Question

2P + 5H${}_2$SO${}_4$(conc.) $\stackrel{\Delta }{\to }$ __________ + 2H${}_2$O + 5SO${}_2$

• A. 2H${}_3$PO${}_4$
• B. 2H${}_2$PO${}_3$
• C. 2H${}_2$SO${}_4$
• D. 2HPO${}_4$

Answer 1

The correct option is A 2H${}_3$PO${}_4$

Conc. sulphuric acid reacts with phosphorous to form phosphoric acid, water and sulphur dioxide gas.
$2P+5H_{2}S{O}_4\left(conc\right)\stackrel{\Delta }{\to }2H_{3}P{O}_4+2H_{2}O+5S{O}_2\uparrow$