Chitin is an example of which of the following?

Identify the organism shown in the given figure.

If $\omega$ is a complex cube root of unity,then $225+(3 \omega+8 \omega^2)^2+(3 \omega^2+8 \omega)^2$ is equal to:

$\int_{-1}^1 (a x^3 + b x) d x = 0$ for

In the concentration of $PbS$ containing $ZnS$ as impurity,the depressant used is:

Oxalic acid reacts with concentrated $H_2SO_4$ to give a mixture of two gases. When this mixture is passed through caustic potash,one of the gases is absorbed. What is the product formed by the absorbed gas with caustic potash?