JEE (Engineering) Chemistry Mock Test
8 free timed sets Ā· 325 questions Ā· 2 easy / 212 moderate / 111 hard Ā· solutions for every question
All Chemistry sets
Sample Chemistry questions
1. The atomic number of carbon is:
- (A) 6
- (B) 12
- (C) 8
- (D) 14
Show answer
(A) 6. Concept: Atomic number (Z) = number of protons in the nucleus; it defines the element. Formula: Mass number A = protons + neutrons; for Ā¹Ā²C, A = 12, Z = 6, neutrons = 6. Why A is correct: Carbon has 6 protons, so Z = 6; electronic configuration 1sĀ² 2sĀ² 2pĀ². Why others are wrong: - B) 12 is the mass number of the common isotope, not the atomic number. - C) 8 is oxygen; D) 14 is silicon (Z = 14) or the mass number of the C-14 isotope. Remember: Z stays fixed for an element; A changes between isotopes (C-12, C-13, C-14). Mnemonic for first 10: H He Li Be B C N O F Ne.
2. PCl3(g) + Cl2(g) ā PCl5(g) ĪH = -92.5 kJ/mol In which of the following ways could the reaction above be manipulated to create more product?
- (A) Decreasing the concentration of PCl3
- (B) Increasing the temperature
- (C) None of the above
- (D) Increasing the pressure
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(D) Increasing the pressure. Correct answer: Increasing the pressure.
3. Which of the following is (are) characteristic of mass spectrometry? I. Analyte molecules are converted to gaseous ions. II. The ions are separated according to their mass-to-charge ratio. III. In addition to compound identification, mass spectra can be utilized to determine precise isotopic masses and isotopic ratios.
- (A) II only
- (B) I and II only
- (C) I and III only
- (D) I, II, and III
Show answer
(D) I, II, and III. Correct answer: I, II, and III.
JEE (Engineering) Chemistry ā FAQs
Is the JEE (Engineering) Chemistry mock test free?
Yes. All 8 Chemistry sets are free, need no signup, and give instant scores with a solution for every question.
How many Chemistry questions are there for JEE (Engineering)?
325 questions across 8 sets: 2 easy, 212 moderate and 111 hard.
Will I get the same questions again?
No. Each attempt draws a fresh random subset, shuffles the order and options, and prefers questions you have not seen on this device. The Surprise Set draws from the whole subject pool.
Can I choose difficulty and timer?
Yes ā pick Easy, Moderate, Hard or Mixed, and choose no timer, 10 or 20 minutes, or the real exam pace.