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Anomalous Behaviour of Beryllium - Practice Questions & MCQ

Edited By admin | Updated on Sep 18, 2023 18:35 AM | #JEE Main

Quick Facts

  • Anomalous Behaviour of Beryllium is considered one the most difficult concept.

  • 43 Questions around this concept.

Solve by difficulty

A metal M  readily forms its sulphate MSO_{4}  which is water­-soluble. It forms its oxide MO  which becomes inert on heating. It forms an insoluble hydroxide M(OH)_{2}  which is soluble in NaOH  solution. Then M is 

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason

Assertion A: Beryllium has less negative value of reduction potential compared to the other alkaline earth metals.

Reason : Beryllium has large hydration energy due to small size of \mathrm{Be^{2+}} but relatively large value of atomization enthalpy

In the light of the above statements, choose the most appropriate answer from the options given below

Which hydride among the following is less stable?

Be(OH)_{2} reacts with Sr(OH)_{2} to yield an ionic salt. Choose the incorrect option related to this reaction from the following :

Concepts Covered - 0

Anomalous Behaviour of Beryllium

Berylium differs from rest of the alkaline earth metals on account of its small atomic size, high electronegativity and a slight difference in electronic configuration. Be2+ is very small. It exerts a high polarising effect on any anion associated with it. On account of this, beryllium compounds show covalent character. Its compounds have low melting points and are soluble in organic solvents. These are hydrolysed in water.

The main points of difference are given below:

  • It is the hardest of all alkaline earth metals.
  • The melting and boiling points of the beryllium are the highest.
  • It is not affected by the atmosphere.
  • It does not decompose water.
  • It has the tendency to form covalent compounds
  • It does not react directly with hydrogen.
  • It dissolves in alkalies with the evolution of hydrogen.
  • It does not liberate hydrogen from acids readily.
  • Its oxide is amphoteric in nature.
  • Its hydroxide is amphoteric in nature.
  • Its carbide on hydrolysis evolves methane.
  • Its carbonate is not stable towards heat.
  • Its sulphate is soluble in water.
  • BeCl2 is a covalent compound.
  • It has a strong tendency to form complex compounds.
  • It has a tendency to form alloys.

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