791. The atoms of the same element having the same atomic number but different mass number are called __.
A. Isobars
B. Isomers
C. Isotopes
D. Isotropes
792. Deuterium reacts with oxygen to form __.
A. Hard Water
B. Soft Water
C. Heavy Water
D. Water Gas
793. Ionization energy depends upon_________.
A. Nuclear charge
B. Shielding effect
C. Atomic Size
D. I.E. depends upon all of the above and nature of Orbital
794. Higher value of electron affinity means_______.
A. Atom will lose an electron easily
B. Atom will gain an electron easily
C. Atom may form a di-positive ion
D. The reason is unknown
795. Oxidation state of an atom represents __.
A. Number of electrons gained
B. Number of electrons lost
C. Apparent charge in a compound
D. Its vacancies
796. Noble gases are named so because they are __.
A. Inert
B. Zero-group element
C. Having a completely filled valence shell
D. All
797. Mart the correct statement __.
A. The NA+ atom is smaller than the NA
B. NA+ is larger than NA atom
C. CL- is smaller than CI atom
D. CI- ( ions are equal in size )
798. Inner transition elements are called __.
A. Lanthanides
B. Actinides
C. Rare earth metals
D. All
799. Mark the correct statement __.
A. all halogens are present during the same time period
B. all alkali metals are present in the same period
C. all noble gases are present in the same period
D. all lanthanides are present in the same group
800. Ozone is present in which layer of the atmosphere?
(A) Troposphere
(B) Thermosphere
C. Troposphere and Stratosphere
(D) Mesosphere
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