Tag: chemistry

Questions Related to chemistry

Which of the following is/ are property of non-metals?
(a) Non-metals are malleable.
(b) Non-metals are non ductile.
(c) Non-metals are brittle.

chemistry composition of matter physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. a, b

  2. b, c

  3. a, c

  4. a, b, c

Show answer
Correct Option: B
Explanation:

Non-metals are non-malleable, non-ductile when they are beaten with hammer or stretched they break into pieces, so they are brittle.

Which of the following when stretched, break into pieces?

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Calcium

  2. Phosphorus

  3. Iron

  4. Radium

Show answer
Correct Option: B
Explanation:

When sulphur or phosphorus is stretched, they break into pieces. Non metals are non-malleable non-ductile.

Which one is the softest solid non-metal among the following?
Diamond, Oxygen, Sulphur, Bromine

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Diamond

  2. Oxygen

  3. Sulphur

  4. Bromine

Show answer
Correct Option: C
Explanation:

Most of the solid non-metals are quite soft. For example - sulphur and phosphorous are solid non-metals which are quite soft.

 Which of the following non-metal is lustrous?

chemistry composition of matter physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Diamond

  2. Iodine

  3. Both $A$ and $B$

  4. None of the above

Show answer
Correct Option: C
Explanation:

Diamond and iodine both are non metal and lustrous.

Which of the following is the largest in size?

chemistry composition of matter physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. $Br$

  2. $I$

  3. $I^-$

  4. $I^+$

Show answer
Correct Option: C
Explanation:

Answer : $I^{\ominus}$

(1) We know that from top to bottom atomic size is increases. So $I$ its having higher atomic size then $Br$.
(2) In $I, I^{\ominus}$ and $I^{\oplus}$
$I^{\ominus}$ have the largest atomic size because $I^{\ominus}$ has one extra electron in its valence shell which lead to increase in atomic size.
$\therefore I^{\ominus} > I > I^{\oplus} > Br$.

Which characteristics are required for a element to behave as electrical conductor?

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. It should have valence electron

  2. It should have free electron

  3. It easily provide electron to other element

  4. Both $B$ and $C$

Show answer
Correct Option: D
Explanation:

Electrical conductors elements have free electrons, which they can easily provide to conduct electricity. This characteristics are generally available in metals.

Which allotrope of carbon do not conduct electricity?

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Graphite

  2. Diamond

  3. Fullerene

  4. Both b and c

Show answer
Correct Option: D
Explanation:

Carbon is a non-metal which have allotropic form that is graphite, diamond and fullerene. Out of this three only graphite is conductor of electricity. Diamond and fullerene do not conduct electricity.

Non-metals are brittle while metals are ductile. Why?

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Because of lesser extent of bonding in non-metals

  2. Because of greater extent of bonding in non-metals

  3. Because of smaller size of non-metallic atoms

  4. Because of lower conductivity of non-metals

Show answer
Correct Option: A
Explanation:

The basic difference between metals and non-metals is the extent of bonding.Metals have very high extent of bonding than that in non-metals which makes the metal malleable. and non-metals brittle.

Which of the following elements cannot be beaten into thin wires?

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. $O$

  2. $P$

  3. $S$

  4. All of these

Show answer
Correct Option: D
Explanation:

Non-metals are generally non-ductile and cannot be beaten into thin wires. All given elements $O,P,S$ are non metals and do not have property of ductility. 

One metal which is not ductile at room temperature is:

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. $Cu$

  2. $Sn$

  3. $Pb$

  4. $Hg$

Show answer
Correct Option: D
Explanation:

$Hg$ is liquid at room temperature and cannot be beaten into thin wire; thus is not ductile at room temperature. All other metals $Cu, Sn ,  Pb$ are ductile at room temperature.