Which of the following is commonly used in a desiccator in the laboratory?

Which of the following statement$(s)$ is/are true?
$A.$ An organism represents/occupies a place or position in the system of classification.
$B.$ One specific epithet may be present in different genus representing different species.
$C.$ Human belongs to $Homo$ species.
$D.$ Animals,mammals,and dogs represent the taxa at the same level.

Which kingdom consists of organisms that are multicellular,aquatic or terrestrial,heterotrophic,and eukaryotic?

The compound formed when gypsum is dissolved in aqueous ammonium sulphate solution is:

The charge on colloidal particles is due to

Which of the following isomerism is not possible for complexes having molecular formulae?
$(I) Pt(SCN)_2 \cdot 3PEt_3$,$(II) CoBr \cdot SO_4 \cdot 5NH_3$,$(III) FeCl_2 \cdot 6H_2O$