1. (2023高一下·资溪期末) 某小组利用硫代硫酸钠溶液与稀硫酸反应：Na₂S₂O₃+H₂SO₄=Na₂SO₄+S↓+SO₂↑+H₂O，探究反应条件对速率的影响，下列有关说法正确的是（  ）                                                                                                                                                                                                                                                                                                   

选项	反应温度/℃	Na2S2O3溶液		稀H2SO4		H2O
		V/mL	c/(mol/L)	V/mL	c/(mol/L)	V/mL
①	25	10	0.1	10	0.1	0
②	25	5	0.1	10	0.1	X
③	50	10	0.1	5	0.2	5