The structure of a peptide is given below.


If the absolute values of the net charge of the peptide at $\mathrm{pH}$ $=2$, $\mathrm{pH}=6$, and $\mathrm{pH}=11$ are $\left|Z_1\right|,\left|Z_2\right|$, and $\left|Z_3\right|$, respectively, then what is $\left|Z_1\right|+\left|Z_2\right|+\left|Z_3\right|$?

An organic compound (C₈H₁₀O₂) rotates plane-porarised light. It produces pink color with neutral FeCl₃ solution. What is the total number of all the possible isomers for this compound?

In an experiment, m grams of a compound X (gas/liquid/solid) taken in a container is loaded in a balance as shown in figure I below.

In the presence of a magnetic field, the pan with X is either deflected upwards (figure II), or deflected downwards (figure III), depending on the compound X. Identify the correct statement(s).

Which of the following plots is(are) correct for the given reaction?

([P]₀ is the initial concentration of P)