Tag: chemistry

Questions Related to chemistry

Most metals are hard except _______ and _________.

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. radium, nitrogen 

  2. sodium, potassium

  3. osmium, carbon 

  4. copper, iron 

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Correct Option: B
Explanation:

Most metals are hard except sodium and potassium. They can be easily cut with a knife. Osmium is hard enough to scratch glass.

Which of the following is not malleable?

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. Sulphur

  2. Selenium

  3. Phosphorus

  4. All of the above

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Correct Option: D
Explanation:

Non-metals are not malleable. They are brittle and hence they break easily. Such non-metals cannot be deformed by a hammer or rolling. Hence, non-metals cannot be deformed to form thin sheets.

Which of the following non-metal can be malleable?

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. Sulphur

  2. Phosphorus

  3. Nitrogen

  4. Graphite

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Correct Option: D
Explanation:

Graphite is a non-metal consisting of 3 carbon atoms. he weak attractions between the layers of atoms in graphite are easily broken. Therefore, graphite is soft and the layers can slide over each other.

Which among the following will be the softest metal?

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. Sodium

  2. Aluminium

  3. Iron

  4. All of the above

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Correct Option: A
Explanation:

Sodium and potassium are soft metal which can be easily cut with a knife.

Two substance silver and carbon are thrown into a furnace. Which will melt earlier?

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. Silver

  2. Carbon

  3. Both will melt together

  4. None of these

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Correct Option: A

Out of sulphur and gold, which will be have higher melting point?

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. Sulphur

  2. Gold

  3. Both have equal melting point

  4. None of the above

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Correct Option: B

Melting of iron is _____ than sulphur.

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. higher

  2. lower

  3. equal

  4. none of the baove

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Correct Option: A
Explanation:

Melting point of metals will be higher than non-metal. So, iron will have higher melting point.

Mark the incorrect statement(s).
a) Most of the metals are soft.
b) All metals are equally hard.
c) Sodium is a soft non-metal.

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. a, b

  2. b, c

  3. a, c

  4. All of the above

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Correct Option: D
Explanation:

Most of the metals are hard. But all the metals are not equally hard. The hardness varies from metal to metal. Most of the metals like iron, copper etc. are very hard. Sodium, potassium are exceptions.

Metals are ............, i.e., they make sound when hit with an object.

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. sonorous

  2. lusturous

  3. reactive

  4. brittle

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Correct Option: A
Explanation:

Sound making property is known as sonority, i.e., when hit with an object they make sound.

The property of a metal of having a shiny surface is called:

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. luster.

  2. sonority.

  3. conductivity.

  4. All of the above.

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Correct Option: A
Explanation:

Gold, silver copper have shiny surfaces, as they are metals. So are lustrous.