CBSE Class 11 Chemistry MCQs - Some Basic Concepts of Chemistry CBSE and NCERT students can refer to the attached file. All educational material on the website has been prepared by the best teachers having more than 20 years of teaching experience in various schools. The study material available on our website for all CBSE classes and subjects have been prepared by teachers from all over the country. All study material has been carefully designed keeping into mind the latest CBSE examination trends.  

I. MCQ - Choose Appropriate Alternative

1. The process in which a solid directly changes to vapours without melting is called __________. (Evaporation, Condensation, Sublimation)

2. The oxidation number of P in PO3-4 is __________. (3+, 5+, 3-)

3. The pH of 0.001 M HCl is __________. (2, 4, 3)

4. K ( rate constant) is dependent on __________. (temperature, concentration, volume)

5. The universal indicator in water shows the colour __________. (red, green, blue)

6. The pH of blood is __________. (7.3, 8.4, 5.6)

7. The oxidation potential of hydrogen electrode is __________. (0.0 volt, +0.76volt, -0.36volt)

8. __________ quantum number describes the shape of a molecule. (Pricipal, Azimuthal, Spin)

9. An orbital can have the maximum number of two electrons but with opposite spin, it is called __________. (Pauli’s Exclusion Principle, Hund’s Rule, Aufbau Principle)

10. When a-particle is emitted from the nucleus of radioactive element, the mass number of the atom __________. (Increases, Decreases, Does not change)

11. Dissociation of KClO3 is a __________ process. (Reversible, Irreversible)

12. The e/m ratio of cathode rays is the __________ when Hydrogen is taken in the discharge tube. (Lowest, Highest)

13. The negative ion tends to expand with the __________ of negative change on it. (Decreases, Increases)

14. Ionic compounds have __________ melting points. (Low, High)

15. The allotropic forms of an element are called __________. (Polymorphs, Isomorphs)

16. Absolute Zero is equal to __________. (273.16°C, -273.16°C)

17. The compounds having hydrogen bond generally have __________ boiling points. (High, Low)

18. Surface tension __________ with the rise of temperature. (Increases, Decreases)

19. Mercury forms __________ meniscus in a glass tube. (concave, convex)

20. The reactions with the high value of energy of activation are __________. (slow, fast)

21. 2.000 has/have __________ significant figure(s). (1, 4)

22. E + PV is called __________. (Entropy, Enthalpy)

23. The shorter the bond length in a molecule, the __________ will be bond energy. (Lesser, Greater)

24. Positive rays are produced from __________. (Anode, Cathode, Ionization of gas in a discharge tube)

25. __________ of the following contains the fewer number of molecules. (1 gm of hydrogen, 4 gm of oxygen, 2 gm of nitrogen)

26. the true statement about the average speed of the molecules of hydrogen, oxygen and nitrogen confined in a container is __________. (Hydrogen is quicker, Oxygen is quicker, The molecules of all the gases have the same average speed)

27. The correct statement about the glass is __________. (It is crystalline solid, Its atoms are arranged in an orderly fashion, It is a super cooled liquid)

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