List of top Chemistry Questions asked in CBSE CLASS XII

Write the reactions of (i) aromatic and (ii) aliphatic primary amines with nitrous acid

Complete the following reactions:

Using IUPAC norms write the systematic names of the following:
(i)$ [Co(NH_3)_6]Cl_3 $
(ii) $[Pt(NH_3)_2Cl(NH_2CH_3)]Cl $
(iii) $[Ti(H_2O)_6]^{3+} $
(iv) $[Co(NH_3)_4Cl(NO_2)]Cl $
(v)$ [Mn(H_2O)_6]^{2+} $
(vi) $[NiCl_4]^{2–}$
(vii) $[Ni(NH_3)_6]Cl_2 $
(viii) $[Co(en)_3]^{3+} $
(ix)$ [Ni(CO)_4]$

Using IUPAC norms write the formulas for the following:
(i) Tetrahydroxidozincate(II)
(ii) Potassium tetrachloridopalladate(II)
(iii) Diamminedichloridoplatinum(II)
(iv) Potassium tetracyanidonickelate(II)
(v) Pentaamminenitrito-O-cobalt(III)
(vi) Hexaamminecobalt(III) sulphate )
(vii) Potassium tri(oxalato)chromate(III)
(viii) Hexaammineplatinum(IV)
(ix) Tetrabromidocuprate(II)
(x) Pentaamminenitrito-N-cobalt(III)

Specify the oxidation numbers of the metals in the following coordination entities:
(i)$ [Co(H_2O)(CN)(en)_2] ^{2+}$
(ii) $[CoBr_2(en)_2]^{+}$
(iii)$ [PtCl_4]^{ 2–} $
(iv) $K_3[Fe(CN)_6]$
(v) $[Cr(NH_3)_3Cl_3] $

What is meant by unidentate, didentate and ambidentate ligands? Give two examples for each.

Write short notes on the following:

(i) Carbylamine reaction

(ii) Diazotisation

(iii) Hofmann’s bromamide reaction

(iv) Coupling reaction

(v) Ammonolysis

(vi) Acetylation

(vii) Gabriel phthalimide synthesis.

Explain with two examples each of the following: coordination entity, ligand, coordination number, coordination polyhedron, homoleptic and heteroleptic.

Describe a method for the identification of primary, secondary and tertiary amines. Also write chemical equations of the reactions involved.

$FeSO_4$ solution mixed with$ (NH_4)_2SO_4 $ solution in$ 1:1$ molar ratio gives the test of $Fe^{2+}$ ion but $CuSO_4$ solution mixed with aqueous ammonia in $ 1:4 $ molar ratio does not give the test of $Cu^{2+}$ ion. Explain why?

Explain the bonding in coordination compounds in terms of Werner’s postulates.

Write IUPAC names of the following compounds and classify them into primary, secondary and tertiary amines.

(i) (CH3 )2CHNH2 (ii) CH3 (CH2 )2NH2 (iii) CH3NHCH(CH3 )2

(iv) (CH3 )3CNH2 (v) C6H5NHCH3 (vi) (CH3CH2 )2NCH3 (vii) m–BrC6H4NH2

${AgNO_3}$ does not decompose where :