Which of the following is a biodegradable polymer?

Which of the following statements is incorrect?

The truth table for the system of four $NAND$ gates as shown in the figure is:

Assertion: Addition of silver ions to a mixture of aqueous sodium chloride and sodium bromide solution will first precipitate $AgBr$ rather than $AgCl$.
Reason: $K_{sp}$ of $AgCl > K_{sp}$ of $AgBr$.

The number of angular and radial nodes of $4d$ orbital respectively are

Solid $NaCl$ is a bad conductor of electricity since