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Lakhmir Singh & Manjit Kaur - Chemistry

Very Short Answer Type Questions-Pg-220

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Short Answer Type Questions-Pg-221

22 A 22 B 22 C 23 A 23 B 24 A 24 B 25 A 25 B 25 C 26 A 26 B 27 A 27 B 28 A 28 B 28 C 29 30 A 30 B 31 A 31 B 32 A 32 B 32 C 33 A 33 B 34 A 34 B 35 A 35 B 35 C 35 D

Long Answer Type Questions-Pg-222

36 A 36 B 36 C 36 D 37 A 37 B 37 C 37 D 38 A 38 B 38 C 38 D 39 A 39 B 39 C 39 D 39 E

Multiple Choice Questions (MCQs)-Pg-223

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Questions Based on High Order Thinking Skills (HOTS)-Pg-224

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Very Short Answer Type Questions-Pg-239

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Short Answer Type Questions-Pg-240

26 26 26 C 27 28 A 28 B 28 C 29 A 29 B 29 C 30 A 30 B 30 C 31 A 31 B 31 C 32 A 32 B 32 C 33 A 33 B 33 C 34 A 34 B 34 C 35 A 35 B 35 C 36 A 36 B 36 C 37 A 37 B 37 C

Long Answer Type Questions-Pg-241

38 A 38 B 38 C 38 D 38 E 39 A 39 B 39 C 39 D 39 E 40 A 40 B 40 C 40 D 40 E

Multiple Choice Questions (MCQs)-Pg-242

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Questions Based on High Order Thinking Skills (HOTS)-Pg-243

Very Short Answer Type Questions-Pg-262

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Short Answer Type Questions-Pg-263

22 23 24 A 24 B 24 C 25 A 25 B 25 C 26 A 26 B 26 C 27 28 29 A 29 B 30 31 A 31 B 31 C 32 A 32 B 32 C 32 D 33 A 33 B 34 A 34 B 35 A 35 B 35 C 36 A 36 B 36 C 37 A 37 B 37 C 38 A 38 B 38 C 39 A 39 B 39 C 40 A 40 B 41 A 41 B 41 C 42 A 42 B 42 C 43 A 43 B 43 C 44 A 44 B 44 C 45 A 45 B 45 C

Long Answer Type Questions-Pg-265

46 A 46 B 47 A 47 B 48 A 48 B 48 C 49 A 49 B 49 C

Multiple Choice Questions (MCQs)-Pg-265

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Questions Based on High Order Thinking Skills (HOTS)-Pg-266

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Q. 604.8( 6 Votes )

A solid element X has four electrons in the outermost shell of its atom. An allotrope Y of this element is used as a dry lubricant in machinery and also in making pencil leads. (a) What is element X?
(b) Name the allotrope Y?
(c) State whether allotrope Y is a good conductor or non-conductor of electricity.
(d) Name one use of allotrope Y (other than lubrication and pencil leads)
(e) Name two other allotropes of element X.

Class 10th Lakhmir Singh & Manjit Kaur - Chemistry 4. Carbon and Its Compounds

Answer :

(a) Element X is carbon.

(b) Allotrope Y is graphite.

(c) Allotrope Y is a good conductor of electricity (due to the presence of free electron).

(d) Allotrope Y is used for making electrodes of cells.

(e) Diamond and Buckministerfullerence are allotropes of element X.

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Give a reason why carbon can neither form C^{4 +} cations nor C^4— anxious, but forms covalent compounds which are bad conductors of electricity and have low melting and boiling points.

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An element E exist in three allotrope forms A, B and C. in allotrope A, the atoms of element E are joined to form a sheet like structure. In allotrope B, each atom of element E is surrounded by four other E atoms to form a rigid structure.

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(d) What is allotrope C?

(e) Which allotrope is used in making jewellery?

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Lakhmir Singh & Manjit Kaur - Chemistry

The solid element A exhibits the property of catenation. It is also present in the form of a gas B in the air which is utilized by plants in photosynthesis. An allotrope C of this element is used in glass cutters.

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