Phosphorus and Its Compounds
Chemistry ⇒ Chemistry of Non-metals and Their Compounds
Phosphorus and Its Compounds starts at 10 and continues till grade 12.
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A sample of phosphorus trichloride (PCl3) is hydrolyzed to produce phosphorous acid (H3PO3) and hydrochloric acid (HCl). Write the balanced chemical equation for this reaction. If 137 g of PCl3 is completely hydrolyzed, calculate the mass of HCl produced. (Atomic masses: P = 31 u, Cl = 35.5 u, H = 1 u, O = 16 u)
Explain, with equations, how phosphorus can be converted from its white allotrope to phosphoric acid, mentioning all intermediate compounds and reactions involved. Also, calculate the total number of moles of water required to convert 1 mole of white phosphorus to phosphoric acid.
Phosphoric acid (H3PO4) is prepared by the reaction of phosphorus pentoxide with water. Write the balanced chemical equation for this reaction. If 71 g of phosphorus pentoxide is reacted with excess water, calculate the number of moles and mass of phosphoric acid formed. (Atomic masses: P = 31 u, O = 16 u, H = 1 u)
Phosphorus trichloride (PCl3) is prepared by the reaction of white phosphorus with chlorine gas. Write the balanced chemical equation for this reaction. If 3.1 g of phosphorus reacts with excess chlorine, calculate the volume of chlorine gas (at STP) required for the complete reaction. (Atomic masses: P = 31 u, Cl = 35.5 u; 1 mole of gas at STP = 22.4 L)
White phosphorus reacts with oxygen to form phosphorus pentoxide (P4O10). Write the balanced chemical equation for this reaction. If 6.2 g of white phosphorus is completely burnt in excess oxygen, calculate the mass of phosphorus pentoxide formed. (Atomic masses: P = 31 u, O = 16 u)
Compare the chemical properties of white and red phosphorus with respect to their reaction with oxygen.
Describe the laboratory preparation of phosphine (PH3) and mention one of its uses.
Describe the physical properties of white phosphorus and explain why it must be stored under water.
Describe the structure and properties of phosphorus pentachloride (PCl5).
Discuss the environmental impact of excessive use of phosphate fertilizers.
Explain the difference between red phosphorus and white phosphorus in terms of their structure and reactivity.
Explain the role of phosphorus in the phosphorus cycle in nature.
Explain why phosphorus is essential for living organisms.
Why is white phosphorus more toxic than red phosphorus? Explain with reference to their chemical nature.
Write a short note on the uses of phosphorus and its compounds in daily life.
