Tag: non-metals

Questions Related to non-metals

Blister copper is:

chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

  1. pure copper

  2. ore of copper

  3. alloy of copper

  4. impure copper

Show answer
Correct Option: D
Explanation:
Blister copper is an impure form of copper having a blister-like surface due to the release of gas during cooling. The purity of this product is 98%, it is known as blister because of the broken surface created by the escape of sulfur dioxide gas as blister copper pigs or ingots are cooled.

Silver can be separated from lead by:

chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

  1. fractional crystallization

  2. amalgamation

  3. cupellation

  4. addition of zinc

Show answer
Correct Option: D
Explanation:
The Parkes process is a pyrometallurgical industrial process for removing silver from lead during the production of bullion. It is an example of liquid–liquid extraction.
The process takes advantage of two liquid-state properties of zinc. The first is that zinc is immiscible with lead, and the other is that silver is 3000 times more soluble in zinc than it is in lead. When zinc is added to liquid lead that contains silver as a contaminant, the silver preferentially migrates into the zinc. Because the zinc is immiscible in the lead it remains in a separate layer and is easily removed. 

Statement: Valuable gemstones such as rubies and sapphire contain aluminium oxides along with traces of transition metals as impurities.


State whether the given statement is true or false.

chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Sapphire is a gemstone, a variety of the mineral corundum, an aluminium oxide. It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colours.


The only colour which sapphire cannot be is red – as red-coloured corundum is called ruby. Rubies are crystalline forms of aluminium oxide, which are red due to the presence of chromium as an impurity.

A rare variety of natural sapphire, known as colour-change sapphire, exhibits different colours in a different light.

The colour-change effect is caused by the interaction of the sapphire, which absorbs specific wavelengths of light, and the light source, whose spectral output varies depending upon the illuminant.
Transition-metal impurities in the sapphire, such as chromium and vanadium, are responsible for the colour change.

Hence, the given statement is $\text{true}$

Aluminium metal is purified by:

chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

  1. Hoopes process

  2. Halls process

  3. Serpecks process

  4. Baeyers process

Show answer
Correct Option: A
Explanation:

All processes are used in Aluminium metallurgy but the Hoopes process is a metallurgical process, used to obtain the aluminium metal of very high purity.
The Bayer process is the principal industrial means of refining bauxite to produce alumina (aluminium oxide).
The Hall–Héroult process is the major industrial process for smelting aluminium. 
Serpeck's process  is used for the purification of bauxite ore containing silica  as the main impurity

 Froth floatation process is used for the concentration of the ore of:

chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

  1. $Fe$

  2. $Al$

  3. $Cr$

  4. $S$

Show answer
Correct Option: D
Explanation:
Froth flotation is a process for selectively separating hydrophobic materials from hydrophilic.It has been described as "the single most important operation used for the recovery and upgrading of sulfide ores". 

The material mixed before ore is subjected for smelting in the extraction of iron are:

chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

  1. cake and silica

  2. coke and limestone

  3. limestone and silica

  4. coke, limestone and silika

Show answer
Correct Option: B
Explanation:

Smelting is a form of extraction metallurgy. Its main purpose is to get pure metal from th ore. Coke and limestone are added. Coke acts as an reducing agent and limestone acts as a flux. Concentrated ore of iron i.e. haemetite is used.

Which of the following non-metal is a good conductor of electricity?

chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

  1. Graphite

  2. Hydrogen

  3. Phosphorous

  4. Bromine

Show answer
Correct Option: A
Explanation:

Graphite is a non-metal. Generally, non-metals are bad conductors of electricity but graphite is an exception. Because the structure of graphite is in such a way that electrons can move freely and conduct electricity. Due to this property, it is used in making of pencil cells. 


Hence, the correct option is $A$

Heamatite ore is concentrated by:

chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

  1. gravity separation method

  2. forth floatation

  3. amalgamation

  4. hand picking

Show answer
Correct Option: A
Explanation:

Heamatite is an iron oxide with a chemical composition of $Fe _2O _3$. Gravity Separation or Hydraulic Washing (Levigation)

Heamatite ore is concentrated by gravity separation method. This method of concentration of the ore is based on the difference in specific gravities of the metallic ore and gangue particles. Generally metal ores are heavier than the gangue associated with them.
By flowing the powdered ore in a current of water, the lighter rocky impurities can be washed away and the ore particles are left behind. For this, either wilfley table or Hydraulic classifier is used. Generally oxide and carbonate ores are concentrated by this method. i.e. haematite and cerussite.

Which non-metallic element is in liquid form?

chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

  1. Carbon

  2. Hydrogen

  3. Bromine

  4. Phosphorous

Show answer
Correct Option: C
Explanation:

Bromine is a halogen and a non metal. It is a red brown liquid at room temperature. Its atomic number is 35. It belongs to fourth period and $VII :A$ group of the periodic table. 

Carbon and phosphorus are solids and hydrogen is a gas.

In general, the number of electrons in the outermost shell of a metal atom is:

chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

  1. 1

  2. 1-3

  3. 1-8

  4. 8

Show answer
Correct Option: B
Explanation:

Metals have 1-3 electrons in their outermost orbit. They are present on the extreme left of the periodic table. They tend to donate electrons and obtain the stable electronic configuration of the nearest noble gas. The valency on metals also ranges from 1-3.


Hence, the correct option is $B$