Tag: non-metals

Questions Related to non-metals

Metals found in a combined state in the earth's crust are known as:

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

  1. native metal

  2. minerals

  3. metalloids

  4. semi pure

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Correct Option: B
Explanation:
A mineral is a naturally occurring chemical compound and has one specific chemical composition of metals and other elements in the combined state.
An ore is a type of rock that contains sufficient minerals with important elements including metals that can be economically extracted from the rock.
A native metal is any metal that is found in its metallic form, either pure or as an alloy, in nature.
A metalloid is any chemical element which has properties in between those of metals and nonmetals, or that has a mixture of them.
All ores are minerals but not vice-versa.
The metals found in the combined state in earth's crust are called minerals.

Which of the following metals occur in free as well as combined state?

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

  1. Copper

  2. Silver

  3. Both a and b

  4. None of above

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Correct Option: C
Explanation:

Copper and silver are two metals which occur in free as well as combined state as sulphide, oxide or halide ores. 

Which of the following is the last stable element found and has highest boiling point?

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

  1. Rhodium

  2. Zirconium

  3. Gold

  4. Rhenium

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Correct Option: D
Explanation:

Rhenium has the highest boiling point and it is least stable element. It is unstable because, it is one of the element of Group-7 as most elements of group-7 are unstable.

Iron is mainly extracted from its oxide ores such as___________.

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

  1. Haemetite

  2. Magnetite

  3. Both a and b

  4. Ironide

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Correct Option: C
Explanation:

Iron is mainly extracted from its oxide ores such as haematite and magnetite. The iron extracted from these ores is mostly used in the manufacture of steel an alloy of iron. Iron is also an essential element found in biological systems.

Which of the following metal fall under platinum group?

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

  1. Silver

  2. Osmium

  3. Rhodium

  4. Both b and c

Show answer
Correct Option: D
Explanation:
The six platinum-group metals are ruthenium, rhodium, palladium, osmium, iridium, and platinum. They have similar physical and chemical properties,[clarification needed] and tend to occur together in the same mineral deposits.
So silver does not fall under platinum group.
Osmium and Rhodium both fall under platinum group.

Hence, option D is correct.

Minerals that have a relatively high concentration of metal and can be extracted in an easy and cost-effective process are called:

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

  1. Metalloids

  2. Gold crust

  3. Ores

  4. None of above

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Correct Option: C
Explanation:

Minerals that have a relatively high concentration of metal and can be extracted in an easy and cost-effective process are called ores.

The halide ore of sodium is called as_________.

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

  1. Horn salt

  2. Cryolite

  3. Rock salt

  4. Both a and c

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Correct Option: C
Explanation:

The halide ore of sodium is called as rock salt or common salt.

Silver glance or argentite is the_________.

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

  1. Sulphide ore of silver

  2. Carbonate ore of silver

  3. Halide ore of silver

  4. Silicate ore of silver

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Correct Option: A
Explanation:

Silver glance or argentite is the sulphide ore of silver.

Which of the following are halide ores?

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

  1. Siderite

  2. Cryolite

  3. Fluorspar

  4. Iron pyrite

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Correct Option: B,C
Explanation:
Siderite: carbonate ore $FeCO _3$
Cryolite: Halide ore $Na _3AlF _6$
Fluorspar: Halide ore $CaF _2$
Iron pyrite : Sulphide ore $ FeS _2$

Which of the following are found in Earth's crust mainly as oxides, sulphides and carbonates?

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

  1. Metals above in the activity series

  2. Metals in the middle of the activity series

  3. Metals at the bottom of the activity series

  4. All of these

Show answer
Correct Option: B
Explanation:

The metals at the bottom of the activity series are the least reactive. They are often found in a free state. For example, gold, silver, platinum and copper are found in the free state. Copper and silver are also found in the combined state as their sulphide or oxide ores. The metals at the top of the activity series $(K, Na, Ca, Mg$ and $Al)$ are so reactive that they are never found in nature as free elements. The metals in the middle of the activity series $ (Zn, Fe, Pb, etc.)$ are moderately reactive. They are found in the earth’s crust mainly as oxides, sulphides or carbonates. The ores of many metals are oxides. This is because oxygen is a very reactive element and is very abundant on the earth.