681 Which of the following processes is used for the synthesis of cement ? Chemistry Medium Full question → A dry process B wet process C both D none
682 Deuterium reacts with oxygen to form________________? Chemistry Medium Full question → A Hard water B Heavy water C Soft water D Water gas
683 The property which increases upto group IV-A then decreases on wards_______________? Chemistry Medium Full question → A Ionization energy B Atomic radii C Melting & boiling points D Atomic volume
684 Which discovery caused a revision in the periodic law as stated by Mendeleev ? Chemistry Medium Full question → A Location of nucleus by Rutherford B Atomic number by Moseley C X-rays by Roentgen D Natural radioactivity by Henry Bacquerel.
685 Which one of the following is not a periodic property ? Chemistry Medium Full question → A Melting point of elements B Boiling point of elements C Ionization energy of elements D Coordination number of ions
686 In which of the following pairs are elements belonging to the same group ? Chemistry Medium Full question → A Boron & Beryllium B Nitrogen & Phosphorous C Magnesium & Aluminium D Gallium & Helium
687 Hydrogen resembles with carbon because of having________________? Chemistry Medium Full question → A Same number of electrons in the valence shell B Similar physical state C Remarkable reducing properties D Homovalent (show same valency)
688 Amphoteric exides are those which possess ____________ properties? Chemistry Medium Full question → A Acidic B Basic C Acidic and basic D Neutral and acidic
689 Modern periodic table has been divided in ___________ blocks? Chemistry Medium Full question → A 2 B 4 C 8 D 7
690 Seventh period contains _________________ normal elements ? Chemistry Medium Full question → A 2 B 4 C 6 D 8
691 The longest period in the modern periodic table is___________________? Chemistry Medium Full question → A 6th B 7th C 2nd and 3rd both D 5th
692 Noble gases are named so because they are__________________? Chemistry Medium Full question → A less reactive B Zero group elements C Having completely filled valence shell D All
693 Which element was not known when Mendeleev proposed his classification ? Chemistry Medium Full question → A Hydrogen B Sodium C Copper D Germanium
694 The scientist who did not contribute in the construction of periodic table ? Chemistry Medium Full question → A Al-Razi B Moseley C Dobereiner D Democritus
695 Among halogens the highest boiling point is of___________________? Chemistry Medium Full question → A Flrorine B Chlorine C Bromine D Iodine
696 Which of the following always increases on going from top to bottom in a group ? Chemistry Medium Full question → A Metallic character B Electronegativity C Oxidizing power D Tendency to get reduced
697 An element having low value of ionization energy and low value of electron affinity is likely to belong to__________________? Chemistry Medium Full question → A Group IA B Group IB C Group VIIA D Group VIII
698 Which of the following cannot exist in solution_________________? Chemistry Medium Full question → A O-2 B H+ C Cl- D Na+
699 Which one of the following element has highest oxidation state in its compounds ? Chemistry Medium Full question → A Cr B Mn C Sn D O
700 True increasing order of acidity of the oxides of Mn is_________________? Chemistry Medium Full question → A MnO < MnO2 < Mn2O7 B Mn2O7 > MnO2 > MnO C MnO2 > MnO > Mn2O7 D MnO2 > Mn2O7 > MnO