921 Which of the following shows inert pair effect ? Chemistry Medium Full question → A boron B carbon C silicon D tin
922 The metal which is used in thermite process because of its activity is____________________? Chemistry Medium Full question → A iron B copper C aluminium D zinc
923 Which of the following does not give Borax bead test ? Chemistry Medium Full question → A Cu B Cr C Ni D A1
924 Substance which is found in dried up lakes of Tibet and California is_______________? Chemistry Medium Full question → A Tincal B Boric acid C Calcium carbonate D Colemanite
925 Boron in soil has been considered micronutrient for_________________? Chemistry Medium Full question → A Soil porocity B Proper growth of plants C Alkalinity of soil D All
926 Which of the following is metasilicic acid ? Chemistry Medium Full question → A H2SnO3 B H2SiO3 C H3AsO4 D H3SbO4
927 Which of the following will decompose to produce litharge_________________? Chemistry Medium Full question → A Pb2O B Pb3O4 C PbO2 D All of the above
928 If temperature of gallium arsenide is increased then its conductivity will___________________? Chemistry Medium Full question → A decrease B increase C remains constant D first decreases then increases
929 The coloured glassy mass in borax bead test is due to the formation of___________________? Chemistry Medium Full question → A metal borate B metal meta borate C metal boride D metal silicate
930 Boron is non metal while other elements of IIIA group are metals. This is because______________? Chemistry Medium Full question → A it has small size B it has high nuclear charge C it forms molecular addition compounds D all of the above
931 Silicon differ from silica by a group of__________________? Chemistry Medium Full question → A Ch3 B OH C OCH3 D O2
932 Soda lime is a mixture of____________________? Chemistry Medium Full question → A CaO and KOH B CaO and NaOH C NaOH and Na2O D Na2O and KOH
933 Clemmensens reduction infolves the reduction of___________________? Chemistry Medium Full question → A ketone B aldehyde C alkane D all of the above
934 Sabatier Senderns reaction involve _____________ in presence of Ni? Chemistry Medium Full question → A Aalkene & H2 B alkene & O2 C alkene & N2 D alkyne & Cl2
935 When one hydrogen atom of alkane is removed then it is called________________? Chemistry Medium Full question → A alkene B alkyl C aldehyde D saturated hydrocarbon
936 Which is methyl cyanide_________________? Chemistry Medium Full question → A CH3NH2 B CH3NO2 C CH3CN D CH2 = CH – CN
937 Preparation of vegetable ghee involves_________________? Chemistry Medium Full question → A halogenation B hydroxylation C hydrogenation D hydration
938 Which is used for artificial ripening of fruit ? Chemistry Medium Full question → A ethane B ethene C ethyne D methane
939 Which one is Chloroform_________________? Chemistry Medium Full question → A CH2Cl2 B CH3Cl C CHCl3 D CCl4
940 In unsaturated hydrocarbons electrons favour___________________? Chemistry Medium Full question → A less reactivity B addition reactions C substitution reactions D none