12th biology sample paper weekly test with solution #pseb _ GAURAV CROOKS +2

11th class English model paper solution

Find the solutions of x^(2)+x-12 = 0

Aniline behaves as a weak base. When 0.1M ,50mL solution sample of aniline was mixed with 0.2 M ,12.5mL of solution of HCl ,the pH of resulting solution was 8 .Then pH of 0.01 M solution of anillinium chloride is :

A salt, when warmed with zinc powder and an NaOH solution, gives a gas that turns a filter paper soaked with an alkaline solution of K_(2)[HgI_(4)] brown. The salt responds to the brown ring test when acetic acid is used in place of sulphuric acid. The anion present in the salt is:

Consider the following experiments and answer the questions at the end of it (A) When Fe(CN)_(2) solution is treated with KCN solution species formed no longer gives tests of Fe^(2+) and CN^(Θ) (B) When K_(2)SO_(4) solution is treated with A1_(2)(SO_(4))_(3) solution species formed gives tests of K^(o+),A1^(3+) and SO_(4)^(2-) Species formed in experiment A does not give test of Fe^(2+) and CN^(Θ) it is due to formation of .

Can filter paper dipped in silver nitrate solution instead of lead acetate paper be used for testing a sulphide?

The aqueous solution of potassium cyanide is mixed with aqueous solution of F_e(CN)_2 . The resulting solution will give test for

There are three samples of H_(2)O_(2) labelled as 10 vol,15 vol,20 vol . Half liter of each sample are mixed and then diluted with equal volume of water. Calculate the volume strength of resultant solution.

A sample containing HAsO_2 (mol. mass =108 ) and weighing 3.78g is dissolved and diluted to 250mL in a volumetric flask. A 50mL sample (aliquat) is withdrawn with a pipet and titrated with 35mL of 0.05 M solution of I_2 . Calculate the percentage HAsO_2 in the sample :

What are the solutions to 3x^(2) + 12x + 6=0 ?