874 Which one of the following pairs shown diagonal relationship in the periodic table ? Chemistry Medium Full question → A Sodium and Lithium B Lithium and magnesium C Lithium and beryllium D Boron and Beryllium
875 Which one of the following alkali metals forms only normal oxide when it reacts with O2 ? Chemistry Medium Full question → A Lithium B Sodium C Potassium D Rubidium
876 Gypsum is applied to the soil as a source of________________? Chemistry Medium Full question → A Ca and P B S and P C Ca and S D we could not apply
877 In diaphragm cell hydrogen is discharged by the reduction of__________________? Chemistry Medium Full question → A Water B HCI C Na+ D NaCl
878 Which one of the following carbonate is water insoluble ? Chemistry Medium Full question → A Na2CO3 B K2CO3 C (NH4)2CO3 D CaCO3
879 Which one of the following substances conducts electricity by the movement of ions ? Chemistry Medium Full question → A Graphite B Copper C Molten sodium chloride D Mercury
880 The ore CaSO4.H2O has the general name_______________? Chemistry Medium Full question → A Gypsum B Dolomite C Calcite D Plaster of Paris