Chemistry Quiz - Competitive Exams JEE

Free practice quiz: Chemistry (Competitive Exams JEE). 72 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This Competitive Exams JEE practice quiz has 72 multiple-choice questions on Chemistry. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which quantum number determines the shape of an orbital?

   1. Spin (s)
   2. Azimuthal (l)
   3. Magnetic (m)
   4. Principal (n)
   Show answer

   Answer: B. Azimuthal (l)

2. The pH of a 0.001 M HCl solution is?

   1. 1
   2. 11
   3. 3
   4. 2
   Show answer

   Answer: C. 3

3. The correct order of increasing energy of orbitals according to the (n + l) rule is:

   1. 4s < 3d < 4p
   2. 3d < 3p < 4s
   3. 3d < 4s < 4p
   4. 4p < 3d < 4s
   Show answer

   Answer: A. 4s < 3d < 4p

4. The conjugate base of HSO4- is:

   1. SO3
   2. SO42-
   3. H2SO4
   4. OH-
   Show answer

   Answer: B. SO42-

5. Which of the following compounds gives a positive Tollens' test?

   1. Benzene
   2. Acetone
   3. Diethyl ether
   4. Acetaldehyde
   Show answer

   Answer: D. Acetaldehyde

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which element has the highest electronegativity?
2. Which of the following molecules is nonpolar?
3. The number of atoms present in one mole of a substance is equal to?
4. Which of the following is an intensive property?
5. The first law of thermodynamics is a consequence of conservation of?
6. According to Le Chatelier's principle, increasing the pressure on a system at equilibrium shifts the equilibrium in the direction of?
7. The oxidation number of oxygen in H2O2 is?
8. The IUPAC name of CH3-CH2-OH is?
9. Which of the following is a noble gas?
10. The number of unpaired electrons in Fe3+ ion (atomic number 26) is?
11. The hybridization of carbon atoms in graphite is?
12. What is the molarity of a solution prepared by dissolving 5.85 g of NaCl in enough water to make 500 mL of solution? (Molar mass NaCl = 58.5 g/mol)
13. For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), increasing the pressure will?
14. Which of the following aqueous solutions will have the highest boiling point? (Assume complete dissociation)
15. The half-life of a first-order reaction is independent of?
16. The addition of HBr to propene in the presence of peroxides follows?
17. Which of the following is an amphoteric oxide?
18. The oxidation state of chromium in K2Cr2O7 is?
19. The de Broglie wavelength (in Å) of an electron accelerated through a potential difference of V volts is given by?
20. The number of sigma and pi bonds in benzene (C6H6) are respectively?
21. The solubility product (Ksp) of AgCl if its solubility is 1.34 × 10^-5 M is?
22. The equivalent weight of KMnO4 in acidic medium (molar mass = M) is?
23. In the Arrhenius equation, a plot of ln k versus 1/T gives a straight line with slope equal to?
24. Which of the following transitions in a hydrogen atom emits a photon of the shortest wavelength?
25. The energy of an electron in the first Bohr orbit of a hydrogen atom is -13.6 eV. What is its energy in the second orbit?
26. Which set of quantum numbers is NOT permissible for an electron in an atom?
27. The number of radial nodes in a 3p orbital is:
28. Which of the following is the correct order of ionic radii?
29. The first ionization enthalpy is highest for which of the following elements?
30. Which of the following molecules has a trigonal planar geometry?
31. In the molecule SF6, the hybridization of the sulfur atom is:
32. Which of the following has the highest bond order?
33. The dipole moment of which of the following molecules is zero?
34. According to Molecular Orbital Theory, which species is paramagnetic?
35. The compressibility factor (Z) for an ideal gas is:
36. At constant temperature, the pressure of a fixed amount of gas is inversely proportional to its volume. This is known as:
37. For an isothermal reversible expansion of an ideal gas, which of the following is true?
38. The standard enthalpy of formation of an element in its most stable form is:
39. A reaction is spontaneous at all temperatures if:
40. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), the relation between Kp and Kc is:
41. A buffer solution of pH = pKa is prepared. The ratio of the concentration of the conjugate base to the weak acid is:
42. The van't Hoff factor (i) for a dilute aqueous solution of K2SO4 assuming complete dissociation is:
43. Which of the following is a colligative property?
44. The order of a reaction whose rate constant has units of mol L^-1 s^-1 is:
45. In a zero-order reaction, a plot of concentration of reactant versus time gives a straight line with slope equal to:
46. The correct IUPAC name of the compound (CH3)2CH-CH2-CHO is:
47. Which of the following is the correct order of increasing first ionization enthalpy?
48. Which element has the highest electron gain enthalpy?
49. Which of the following pairs constitutes a pair of isotopes?
50. The number of significant figures in 0.00250 is:
51. In the reaction 2FeCl3 + SnCl2 → 2FeCl2 + SnCl4, the oxidizing agent is:
52. Which of the following is an example of a disproportionation reaction?
53. Which of the following is the most stable carbocation?
54. The reaction of an aldehyde with a primary amine gives:
55. Which of the following is a chain-termination step in the free-radical chlorination of methane?
56. Which isomer of C4H10 has the highest boiling point?
57. Which of the following complexes is expected to be diamagnetic?
58. The lanthanoid contraction is responsible for:
59. Which of the following statements about transition metals is correct?
60. The general electronic configuration of actinoids is:

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