Class 10 Maths Olympiad 21 January part-2 | Maths Olympiad full solution PSEB | GAURAV CROOKS #pseb

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A 150 mL of solution of I_(2) is divided into two unequal parts. I part reacts with hypo solution solution in acidic medium. 15 mL of 0.4 M hypo was consumed. II part was added with 100 mL of 0.3 M NaOH solution. Residual base required 10 mL 0.3 M H_2SO_4 solution for complete neutralization. What was the initial concentration of I_(2) ?

What is the minimum pH required to prevent the precipitation of ZnS in a solution that is 0.01 M ZnCl_(2) and saturated with 0.10 M H_(2)S ? ["Given" :K_(sp)=10^(-21),K_(a_1)xxK_(a_2)=10^(-20)]

A closed coil having 100 turns is rotated in a uniform magnetic field B = 4.0 X 10^(-4) T about a diameter which is perpendicular to the field. The angular velocity of rotation is 300 revolutions per minute. The area of the coil is 25 cm^2 and its resistance is 4.0 Omega. Find (a) the average emf developed in the half a turn form a position where the coil is perpendicular to the magnetic field, (b) the average emf in a full turn and (c) the net charge displaced in part (a).