Solutions lecture 2

A solution of H_(2)O_(2) labelled as '20 V' was left open. Due to this some, H_(2)O_(2) decomposed and volume strength of the solution decreased . To determine the new volume strength of the H_(2)O_(2) solution, 10 mL of the solution was taken and it was diluted to 100 mL . 10 mL of this diluted solution was titrated against 25 mL of 0.0245 M KMnO_(4) solution under acidic condition. Calculate the volume strength of the H_(2)O_(2) solution .

To a 25 mL H_(2)O_(2) solution excess of an acidified solution of potassium iodide was added. The iodine liberated required 20 mL of 0.3 N sodium thiosulphate solution Calculate the volume strength of H_(2)O_(2) solution.

There are 3 doors to a lecture room. In how many ways can lecturer enter and leave the room ?

There are 3 doors to a lecture room. In how many ways can lecturer enter the room from one door and leave from another door?

There are 5 doors to a lecture room. Two are red and the others are green. In how many ways can a lecturer enter the room and leave the room from different colored doors?

A fresh H_(2)O_(2) solution is labelled 11.2V . This solution has the same concentration as a solution which is

In a biology lecture, the teacher was dictating the organelles of a cell as endoplasmic reticulum, mitochondria, nucleus, ribosome, centriole and centrosome. Which cell was she referring to?

Addition of solution of oxalate to an aqueous solution of mixture of Ba^(2+), Sr^(2+) and Ca^(2+) will precipitate :

When H_(2)S is passed through acidified K_(2)Cr_(2)O_(7) solution, the solution turns :

500 ml of 2M NaCl solution was mixed with 200 ml of 2 M NaCl solution. Calculate the molarity of NaCl in final solution