781 Nitrates of which pair of elements give different products on thermal decomposition ? Chemistry Medium Full question → A Na K B Mg Ca C Li Na D Li Ca
782 Which element is necessary for normal leaf development ? Chemistry Medium Full question → A Si B Ba C Mg D Ca
783 The word Alkali means__________________? Chemistry Medium Full question → A Base B Basic salt C Ashes D Spirit
784 Which one is least ionic in nature and decompose on heating ? Chemistry Medium Full question → A LiOH B NaOH C KOH D CsOH
785 Which one is natron ? Chemistry Medium Full question → A Na2CO3 B Na2CO3.10H2O C Na2CO3.H2O D NaHCO3
786 Which ion will have maximum value of heat of hydration ? Chemistry Medium Full question → A A1+3 B Cs+ C Ba+ D Mg+2
787 Electrolysis of dilute solution of NaCl results at the anode_______________? Chemistry Medium Full question → A sodium B hydrogen C chlorine D oxygen
788 Carnalite has chemical formula__________________? Chemistry Medium Full question → A KCI B KCI.MgCl2.6H2O C Na2B4O7.10H2O D CaCO3.MgCO3
789 NaOH is named as caustic soda because________________? Chemistry Medium Full question → A It corrodes the organic tissues B It is used in soda water C It reacts with chlorine gas D It reacts with fats to form soap
790 First ionization potential of alkaline earth metal is greater than alkali metals because___________________? Chemistry Medium Full question → A They are more reactive B They have greater atomic radii C They have smaller atomic sizes D All
791 Alkali and alkaline earth metals impart colours when heated over burner. It is due to______________? Chemistry Medium Full question → A Smaller electronegativity of alkali metals B Smaller ionic radius of these metals C De-excitation of electrons from higher energy levels to low energy level D Excitation of electrons from low energy levels to higher energy levels
792 In diaphragm cell level of brine in anode compartment is kept slightly higher which prevents_______________? Chemistry Medium Full question → A Hydroxide ions to reach anode B Chlorine gas to mix C Cathode to decay D All of the above
793 The deliquescence is a property in which a solid____________________? Chemistry Medium Full question → A Absorbs moisture and remains solid B Absorbs moisture and turns to liquid form C Loses water of crystallization D Increases the number of water of crystallization
794 Which one of the following gives white precipitate with aqueous solution of BaCl2? Chemistry Medium Full question → A NaHCO3 B NaNO3 C Na2CO3 D Na2CrO4
795 Crystals of Na2CO3. 10H2O when exposed to air_________________? Chemistry Medium Full question → A Lose water and remain solid B Gain water and remain solid C Gain water and become liquid D Remains unchanged
796 Ammonia may be prepared by heating ammonium chloride with_______________? Chemistry Medium Full question → A Water B NaCl C Aqueous sodium hydroxide D H2SO4
797 Downs cell is used to prepare_________________? Chemistry Medium Full question → A Sodium carbonate B Sodium bicarbonate C Sodium metal D Sodium hydroxide
798 The element cesium bears resemblance with________________? Chemistry Medium Full question → A Ca B Cr C Both of the above D None of the above
799 Which one of the following is not an alkali metal ? Chemistry Medium Full question → A Francium B Caesium C Rubidium D Radium
800 Carbonates of lithium are not stable like that of sodium due to________________? Chemistry Medium Full question → A Low electronegativity B Low electropositivity C Low charge density D Not known yet