Question 1

Lustre is the shine of a material.

(a) What are Lustrous objects? Give examples

(b) What are non-lustrous objects? Give examples

(c) Name a non-metal that is lustrous in nature (HINT: it is the hardest known material).

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Solution

(a) Lustrous materials are those materials that have shiny surfaces. For example, gold and silver.
(b) Non-lustrous substances are those that do not have a shiny surface. For example, wooden blocks, plastic sheets.
(c) Diamond is a non-metal that is lustrous in nature.

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Question 1

Lustre is the shine of a material.

(a) What are Lustrous objects? Give examples

(b) What are non-lustrous objects? Give examples

(c) Name a non-metal that is lustrous in nature (HINT: it is the hardest known material).

Q. What are lustrous and non-lustrous materials?

(a) Define non-metal . Give five examples of non-metals.
(b) Name a non-metal which conducts electricity.
(c) Name a non-metal having lustre (shining surface).
(d) Name a non-metal which reacts with oxygen? Explain with an example. Give equation of the reaction involved. What is the nature of the product formed? How will you demonstrate it?

Q. Question 30
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous; non-sonorous; non-malleable and are coloured.
(a) Name a lustrous non-metal.
(b) Name a non-metal which exists as a liquid at room temperature.
(c) The allotropic form of a non-metal is a good conductor of electricity. Name the allotrope.
(d) Name a non-metal which is known to form the largest number of compounds.
(e) Name a non-metal other than carbon which shows allotropy.
(f) Name a non-metal which is required for combustion.

Q. Give one example of each of the following.
(a) A non-metal which is lustrous
(b) A non-metal which is liquid at room temperature
(c) A metal which is soft
(d) A metal which is non-malleable

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Question 1 Lustre is the shine of a material. (a) What are Lustrous objects? Give examples (b) What are non-lustrous objects? Give examples (c) Name a non-metal that is lustrous in nature (HINT: it is the hardest known material).

(a) Lustrous materials are those materials that have shiny surfaces. For example, gold and silver.(b) Non-lustrous substances are those that do not have a shiny surface. For example, wooden blocks, plastic sheets.(c) Diamond is a non-metal that is lustrous in nature.

Question 1

Lustre is the shine of a material.

(a) What are Lustrous objects? Give examples

(b) What are non-lustrous objects? Give examples

(c) Name a non-metal that is lustrous in nature (HINT: it is the hardest known material).

(a) Lustrous materials are those materials that have shiny surfaces. For example, gold and silver.
(b) Non-lustrous substances are those that do not have a shiny surface. For example, wooden blocks, plastic sheets.
(c) Diamond is a non-metal that is lustrous in nature.