Tag: chemistry

Quizzes (490) Questions (9892)

Questions Related to chemistry

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

The salt we use in our food is:

  1. $NaCl$
  2. $CaCl _2$
  3. $KCl$
  4. $MgCl _2$
Reveal answer Fill a bubble to check yourself
A Correct answer
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).

Multiple choice ionic bond atomic structure and chemical bonding chemistry

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

  1. electrovalency

  2. covalency

  3. inertness

  4. stabilisation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

Multiple choice ionic bond atomic structure and chemical bonding chemistry

Na is more stable that $Na^+$.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

Multiple choice ionic bond atomic structure and chemical bonding chemistry

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:

  1. losing 1 electron

  2. losing 2 electrons

  3. gaining 1 electron

  4. gaining 2 electrons
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice ionic bond atomic structure and chemical bonding chemistry

In electrovalency :

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice ionic bond atomic structure and chemical bonding chemistry

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

  1. loosing

  2. gaining

  3. covalency

  4. none
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

Multiple choice ionic bond atomic structure and chemical bonding chemistry

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

  1. High melting point

  2. Conducts electricity

  3. Consists of oppositely charged ions

  4. Ionizes when dissolved in water

  5. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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.