Live practice

Fresh milk has pH about 6. Predict and explain the change in pH as the milk becomes curd.

A die has labels 1,1,2,2,2,3. Find P(2), P(1 or 3), and P(not 3).

If lim(x→1)[f(x)−2]/(x²−1)=π, find lim(x→1)f(x).

Let x, y and z be respectively the fourth, tenth and sixteenth terms of a geometric progression. Prove that x, y, z themselves form a geometric progression.

A five-course programme is chosen from nine available courses, with two specified courses compulsory. Count the possible programmes.

Complete every requested part of miscellaneous exercise, question 5: −12 < 4 − ≤2

Complete every requested part of exercise 3.3, question 3: cot 2 + cosec + 3tan 2 = 6

For \(f(x)=x+1\), \(g(x)=2x-3\), find \(f+g\), \(f-g\), and \(\frac{f}{g}\), including the quotient's restriction.

Explain why acetic acid rather than sulfuric acid is used before the lead acetate test for sulfur.

Dihydrogen gas used in Haber’s process is produced by reacting methane from natural gas with high temperature steam. The first stage of two stage reaction involves the formation of CO and H2. In second stage, CO formed in first stage is reacted with more steam in water gas shift reaction, CO (g) + H2O (g) CO2 (g) + H2 (g) If a reaction vessel at 400 °C is charged with an equimolar mixture of CO and steam such that pco = pH O = 4.0 bar, what will be the partial pressure of H2 at equilibrium? 2 Kp= 10.1 at 400°C