2024 JUPEB CHEMISTRY: (4226)

*JUPEB CHEMISTRY* 

(6a)

(i)Both lithium and magnesium are harder lighter than other elements in the respective groups.

(ii)Lithium and magnesium react slowly with water. Their oxides and hydroxides are much less soluble and their hydroxides decompose on heating.

(iii)The oxides, Li2O and MgO do not combine with excess oxygen to give any superoxide.

(iv)The carbonates of lithium and magnetism decompose easily on heating to form the oxides and CO2 .

(v)Both LiCl and MgCl2 are soluble in ethanol.

(vi) Both LiCl and MgCl2 are deliquescent and crystallize from aqueous solution as hydrates, LiCl.2H2O and MgCl2.8H2O

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(5a)

*Diamond*

i. It occurs naturally in free state

ii. It is the hardest natural substance known

iii. It has high relative density 3.5

iv. It is transparent refractive index (2.45)

v. It is non-conductor of heat and electricity

vi. It burns in air at 900°C

vii. It occurs as octahedral crystals

viii. It is insoluble in all solvents

*TABULATE!!!!!!!!!*

*Graphite*

i. It occurs naturally and is manufactured artificially

ii. It is soft and greasy to touch

iii. Its relative density is 2.3

iv. It is black in colour and opaque

v. Graphite is a good conductor of heat and electricity

vi. It burns in air at 700-800°C

vii. It occurs as hexagonal crystals

viii. It is insoluble in all ordinary solvents

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4c.

Solubility product is defined as the maximum product of the ionic concentrations or activities of an electrolyte that at one temperature can co

ntinue in equilibrium with the undissolved phase.

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