HSC Science (Computer Science) 12th Standard Board Exam - Maharashtra State Board Important Questions for Chemistry

Explain effects of lanthanoid contraction.

Explain the cause of Lanthanoids contraction.

Explain  Optical activity

Write down the IUPAC name of the complex [Pt(en)₂Cl₂]²⁺. What type of isomerism is shown by this complex?

Write the hybridization and shape of the following complexe : [CoF₆]^3–

(Atomic number : Co = 27, Ni = 28)

Write the hybridization and shape of the following complexe : [Ni(CN)₄]^2–

^{(Atomic number : Co = 27, Ni = 28)}

What is ‘effective atomic number’ (EAN)?

What is ‘effective atomic number’ (EAN)?

Explain optical activity of lactic acid

How is Benzonitrile converted to Benzophenone?

Define ligand.

The IUPAC name of Na₃[AlF₆] is _____________

Calculate effective atomic number of iron in [Fe(CN)₆]⁴⁻ complex ion

Write the type of isomerism exhibited by [Co(NH₃)₅(NO₂)]²⁺ and [Co(NH₃)₅ONO]²⁺ pair of complex ion.

Explain homoleptic and heteroleptic complexes.

Explain the magnetic properties of [Ni(CN₄)]^2–.

Explain, why [Co(NH₃)₆]³⁺ ion is low spin? Calculate number of unpaired electrons and write the geometry of [Co(NH₃)₆]³⁺.

Distinguish between S_N1 and S_N2 mechanism of substitution reaction.

Explain optical isomerism in 2-chlorobutane.

Write IUPAC name of the product ‘B’ in the following reaction sequence.

\[\ce{C2H5OH ->[NaBr/H2SO4][\Delta] A ->[Nal][acetone]B}\]