A translucent white waxy solid (a) on heating in an inert atmosphere is converted to its allotropic form (b). allotrope (a) on reaction with very dilute aqueous koh liberates a highly poisonous gas (c) having rotten fish smell. with excess of chlorine forms (d) which hydrolyses to compound (e). identify compounds (a) to (e) .
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1. Solid A is white phosphorous, P4. Many allotropic forms of phosphorous exist and white phosphorous is a waxy solid. It is highly reactive and unstable compound.
2. On heating at 573K in an inert atmosphere for several days, the white phosphorous converts into red phosphorous (B).
3. White phosphorous on heating with alkali’s like KOH in an inert atmosphere of CO2 forms phosphine gas, PH3 and potassium hypophosphite. Phosphine gas is a colourless gas with a rotten fish smell and is highly poisonous gas. This is compound C.
P4 + 3KOH + 3H2O → PH3 + 3KH2PO2
White phosphorous reacts with excess of dry chlorine to form phosphorous pentachloride, PCl5(D)
P4 + 10Cl2 → 4PCl5
Phosphorous pentachloride is hydrolysed by moist air to form POCl3 which reacts further with water to form phosphoric acid, H3PO4 (E).
PCl5 + H2O → POCl3 + 2HCl
POCl3 + H2O → H3PO4 + 3HCl
2. On heating at 573K in an inert atmosphere for several days, the white phosphorous converts into red phosphorous (B).
3. White phosphorous on heating with alkali’s like KOH in an inert atmosphere of CO2 forms phosphine gas, PH3 and potassium hypophosphite. Phosphine gas is a colourless gas with a rotten fish smell and is highly poisonous gas. This is compound C.
P4 + 3KOH + 3H2O → PH3 + 3KH2PO2
White phosphorous reacts with excess of dry chlorine to form phosphorous pentachloride, PCl5(D)
P4 + 10Cl2 → 4PCl5
Phosphorous pentachloride is hydrolysed by moist air to form POCl3 which reacts further with water to form phosphoric acid, H3PO4 (E).
PCl5 + H2O → POCl3 + 2HCl
POCl3 + H2O → H3PO4 + 3HCl
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1. Solid A is white phosphorous, P4. Many allotropic forms of phosphorous exist and white phosphorous is a waxy solid. It is highly reactive and unstable compound.
2. On heating at 573K in an inert atmosphere for several days, the white phosphorous converts into red phosphorous (B).
3. White phosphorous on heating with alkali’s like KOH in an inert atmosphere of CO2 forms phosphine gas, PH3 and potassium hypophosphite. Phosphine gas is a colourless gas with a rotten fish smell and is highly poisonous gas. This is compound C.
P4 + 3KOH + 3H2O → PH3 + 3KH2PO2
White phosphorous reacts with excess of dry chlorine to form phosphorous pentachloride, PCl5(D)
P4 + 10Cl2 → 4PCl5
Phosphorous pentachloride is hydrolysed by moist air to form POCl3 which reacts further with water to form phosphoric acid, H3PO4 (E).
PCl5 + H2O → POCl3 + 2HCl
POCl3 + H2O → H3PO4 + 3HCl
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2. On heating at 573K in an inert atmosphere for several days, the white phosphorous converts into red phosphorous (B).
3. White phosphorous on heating with alkali’s like KOH in an inert atmosphere of CO2 forms phosphine gas, PH3 and potassium hypophosphite. Phosphine gas is a colourless gas with a rotten fish smell and is highly poisonous gas. This is compound C.
P4 + 3KOH + 3H2O → PH3 + 3KH2PO2
White phosphorous reacts with excess of dry chlorine to form phosphorous pentachloride, PCl5(D)
P4 + 10Cl2 → 4PCl5
Phosphorous pentachloride is hydrolysed by moist air to form POCl3 which reacts further with water to form phosphoric acid, H3PO4 (E).
PCl5 + H2O → POCl3 + 2HCl
POCl3 + H2O → H3PO4 + 3HCl
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