HSC Science (Electronics) इयत्ता १२ वी - Maharashtra State Board Question Bank Solutions

Calculate the effective atomic number of the central metal atom in the following  compounds:

Cr(CO)₆ Cr(Z=24)

A pure semiconductor is ________.

(a) an extrinsic semiconductor

(b) an intrinsic semiconductor

(c) p-type semiconductor

(d) n-type semiconductor

Distinguish between p-type and n-type semiconductors.

What is the ratio of octahedral holes to the number of anions in hexagonal closed packed structure?

A substance which shows the highest entropy is ___________.

What is the action of lithium aluminum hydride in the presence of ether on the following compounds? 
a. Nitroethane 
b. 2-Methyl-1-nitropropane

What are the stable oxidation states of plutonium, cerium, manganese, Europium?

Answer the following

Why nobelium is the only actinoid with a +2 oxidation state?

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Explain with the help of a balanced chemical equation, why the solution of Ce(IV) is acidic.

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What is meant by ‘shielding of electrons’ in an atom?

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The atomic number of an element is 90. Is this element diamagnetic or paramagnetic?

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What is meant by diamagnetic and paramagnetic? Give one example of diamagnetic and paramagnetic transition metal and lanthanoid metal.

Why the ground-state electronic configurations of gadolinium and lawrentium are different than expected?

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Cerium and Terbium behave as good oxidising agents in the +4 oxidation state. Explain.

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Europium and ytterbium behave as good reducing agents in the +2 oxidation state explain.

What are the causes of lanthanide contraction?

Lanthanoids are characterized by the gradual filling of ______ orbitals.

What are inner transition elements?

What are the conditions for spontaneous and non-spontaneous reactions in terms of free
energy change?

What are rare earth elements?