List of top Chemistry Questions asked in TN Board

Explain the mechanism of Cannizzaro reaction.
What is Lanthanoid contraction? What are the causes and effects of Lanthanoid contraction?
(a) (i) Explain the thermodynamics of cell reactions.
(ii) Why salt bridge is used in Galvanic cells?
(a) (i) Differentiate crystalline solids and amorphous solids.
(ii) Explain the rate determining step with an example.
(a) (i) Differentiate crystalline solids and amorphous solids.
(ii) Explain the rate determining step with an example.
(i) How will you convert benzene diazonium chloride to biphenyl? Give the name of the reaction.
(ii) How will you confirm the presence of keto group at C-2 carbon in Fructose molecule?
Based on Valence bond theory, explain why the geometry of [Ni(CO)₄] is tetrahedral and [Ni(CN)₄]²- is square planar.
How is terylene prepared?
(i) Give any three uses of silicones.
(ii) Write a short note on Fischer-Tropsch synthesis.
Calculate the percentage efficiency of packing in case of body centered cubic (BCC) structure.
What are hormones? Give examples.
Prove that in case of first order reaction t₉₉.₉% = 10 t₁/₂
(i) Write a short note on Gravity Separation process.
(ii) Sulphuric acid is a dehydrating agent. Explain with suitable examples.
List any three characteristics of catalysts.
An organic compound (A) with molecular formula C₂H₇N reacts with nitrous acid to form compound (B) which is unstable. Hence compound (B) gets converted to compound (C). Compound (C) is used as a substitute for petrol. Identify compounds (A), (B) and (C).
How will you convert phenol to phenolphthalein?
Give the basic requirement for vapour phase refining.
How do antiseptics differ from disinfectants?
Give the electronic configuration of Ce⁴⁺ and Co²⁺.
Calculate the pH of 1.5 × 10⁻³ M solution of Ba(OH)₂.
Give the tests for carboxylic acid group.
Which type of isomerism is exhibited by the following compounds? (a) [Co(NH₃)₄ Br₂]Cl and [Co(NH₃)₄ ClBr]Br
(b) [Co(NH₃)₅ NO₂]²⁺ and [Co(NH₃)₅ ONO]²⁺
(c) [Pt(NH₃)₄][PdCl₄] and [Pd(NH₃)₄][PtCl₄]
Explain the method by which colloidal solutions of ink and graphite are prepared.
Mention the type of hybridisation in the following compounds:
(a) BrF₅ (b) BrF₃
What is calcination? Give an example.