Explanation
In HNO3 and N2O5, the oxidation state of N remains + 5.
B3N3 or BN resembles graphite in structure and is thus called inorganic graphite
In fullerene (C60) the type of hybridization involved is sp2
Liquid ammonia is liquefied ammonia gas under pressure while liquor ammonia is concentrated solution of NH3 gas in water and thus both are different.
Semi water gas is a mixture of CO, H2 and N2.
Ozone in gaseous state is pale blue, liquid state is dark blue and purple in solid state.
In Hoope’s process for the purification of Ai silicon and copper are added as impurities to molten alumina in order to make the melt heavier
Lead is not affected by dil. HCl in the cold because a protective coating of PbCl2 is formed on the lead surface.
Cryolite is used in the electrolytic extraction of aluminium to dissolve bauxite.
Carbon due to non-availability of vacant d-orbitals cannot accommodate electron pairs from Cl- ions and hence cannot expand its valence shell to form [CCl6]2- ion
The raw materials for the manufacture of flint glass are litharge (PbO), sand (SiO2) and K2CO3.
Ge is used as a semiconductor in transistors
Wood’s metal is an alloy of Bi (50%) + Pb (25%) + Sn (12.5%) + Cd (12.5%). It has m.p. 71oC (344 k) .
Thomas slag or phosphatic slag is a mixture of Ca3 (PO4)2 and CaSiO3
SiCl4 gets hydrolysed in moist air and gives white fumes which are used as a smoke screen in war fare
The phenomenon of occurrence of a substance in two or more crystalline structure is called polymorphism
PbO2 is not used as a pigment in paints.
SiO2 is acidic, whereas Al2O3, SnO2 and PbO2 are amphoteric oxides
CCl4 is not hydrolysed as carbon does not have vacant d- orbitals to accommodate lone pairs of electrons from water molecules.
Glass is a super cooled liquid
Si due to its semi conducting nature is used in solar cells
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