Class 12th

Kindly consider the following figure

Hence, electronic configuration of CO²⁺ is $\left[Ar\right]3d^{7}4s^0$ . In complex ${\left[Co{\left(CN\right)}_6\right]}^{4-},$ given ligand CN^- is $\therefore$ strong hence, after pairing in d-subshell, total number of unpaired electron =

spin magnetic moment = $\sqrt[]{1\left(1+2\right)}=\sqrt[]{3}=1.73BM$ $=1.73BM\approx 2.0BM$  

For Ni²⁺, crystal field CFSE magnitude shows the magnitude of absorbed light. Following are the energy absorbed order

  ${\left[NiC{l}_4\right]}^{2-}<{\left[Ni\left(H_{2}O\right)\right]}^{2+}<{\left[Ni{\left(CN\right)}_4\right]}^{2-}$

Hence order of colour of compounds are.

${\left[NiC{l}_4\right]}^{2-}>{\left[Ni{\left(H_{2}O\right)}_6\right]}^{2+}>{\left[Ni{\left(CN\right)}_4\right]}^{2-}$

Both statement are correct for the glass body heating, but reason is not correct explanation during heating process of glass, constituents unit rupture of glass body and gives the edge smoothness.

All structure can produce -CHO functional group which gives +ve test of Tollen's reagent except structure (II), because if forms ketonic group after tautomerisation

$X\underset{H_{2}S{O}_4}{\overset{Conc}{\to }}$ Brown fumes + Brown ring test with FeSO₄/H₂SO₄

$x\underset{HCl}{\overset{H_{2}S}{\to }}Y\left(ppt\right)\underset{HN{O}_3}{\overset{Conc}{\to }}dissolved\underset{N{H}_{4}OH}{\overset{}{\to }}$ Deep blue colour solution

In cation analysis of Cu⁺ ions, precipitate formed is CuS on treating with H₂S and HCl which dissolved in HNO₃ and produced blue colour complex solution ${\left[Cu{\left(N{H}_3\right)}_4\right]}^{++}$ in NH₄OH. Brown fumes and brown ring performance given by nitrate sample. Hence salt is Cu (NO₃)₂.

Candidates seeking admission to the BTech programme can enrol for admission with Class 12 marks. Candidates must complete Class 12 to enrol for the BTech course. The college offers only one UG course, i.e., BTech. National Fire Service College admissions are based on entrance exam.

2^nd sentence introduces the subject and gives further information about it in 4^th sentence; the use of pronoun 'it' in 1^st  and 3^rd  sentence gives further account of the subject.