The longest period in the modern periodic table is___________________?
A. 6th
B. 7th
C. 2nd and 3rd both
D. 5th
Submitted by :- Jamil Ahmed
Noble gases are named so because they are__________________?
A. less reactive
B. Zero group elements
C. Having completely filled valence shell
D. All
Submitted by :- Jamil Ahmed
Which element was not known when Mendeleev proposed his classification ?
A. Hydrogen
B. Sodium
C. Copper
D. Germanium
Submitted by :- Jamil Ahmed
The scientist who did not contribute in the construction of periodic table ?
A. Al-Razi
B. Moseley
C. Dobereiner
D. Democritus
Submitted by :- Jamil Ahmed
Among halogens the highest boiling point is of___________________?
A. Florine
B. Chlorine
C. Bromine
D. Iodine
Submitted by :- Jamil Ahmed
Halides in which halogen atoms act as a bridge between two atoms of the other element are called___________________?
A. Covalent halides
B. Electronegative halides
C. Polymeric halides
D. Polymeric hydrides
Submitted by :- Jamil Ahmed
Oxidation state of an atom represents____________________?
A. Number of electrons gained
B. Number of electrons lost
C. Apparent charge in compound
D. Its vacancies
Submitted by :- Jamil Ahmed
Metallic characters of alkali metals_____________________?
A. Increase down the group
B. Decrease down the group
C. No regular trend
D. Remain same
Submitted by :- Jamil Ahmed
Addition of 2nd electron to a uni negative ion is always____________________?
A. Exothermic
B. Endothermic
C. Data is insufficient
D. Unpredictable
Submitted by :- Jamil Ahmed
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
Submitted by :- Jamil Ahmed