Tag: chemistry

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

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

  1. 2, 1

  2. 2, 4

  3. 2, 5

  4. 2, 7
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Which of the following metal exists in free state?

  1. Gold

  2. Platinum

  3. Mercury

  4. All of above
Reveal answer Fill a bubble to check yourself
D Correct answer
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.
Multiple choice chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

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

  1. native metal

  2. minerals

  3. metalloids

  4. semi pure
Reveal answer Fill a bubble to check yourself
B Correct answer
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.
Multiple choice chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

Iron is mainly extracted from its oxide ores such as___________.

  1. Haemetite

  2. Magnetite

  3. Both a and b

  4. Ironide
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Which of the following metal fall under platinum group?

  1. Silver

  2. Osmium

  3. Rhodium

  4. Both b and c
Reveal answer Fill a bubble to check yourself
D Correct answer
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.