Tag: chemistry

Questions Related to chemistry

The salt we use in our food is:

chemistry acids, bases and salts common salt some useful compounds in everyday life salts and their properties

  1. $NaCl$

  2. $CaCl _2$

  3. $KCl$

  4. $MgCl _2$

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Correct Option: A
Explanation:

Sodium chloride$(NaCl)$, also known as common salt is used in food. It is obtained by evaporation of sea water.

However other salts like $MgCl _2,CaCl _2,KCl$ are used in replacement therapy and given when their amount in the body goes down.
Hence, the correct answer is option (A).

$ZnS$ is an example of :

ionic bond atomic structure and chemical bonding chemistry

  1. ionic compound

  2. covalent compound

  3. coordinate compound

  4. None of the above

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Correct Option: A
Explanation:

Zinc sulphide is an ionic compound. It is composed of $Zn^{2+} \ and \ S^{2-}$ ions.

Some atoms attain their noble gas configuration by transfer of electrons. This method of attaining inert gas configuration is known as :

ionic bond atomic structure and chemical bonding chemistry

  1. electrovalency

  2. covalency

  3. inertness

  4. stabilisation

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Correct Option: A
Explanation:

Electrovalency is the process of attaining inert gas configuration by transfer of electrons.

Na is more stable that $Na^+$.

ionic bond atomic structure and chemical bonding chemistry

  1. True

  2. False

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Correct Option: B
Explanation:

$Na^{+}$ is more stable due to completion of octet. $Na$ atom do not have complete octate thus it unstable and try to be stable by losing an electron.

A neutral atom of an element has a nucleus with nuclear charge $11$ times and mass $23$ times that of hydrogen. The element can form a stable charged ion by:

ionic bond atomic structure and chemical bonding chemistry

  1. losing 1 electron

  2. losing 2 electrons

  3. gaining 1 electron

  4. gaining 2 electrons

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Correct Option: A
Explanation:

Atomic number of hydrogen $= 1$.

$\therefore$ The atomic number of neutral atom $= 11$ & electronic configuration $= 2, 8, 1$. 
Therefore, on losing one electron, the atom forms the stable noble gas configuration as $2, 8$.

So, the correct option is A.

The element that exhibits both electro valency and covalency is?

ionic bond atomic structure and chemical bonding chemistry

  1. Neon

  2. Sodium

  3. Barium

  4. None

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Correct Option: A

In electrovalency :

ionic bond atomic structure and chemical bonding chemistry

  1. Transfer of electrons takes place

  2. Sharing of electrons takes place

  3. Sharing of electrons by one atom only

  4. None of the above

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Correct Option: A
Explanation:

In Ionic bonds, metals lose electron(s) and non-metals gain the electrons. Hence, the transfer of electron(s) takes place from metal to non-metal atom.


Therefore, option A is correct.

Sodium atom with electronic configuration 2, 8, 1 achieves stable electronic configuration by ----------  one electron from its outer shell.

ionic bond atomic structure and chemical bonding chemistry

  1. loosing

  2. gaining

  3. covalency

  4. none

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Correct Option: A
Explanation:

Sodium has unstable configuration $1s^2 2s^2p^6 3s^1$ and it achieves stable configuration by loosing one electron as $Na^+ - 1s^2 2s^2p^6$

Formula of Aluminium oxide is :

ionic bond atomic structure and chemical bonding chemistry

  1. $Al _{3}O _{2}$

  2. $Al _{2}O _{3}$

  3. $AlO$

  4. none of these

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Correct Option: B
Explanation:

Aluminium (2,8,3)
oxygen (2,6)
so aluminium oxide is $Al _2O _3$

Which of the following is not a common characteristic of an electrovalent compound?

ionic bond atomic structure and chemical bonding chemistry

  1. High melting point

  2. Conducts electricity 

  3. Consists of oppositely charged ions

  4. Ionizes when dissolved in water

  5. None of the above

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Correct Option: B
Explanation:

Only in molten and solution forms electrovalent compounds conduct electricity because ions flows in molten and solution forms. So, it is not the common characteristic of  electrovalent compound.

Hence option B is correct.