HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions for Chemistry

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?

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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?

The most common oxidation state of lanthanoids is ______.

The general formula of 2° and 3° alcohol is:

Amongst the following identify the criterion for a process to be at equilibrium -

1. ΔG < 0
2. ΔG > 0
3. ΔS_total=0
4. ΔS < 0

The equilibrium constant Kp for the reaction,

H_2(g) + I_2(g) → 2HI_(g) is 130 at 510 K. Calculate ΔG^o for the following reaction at the same temperature: 2HI_(g) → H_2(g) + I_2(g) [Given: R = 8.314 J K^-1 mol^-1 ]