Class 12th

Given below are two statements:

Statement I : ${\left[Ni{\left(CN\right)}_4\right]}^{2-}$  is square planar and diamagnetic complex, with dsp² hybridizatin for Ni but $\left[Ni{\left(CO\right)}_4\right]$  is tetrahedral, paramagnetic and with sp³ hybridization for Ni.

Statement II : ${\left[NiC{l}_4\right]}^{2-}and\left[Ni{\left(CO\right)}_4\right]$  both have same d-electron configuration have same geometry and are paramagnetic.

In light the above statements, choose the correct answer from the options given below

Which one of the lanthanoids given below is the most stable in divalent form?

Given below are two statements:

Statement I : The pentavalent oxide of group-15 element, E₂O₅, is less acidic than trivalent oxide, E₂O₃, of the same element.

Statement II : The acidic character of trivalent oxide of group 15 elements, E₂O₃ decreases down the group.

In light of the above statements, choose most appropriate answer form the options given below

Nitrogen gas is obtained by thermal decomposition of

Dihydrogen reacts with CuO to give

Given are two statements one is labeled as Assertion A and other is labeled as Reason R.

Assertion A : Magnesium can reduce Al₂O₃ at a temperature below 1350°C, while above 1350°C aluminium can reduce MgO

Reason R : The melting and boiling points of magnesium are lower thatn those of aluminium.

In light of the above statements, choose most appropriate answer for the options given below

Element “E” belongs to the period 4 and group 16of the periodic table. The valence shell electron configuration of the element, which is just above “E” in the group is

The Zeta potential is related to which property of colloids

The incorrect statement about the imperfections in solids is

A small bar magnet placed with its axis at ${30}^{?}$ with an external field of $0.06\mathrm{T}$ experiences a torque of $0.018\mathrm{N}\mathrm{m}$ . The minimum work required to rotate it from its stable to unstable equilibrium position is: