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प्रश्न
Write main differences between the properties of white phosphorus and red phosphorus.
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उत्तर
| Property | White Phosphorus | Red Phosphorus |
| Appearance and Smell: | It is a soft, waxy solid with a garlic-like smell. | It is a hard, crystalline solid without any smell. |
| Toxicity: | It is poisonous. | It is non-poisonous. |
| Solubility: | Insoluble in water but soluble in carbon disulphide. | Insoluble in both water and carbon disulphide. |
| Reactivity: | Undergoes spontaneous combustion in air. | Comparatively less reactive and stable in air. |
| Structure: | Exists as discrete P4 molecules in both solid and vapour states. | Exists as a polymeric chain of linked P4 tetrahedra. |
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| (i) | \[\ce{F2 > Cl2 > Br2 > I2}\] | Oxidising power. |
| (ii) | \[\ce{MI > MBr > MC1 > MF}\] | Ionic character of metal halide. |
| (iii) | \[\ce{F2 > Cl2 > Br2 > I2}\] | Bond dissociation enthalpy. |
| (iv) | \[\ce{HI < HBr < HCI < HF}\] | Hydrogen-halogen bond strength. |
Which of the following orders are correct as per the properties mentioned against each?
| (i) | \[\ce{As2O3 < SiO2 < P2O3 < SO2}\] | Acid strength. |
| (ii) | \[\ce{AsH3 < PH3 < NH3}\] | Enthalpy of vapourisation. |
| (iii) | \[\ce{S < O < Cl < F}\] | More negative electron gain enthalpy. |
| (iv) | \[\ce{H2O > H2S > H2Se > H2Te}\] | Thermal stability. |
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