std 9 samajik vigyan paper solution 2021 December | STD9 SS SECOND UNIT TEST PAPER SOLUTION 2021 |

An amino acid reacts with 10ml 0.05MNaOH and the final solution has pH=2.30 When 20ml of these base is added in the resulting solution.The pH become 9.7 .Identify the amino acid and calculate the isoelectric point of the amino acid.This amino acid is prepared by the reaction of compound (X) with NH_(3) and further hydrolysis with HCN compound (X) is less C atom containing compound that gives postitive iodoform test and positive Fehling's solution test. Amino acid is:

An amino acid reacts with 10ml 0.05MNaOH and the final solution has pH=2.30 When 20ml of these base is added in the resulting solution.The pH become 9.7 .Identify the amino acid and calculate the isoelectric point of the amino acid.This amino acid is prepared by the reaction of compound (X) with NH_(3) and further hydrolysis with HCN compound (X) is less C atom containing compound that gives postitive iodoform test and positive Fehling's solution test. Compound (X) is:

An amino acid reacts with 10ml 0.05MNaOH and the final solution has pH=2.30 When 20ml of these base is added in the resulting solution.The pH become 9.7 .Identify the amino acid and calculate the isoelectric point of the amino acid.This amino acid is prepared by the reaction of compound (X) with NH_(3) and further hydrolysis with HCN compound (X) is less C atom containing compound that gives postitive iodoform test and positive Fehling's solution test. Isoelectric point of the amino acid is:

A student mixed equal volumes of hydrochloric acid and sodium hydroxide solution of same concenterations in a beaker and tested the pH of the resulting mixture with a pH paper. What will be the colour of pH paper in this case?

A student took a sodium salt and dissolved it in water. When this aqueous sodium salt solution was terted with universal indicator paper, its pH was found to be 9. (a) What does pH 9 tell us about the sodium salt solution. (b) Name one sodium salt which can produce such a solution.

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: