Tag: chemistry

Questions Related to chemistry

Which of the following is not an ore of sulphate?

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

  1. Anglesite

  2. Baryte

  3. Gypsum

  4. None of the above

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Correct Option: D
Explanation:

Anglesite, baryte and gypsum all are ores of sulphate.

 Which of the following is most abundant element in the earth crust?

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

  1. Oxygen

  2.  Nitrogen

  3. Hydrogen

  4. Argon

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Correct Option: A
Explanation:

The most abundant elements in the earth crust is Oxygen as many compounds are in form of their oxides.

The most abundant element in air is nitrogen followed by oxygen.

The most abundant metal in the earth's crust is :

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

  1. Silver

  2. Aluminium

  3. Calcium

  4. Gold

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Correct Option: B
Explanation:

The most abundant metal in the earth's crust is $Al$.

Which valence shell electrons arrangement is that of a metallic element?

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

  1. 2, 1

  2. 2, 4

  3. 2, 5

  4. 2, 7

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Correct Option: A
Explanation:

Answer : $2, 1$

(1) $2, 1$ valence shell electrons arrangement for Lithium metal. (electronic configuration is $1s^{2} 2s^{1}$
(2) Other valence shell $e^{\ominus}$ are $p-$block elements of which is generally non-metals of metalloids.

Which of the following metal exists in free state?

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

  1. Gold

  2. Platinum

  3. Mercury

  4. All of above

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Correct Option: D
Explanation:

A native metal is any metal that is found in its metallic form, either pure or as an alloy, in nature.

Few examples are gold and silver, platinum, mercury.

These elements exist as these are less reactive and do not form any kind of alloys in their natural state.

Option D is correct.

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

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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.