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

Lakhmir Singh & Manjit Kaur - Chemistry

Very Short Answer Type Questions-Pg-220

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

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

40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59

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

60 61 62 63 64 65 66 67 68 69 70

Very Short Answer Type Questions-Pg-239

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

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

41 42 43 44 45 46 47 48 49 50 51 52 53 54 55

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

Very Short Answer Type Questions-Pg-262

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 8 19 20 21

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

50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65

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

66 67 68 69 70 71 72 73 74 75

Q. 40 D5.0( 2 Votes )

Describe how petroleum was formed in the earth.

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

Answer :

Millions of years ago, the microscopic plants and animals which lived under the sea died and their bodies were covered with mud and sand at the bottom of the sea. In the absence of air or oxygen, the chemical effects of pressure, heat and bacteria converted these remains into petroleum oil and natural gas. The petroleum thus formed got trapped between two layers of impervious rocks (non-porous rocks) forming an oil trap.

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