Don’t worry I will get the ONGC Chemistry syllabus and exam paper of aptitude reasoning section so that you can prepare hard for exam.

Here is the syllabus
GT Chemistry:
General Awareness –
Topics: History, Geography, Life Sciences, Economics, Political Science, Current Affairs, General Knowledge.

Aptitude Test - Verbal/ Non-verbal Reasoning Comprising of Reading Comprehension, Numerical Ability/ Quantitative Aptitude, Data Interpretation and more.

English syllabus : English UsageAnalogy, Spotting Errors, Sentence Improvement, Selecting Word, Sentence Arrangement, Synonyms, Antonyms, One Word Substitution, Idioms, Comprehensive

Concerned subject- General Engineering, Engineering Mechanics, Fluid Mechanics, Engineering Materials, Measurements, Thermodynamics, Induction Motors, Strength of Materials, Electrons and Photons, Electromagnetic and Magnetic circuits, A.C. Basics, D.C. Machines, Transformers, Synchronous Motors,Computers Engineering

Here is the Aptitude reasoning paper
1. If the following numbers are rewritten by interchanging the digits in ten’s place and hundred’s place and then arranging them in the descending order. What will be the second digit of the newly formed fifth number from your right ?
479, 736, 895, 978, 389, 675
(A) 3
(B) 4 (C) 5
(D) 6
Ans : (C)

2. P is 60 m South-East of Q. R is 60 m North-East of Q. Then R is in which direction of P ?
(A) North
(B) North-East
(C) South
(D) South-East
Ans : (A)

Directions—(Q. 3–5) Read the following information for answering the questions that follow—
On a playing ground A, B, C, D and E are standing as described below facing the North.
(i) B is 50 metres to the right of D.
(ii) A is 60 metres to the South of B

(iii) C is 40 metres to the West of D.
(iv) E is 80 metres to the North of A.

3. If a boy walks from C, meets D followed by B, A and then E, how many metres has he walked if he has travelled the straight distance all through ?
(A) 120
(B) 150
(C) 170
(D) 230
Ans : (D)

4. What is the minimum distance (in metre approximately) between C and E?
(A) 53
(B) 78
(C) 92
(D) 120
Ans : (C)

5. Who is to the South-East of the person who is to the left of D ?
(A) A
(B) B
(C) C
(D) E
Ans : (A)

6. A man was walking in the evening just before the sun set. His wife said that, his shadow fell on his right. If the wife was walking in the opposite direction of the man, then which direction the wife was facing ?
(A) North
(B) West
(C) South
(D) East
Ans : (C)

Directions—(Q. 7–11) In each of the following questions choose the set of numbers from the four alternative sets that is similar to the given set.

7. Given set : (4, 9, 18)
(A) (8, 14, 22)
(B) (10, 15, 25)
(C) (6, 12, 23)

(D) (12, 17, 26)
Ans : (D)

8. Given set : (10, 14, 17)
(A) (4, 11, 14)
(B) (9, 12,
(C) (8, 13, 18)
(D) (6, 9, 12)
Ans : (A)

9. Given set : (7, 27, 55)
(A) (21, 35 , 52)
(B) (18, 42 , 65)
(C) (16, 40 , 72)
(D) (13, 30 , 58)
Ans : (C)

10. Given set : (39, 28, 19)
(A) (84, 67 , 52)
(B) (52, 25 , 17)
(C) (70, 49 , 36)
(D) (65, 45 , 21)
Ans : (A)

11. Given set : (246, 257, 358)
(A) (233, 343, 345)
(B) (273, 365, 367)
(C) (143, 226, 237)
(D) (145, 235, 325)
Ans : (A)

Directions—(Q. 12–16) Each question contains six or seven statements followed by four sets of combinations of three. Choose the set in which the statements are logically related.

12.
(1) All books are having pages.
(2) All kings are having pages.
(3) All kings are books.
(B) 4, 2, 6
(C) 1, 5, 3
(D) 2, 4, 5
Ans : (B)

Directions—(Q. 17–21) Each of the questions below consists of a question and two statements numbered (I) and (II). You have to decide whether the data provided in the statements are sufficient to answer the question. Give answers—
(A) If the data in statement (I) alone are sufficient to answer the question, while the data in statement (II) alone are not sufficient to answer the question;
(B) If the data in statement (II) alone are sufficient to answer the question, while the data in statement (I) alone are not sufficient to answer the questions;
(C) If the data even in both statements (I) and (II) together are not sufficient to answer the question;
(D) If the data in both statement (I) and (II) together are necessary to answer the question.

17. In which direction is Mahatmaji’s statue facing ?
I. The statue is towards the northern end of the city.
II. The statue’s shadow falls towards East at 5 O’clock in the evening.
Ans : (C)

18. What is the total number of pupils in the final year class ?
I. The number of boys in the final year class is twice as much as the number of girls in that class.
II. The sum of the ages of all the pupils in the class is 399 years and their average age is 19 years.
Ans : (B)

19. Who is the tallest among A, B, C and D ?
I. A is taller than C.
II. B is taller than C and D.
Ans : (C)

20. How many Sundays are there in a particular month of a particular year?
I. The month begins on Monday.
II. The month ends on Wednesday.
Ans : (D)