901 All the elements in group VIA are ___________________ in nature? Chemistry Medium Full question → A hygroscopic B metals C polymeric D all of above
902 Phosphoric acid is a weak acid and its basicity is____________________? Chemistry Medium Full question → A 1 B 3 C zero D 2
903 P2O5 is a hygroscopic powder which sublimes at______________? Chemistry Medium Full question → A 260°C B 360°C C 630°C D 620°C
904 Phosphorous acid upon thermal decomposition yields phosphoric acid and____________________? Chemistry Medium Full question → A Phosphine B Phosphorus C Water D Phosphorus pentoxide
905 Acetic anhydride can be obtained by treating ethyl alcohol with___________________? Chemistry Medium Full question → A P2O5 B H2SO4 C Both A and B D PCI5
906 Allotropic form of phosphorus that is poisonous is___________________? Chemistry Medium Full question → A White B Red C Black D Violet
907 Phosphorus is a Greek word and it means_________________? Chemistry Medium Full question → A Light bearing B Fire C Impure D Tetrahedral
908 Which of the following will give phosphoric acid one reaction with water_________________? Chemistry Medium Full question → A PCI5 B P2O3 C P2O5 D All of the above
909 SO3 is not absorbed in water directly because__________________? Chemistry Medium Full question → A Reaction is exothermic B It is insoluble in water C Dilute acid is produced D All of above
910 Compounds of nitrogen and phosphorus are mostly________________? Chemistry Medium Full question → A ionic B covalent C polar D all varieties are possible
911 Which of the following is different with respect to physical appearance ? Chemistry Medium Full question → A Arsenic B Phosphorus C Antimony D Bismuth
912 Which element can form tripositive ion ? Chemistry Medium Full question → A Beryllium B Carbon C Silicon D Aluminium
913 Boric acid cannot be used__________________? Chemistry Medium Full question → A As antiseptic in medicine B For washing eyes C In soda bottles D For enamel and glazes
914 Identify the correct statement regarding CO_______________? Chemistry Medium Full question → A it combines with H2O to form carbonic acid B it reacts with red blood cells of haemoglobin C it is powerful oxidizing agent D it is used to prepare aerated drinks
915 CO2 is gas while SiO2 is solid at room temperature? Chemistry Medium Full question → A carbon is non-metal while silicon is semi-metal B CO2 is an independent molecule while SiO2 has network covalent structure C CO2 forms multiple bond while silicon does not form multiple bonds D Silicon has all sigma bonds
916 Which of the following is not a use of silicon ? Chemistry Medium Full question → A Lubricants B Hydraulic brakes C Antifreeze D Water repellent
917 Aqueous solution of borax above 62°C gives crystals of________________? Chemistry Medium Full question → A Na2B4O7.4H2O B Na2B4O7.5H2O C Na2B4O7.2H2O D Na2B4O7.10H2O
918 The process of aluminium extraction is called__________________? Chemistry Medium Full question → A Hall process B Thermite process C Haber process D Contact process
919 Which one of the following is not a semiconductor ? Chemistry Medium Full question → A Si B Ge C Se D Sn