Dry ice is :
Water
Solid carbon dioxide
Silica
Quartz
Group I elements are called:
Noble gases
Transition elements
Alkali metals
Halogens
Metallic bond is due to the presence of:
Cations
Anions
Mobile electrons
Atoms
Glass obtained by heating a mixture of sand, lime stone and sodium carbonate is:
Soda - lime glass
Boro silicate glass
Pyrex
Borax glass
The most stable arrangement of electrons is for :
Transition metals
The first systematic classification of elements was done by :
Einstein
Niels Bohr
Mendeleev
Moseley
In galvanization, the metal coated on iron is:
Zinc
Tin
Magnesium
Lead
Hot metal at high temperature is allowed to cool slowly, producing a large grain size. This process is called:
Tempering
Cooling
Quenching
Annealing
The structure of methane is:
Linear
Tetrahedral
Bend
Trigonal pyramid
The elements in the middle of the periodic table from group II to III are called: