CBSE Class 11 Chemistry Some Basic Concepts of Chemistry MCQs

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)

28. When a substance that has absorbed energy emits it in the form of radiation the spectrum obtained is__________.(Continuous Spectrum, Line Spectrum, Emission Spectrum)

29. __________ of the overlap forms strong bond.(s-s, p-s, p-p)

30. __________ compound has a greater angle between a covalent bond.(H2O, NH3, CO2)

31. When sodium chloride is mixed in water then __________.(pH is changed, NaOH and HCl are formed, Sodium and chloride ions become hydrated)

32. The boiling point of a liquid __________ with an increase in pressure.(Decreases, Increases, remains constant)

33. An Azimuthal Quantum Number describes the __________.(size of an atom, shape of an orbital, spin of orbital)

34. The rate of the backward reaction is directly proportional to the product of the molar concentration of __________.(Reactants, Products, None of them)


II. Fill in the Blank

1. The property of a crystal, which is different in different directions, is called __________.

2. 0.00051 contains __________ significant figures.

3. The oxidation number of oxygen in OF2 is __________.

4. The volume of 1 gm of hydrogen gas at S.T.P is __________.

5. The oxidation number Mn in KMnO4 is __________.

6. The product of ionic concentration in a saturated solution is called __________.

7. 16 gm of oxygen at S.T.P occupies a volume of __________ dm3.

8. The shape of the orbital for which l = 0 is __________.

9. The radius of Cl-1 is __________ than the radius of Cl0.

10. sp2 hybridization is also known as __________.

11. The value of 1 Debye is __________.

12. The reactions catalyzed by sunlight are called __________.

13. The blue colour of CuSO4 is due to the presence of __________.

14. The force of attraction between the liquid molecules and the surface of container is called __________.

15. The heat of neutralization of a strong acid and a strong base is __________.

16. C º C triple bond is __________. C = C double bond length.

17. The ions having the same electronic configuration are called iso electronic.

18. On heating, if a solid changes directly into vapours without changing into the liquid state, the phenomenon is called __________.

19. Each orbital in an atom can be completely described by __________.

20. In a molecule of alkene, __________ restricts the rotation of the group of atoms at either end of the molecule.

21. Density, refractive index and vapour pressure are __________ properties.

22. The addition of HCl to H2 solution __________ the ionization of H2S.

23. The reaction of cation or anion (or both) with water so as to change its __________ is known as Hydrolysis.

24. A reaction with higher activation energy will start at __________ temperature.

25. 6.02 x 1023 has __________ significant figures.

26. The internal resistance in the flow of liquid is called __________.



Click to View or Download pdf file
Click for more Chemistry Study Material

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

FAQs CBSE Board Exam Results Class 10 and 12

FAQs CBSE Board Exam Results Class 10 and 12 Q.1. What does the term RT in the marksheet mean? Ans.The term RT means REPEAT IN THEORY. This is the term used from 2020 instead of FAIL IN THEORY(FT) Q.2. What does the term RP in the marksheet mean? Ans.The term RP means...

Cogito and The Question Book A series on Thinking skills by CBSE

The Board has dedicated this academic session 2020-21 for ‘Competency Based Learning’. Skills connected to Critical & Creative thinking, Problem Solving, Collaboration and Communication are core to successful living in the 21st Century. To focus on the importance...

Internal Assessments and CBSE Reduced Syllabus

CBSE on 7th July 2020 had announced the ‘Revised Academic Curriculum for classes IX-XII for the session 2020-21’ to mitigate the effect of face to face learning loss due to the closure of schools to contain COVID-19 Pandemic. The rationalization of syllabus up to 30% ...

CBSE Reduced Syllabus Class 9 and 10

The prevailing health emergency in the country and at different parts of the world as well as the efforts to contain the spread of Covid-19 pandemic has resulted in loss of class room teaching due to closure of schools. Therefore the CBSE Board has decided to revise...

CBSE Decision on Board Exam 2020

The Class 10 and 12 exams are cancelled, and results for both 10th and 12th would be declared by July 15 based on internal exams. CBSE Class 12 students would have the option to appear for the exams at a later date. CBSE has a scheme in which marks scored in past 3...

Studies Today