Std 12 Gujarati Paper Solution 07-04-2022 | Gseb Paper Solution Gujarati First Language 07 April 22

You have four solutions A, B, C and D. The pH of solution A is 6, B is 9, C is 12 and D is 7. (a) Identify the most acidic and most basic solutions. (b) Arrange the above four solutions in the increasing order of H^+ ion concentration. (c) State the change in colour of pH paper on dipping in solution C and D.

(i) Explain why is hydrochloric acid a strong acid and acetic acid, a weak acid ? How can it be verfied ? (ii) Explain why equeous solution of an acid conducts electricity. (iii) You have four solutions A, B,C and D. The pH of solution A is 6, B is 9, C is 12 and D is 7. (a) Identify rhe most acidic and most basic solutions. (b) Arrange the above four solutions in the increasing order of H^(+) ion concentration. (c ) State the change in colour of pH paper on dipping in solution C and d.

A blue litmus paper was first dipped in dil, HCl and then in dil. NaOH solution. It was observed that the color of litmus paper changed to red changed first to red and then to blue changed blue to pink changed blue to yellow

A study was conduced to find out the concentration of sulphur dioxide in the air in parts per million (ppm) of a certain city. The data obtained for 30 days is as follow: {:("0.03 0.08 0.08 0.09 0.04 0.17"),("0.16 0.05 0.02 0.06 0.18 0.20"),("0.11 0.08 0.12 0.13 0.22 0.07"),("0.08 0.01 0.10 0.06 0.09 0.18"),("0.11 0.07 0.05 0.07 0.01 0.04"):} You were asked to prepare a frequency distribution table, regarding the concentration of sulphur dioxide in the air in parts per million of a certain city for 30 days. Using this table, find the probability of the concentration of sulphur dioxide in the interval 0.12-0.16 on any of these days.

A mixture of three gases A,B and C is passed first into acidified K_(2)Cr_(2)O_(7) solution when A is absorbed turning the solution green. The remainder of the gas is passed through excess of lime water which truns milky resulting in the absorption of B. The residual gas C is absorbed by alkaline pyrogallol solution. However the original mixture does not run lead acetate paper black. Identify A,B, & C ( Give necessary equations ).

Given : 1 L, 2M solution of C_(12)H_(22)O_(11) under go first order reaction. C_(12)H_(22)O_(11)+H_(2)Orarr C_(6)H_(12)O_(6)+C_(6)H_(12)O_(6) {:(,"Angle of rotation ",theta,20^(@),-10^(@),-40^(@)),(,"Time",t("min"),0,10,oo):} If osmotic pressure of solution is pi atm at (300)/(0.821)K temperature after 10 min then calculate the value of (pi)/(10) ?