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

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.

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–.

Define coordination number.

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.

Give reason. Though alkyl halides are moderately polar, they are insoluble in water.

Explain optical activity of 2-chlorobutane.

Explain primary benzylic halide shows higher reactivity by S_N1 mechanism than other primary alkyl halide.

What is Grignard reagent? How is it prepared? Why are they prepared under anhydrous condition?

What is the action of following on ethyl bromide?

\[\ce{Mg}\] in dry ether