Questions

The main excretory organs of insects and spiders are Malpighian tubules.

Hard disk is the secondary storage device, which holds the data in bulk, and it holds the data on the magnetic medium of the disk.Hard disks have a hard platter that holds the magnetic medium, the magnetic medium can be easily erased and rewritten, and a typical desktop machine will have a hard disk with a capacity of between 10 and 40 gigabytes. Data is stored onto the disk in the form of files.

TRAP, RST7.5, RST6.5, RST5.5, INTR.

Monopotassium tartarate was used in baking powder.

Metallic bond is a bond between two metal atoms. Here in the given option Hg is the only metal with metallic bond.

Lime mortar is generally made with Hydraulic lime.

No work done as there is no external external pressure in free expansion. 

Hence, Work done in a free expansion process is Zero.