PUC Science 2nd PUC Class 12 - Karnataka Board PUC Question Bank Solutions for Chemistry

Write the chemical equations involved when aniline is treated with the following reagents:

Br₂ water

Amino acids show amphoteric behaviour. Why?

Complete the following equations : 2 MnO₂ + 4 KOH + O₂ →

Complete the following equations : 2 Na₂CrO₄ + 2 H ⁺ →​

An element with density 2.8 g cm^–3 forms a f.c.c. unit cell with edge length 4 x 10^–8 cm. Calculate the molar mass of the element.

(Given : N_A = 6.022 x 10²³ mol ^–1)

Explain the principle of the method of electrolytic refining of metals. Give one example.

Complete the following equations:Cr₂O₇^2- + 2OH^- →

Complete the following equations : MnO₄- + 4H⁺ + 3e^- →

Complete the following equation : MnO₄^- + 8H⁺ + 5e^- →

Describe the roles of the following: NaCN in froth floatation process

Write the structure of 2-hydroxybenzoic acid.

Define the following term:

Essential amino acids

Complete the following chemical equation

Cr₂O₇^2- + 3Sn²⁺ + 14H⁺ →

Silver crystallises in fcc lattice. If edge length of the cell is 4.07 × 10⁻⁸ cm and density is 10.5 g cm⁻³, calculate the atomic mass of silver.

Predict the product of electrolysis in the following:

An aqueous solution of AgNO₃ with silver electrodes.

Predict the product of electrolysis in the following:

An aqueous solution of AgNO₃ with platinum electrodes.

Predict the product of electrolysis in the following:

A dilute solution of H₂SO₄ with platinum electrodes.

Predict the product of electrolysis in the following:

An aqueous solution of CuCl₂ with platinum electrodes.

How much electricity is required in coulomb for the oxidation of 1 mol of H₂O to O₂?

How much electricity is required in coulomb for the oxidation of 1 mol of FeO to Fe₂O₃?