B. Sunita uses a lever of length 5m to lift a piece of stone weighing 1000N. If the distance of the load from the fulcrum is lm, how much effort does she
apply to lift the piece of stone?
[ Ans: 250N]

Phosphorous acid, h3po3(aq) , is a diprotic oxyacid that is an important compound in industry and agriculture. p k a1 p k a2 1.30 6.70 calculate the ph for each of the points in the titration of 50.0 ml of 1.5 m h3po3(aq) 1.5 m h 3 po 3 ( aq ) with 1.5 m koh(aq). 1.5 m koh ( aq ) .