Which one of the following element has highest oxidation state in its compounds ?
(A) Cr
(B) Mn
(C) Sn
(D) O
True increasing order of acidity of the oxides of Mn is_________________?
(A) MnO < MnO2 < Mn2O7
(B) Mn2O7 > MnO2 > MnO
(C) MnO2 > MnO > Mn2O7
(D) MnO2 > Mn2O7 > MnO
Ionization energy depends upon____________________?
(A) Nuclear charge
(B) Atomic size
(C) Shielding effect
(D) I.E depends upon all of the above and nature of orbital
Deuterium reacts with oxygen to form________________?
(A) Hard water
(B) Heavy water
(C) Soft water
(D) Water gas
The property which increases upto group IV-A then decreases on wards_______________?
(A) Ionization energy
(B) Atomic radii
(C) Melting & boiling points
(D) Atomic volume
Which discovery caused a revision in the periodic law as stated by Mendeleev ?
(A) Location of nucleus by Rutherford
(B) Atomic number by Moseley
(C) X-rays by Roentgen
(D) Natural radioactivity by Henry Bacquerel.
Which one of the following is not a periodic property ?
(A) Melting point of elements
(B) Boiling point of elements
(C) Ionization energy of elements
(D) Coordination number of ions
In which of the following pairs are elements belonging to the same group ?
(A) Boron & Beryllium
(B) Nitrogen & Phosphorous
(C) Magnesium & Aluminium
(D) Gallium & Helium
Hydrogen resembles with carbon because of having________________?
(A) Same number of electrons in the valence shell
(B) Similar physical state
(C) Remarkable reducing properties
(D) Homovalent (show same valency)
Amphoteric exides are those which possess ____________ properties?
(A) Acidic
(B) Basic
(C) Acidic and basic
(D) Neutral and acidic