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Hydronium ions, X- ions and a large number of undissociated molecules of HX
Chlorine gas is formed with MnO2.
Chlorine gas not formed with CuO
Coordinate covalent bonding
Solid lead bromide contains strong electrostatic force of attraction between ions, and hence contain no free ions for conduction of electricity.
C12H22O11 + nH2SO4 - - - - 12C + 11H2O + nH2SO4
It generally does not liberate hydrogen gas on reaction with metals.
Because they have high calorific value. The reaction is exothermic. They are easily combustible.
Because atomic radius decreases and effective nuclear charge increases across a period.