Calomel is

• Hg₂Cl₂

• Hg + Hg₂Cl₂

• 

• 

Which of the following complex neutralises three molecules of AgNO₃?

• [Co(NH₃)₆]Cl₃

• [Co(NH₃)₅Cl]Cl₂

• [Co(NH₃)₄Cl₂]Cl

• [Co(NH₃)₃Cl₃]

Elements which generally exhibit multiple oxidation states and whose ions are usually coloured are

• metalloids

• non- metals

• tranistion elements

• gases

The transition metals mostly are

• diamagnetic

• paramagentic

• neither diamagnetic nor paramagnetic

• both diamagnetic and paramagnetic.

The correct statement in respect of d-block elements is

• they are all metals

• they show variable valency

• they form coloured ions and complex salts

• All the above statements are correct

476.

On reduction of KMnO₄, by oxalic acid in acidic medium, the oxidation number of Mn changes. What is the magnitude of this change?

• From 7 to 2

• From 6 to 2

• From 5 to 2

• From 7 to 4

Zinc and mercury do not show variable valency like d-block elements because

• they are soft

• their d- shells are complete

• they have only two electron in the outer most sub shell

• Their d- shell are completed

Mark the oxide which is amphoteric in character

• CO₂

• SiO₂

• SnO₂

• CaO

The transition metals mostly are

• diamagnetic

• paramagnetic

• neither diamagnetic nor paramagnetic

• both diamagnetic and paramagnetic

The formula of a phosphate of a metal M, is MPO₄. The formula of its nitrate will be

• MNO₃

• M(NO${}_3^{-}$)₂

• M(NO₃)₃

• M₂(NO₃)₃