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The p-Block Elements

Multiple Choice Questions

651. The P—P—P bond angle in white phosphorus is

120°
109° 28'
90°
60°

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652. Catalytic oxidation of NH₃ gives

dinitrogen pentoxide
nitric oxide
nitrogen dioxide
nitrogen

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653. FeSO₄ forms brown ring with

NO₃
NO₂
NO
N₂O₃

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654.

Oxygen molecule exhibits

Paramagnetism
Dimagnetism
Ferromagnetism
Ferrimagnetism

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655.

Oxygen molecule exhibits

Paramagnetism
Dimagnetism
Ferromagnetism
Ferrimagnetism

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656.

When SO₂ is passed through acidified K₂Cr₂O₇ solution

The solution turns blue
The solution is decolourised
SO₂ is reduced
Green Cr₂(SO₄)₃ is formed

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657.

which of the following is oxidised by SO₂?

Mg
K₂Cr₂O₇
KMnO₄
All the above

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Short Answer Type

658. What type of hybridisation is associated with N in NH₃? What is the expected bond angle in NH₃?

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659.

why is bond dissociation of energy of fluorine molecule less than that of chlorine molecule ?

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660. What are the two important oxidation states of group 16 elements in the periodic table?

Group 16 elements show oxidation property, the stability of -2 oxidation state decreases down the group.
Polonium hardly shows –2 oxidation state. Since electronegativity of oxygen is very high, it shows only negative oxidation state as –2 except in the case of OF2 where its oxidation state is + 2. Other elements of the group exhibit + 2, + 4, + 6 oxidation states but + 4 and + 6 are more common. Sulphur, selenium and tellurium usually show + 4 oxidation state in their compounds with oxygen and + 6 with fluorine.

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