CBSE Class 11 Chemistry Some Basic Concepts of Chemistry MCQs

Refer to CBSE Class 11 Chemistry Some Basic Concepts of Chemistry MCQs provided below. CBSE Class 11 Chemistry MCQs with answers available in Pdf for free download. The MCQ Questions for Class 11 Chemistry with answers have been prepared as per the latest syllabus, CBSE books and examination pattern suggested in Class 11 by CBSE, NCERT and KVS. Multiple Choice Questions for Chapter 1 Some Basic Concepts of Chemistry are an important part of exams for Class 11 Chemistry and if practiced properly can help you to get higher marks. Refer to more Chapter-wise MCQs for CBSE Class 11 Chemistry and also download more latest study material for all subjects

MCQ for Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry

Class 11 Chemistry students should refer to the following multiple-choice questions with answers for Chapter 1 Some Basic Concepts of Chemistry in Class 11. These MCQ questions with answers for Class 11 Chemistry will come in exams and help you to score good marks

Chapter 1 Some Basic Concepts of Chemistry MCQ Questions Class 11 Chemistry with Answers

Question: A mixture of sand and iodine can be separated by

a) sublimation

b) crystallisation

c) distillation

d) fractionation

Answer: sublimation

 

Question: Difference in density is the basis of

a) gravity separation

b) molecular sieving

c) ultrafiltration

d) molecular attraction

Answer: gravity separation

  

Question: Which of the following is an example of a heterogeneous substance?

a) Candle

b) Pieces of copper

c) Table salt

d) Bottled water

Answer: Candle

 

Question: Which of the following substances cannot be separated in

a) Solid glucose

b) Salt and sugar

c) Sugar and water solution

d) None of these

Answer: Solid glucose

 

Question: Which of the following statements about a compound is incorrect?

a) A compound retains the physical properties of its constituent elements.

b) The ratio of atoms of different elements in a compound is fixed

c) A compound cannot be separated into its constituent elements by physical methods of separation.

d) A molecule of a compound has atoms of different elements.

Answer: A compound retains the physical properties of its constituent elements.

 

Question: A mixture contains two or more substances in ________which are called its ________.

a) any ratio, components

b) fixed ratio, elements

c) any ratio, elements

d) fixed ratio, compounds

Answer: any ratio, components

 

Question: Which one of these is not a pure compound?

a) Sucrose solution

b) H2O2

c) O3

d) H2O

Answer: Sucrose solution

 

Question: One fermi is

a) 10–13 cm

b) 10–12 cm

c) 10–15 cm

d) 10–10 cm

Answer: 10–13 cm

 

Question: The prefix 1018 is

a) exa

b) giga

c) kilo

d) nano

Answer: exa

 

Question: The prefix zepto stands for (in m)

a) 10–21

b) 10–12

c) 109

d) 10–15

Answer: 10–21

 

Question: Which has highest weight ?

a) 1 m3 of water

b) 10 litre of Hg

c) A normal adult man

d) All have same weight

Answer: 1 m3 of water

 

Question: Which one of the following set of units represents the smallest and largest amount of energy respectively?

a) eV and L-atm

b) erg and cal

c) J and erg

d) cal and eV

Answer: eV and L-atm

 

Question: A measured temperature on Fahrenheit scale is 200 °F. What will this reading be on Celsius scale ?

a) 93.3 °C

b) 40° C

c) 94° C

d) 30° C

Answer: 93.3 °C

 

Question: Which of the following is not a SI unit?

a) litre

b) candela

c) metre

d) mole

Answer: litre

 

Question: The prefix 10–24 is

a) yocto

b) yotta

c) zeta

d) zepto

Answer: yocto

 

Question: Many countries use Fahrenheit scale for expressing temperature of atmosphere. If temperature in any such country is measured 41°F then what is its value in celcius scale and would you expect hot or cold atmosphere in that country?

a) 5°C, cold

b) 15°C, cold

c) 25°C, normal

d) 41°C, hot

Answer: 5°C, cold

 

Question: A sample was weighted using two different balances. The results were

(i) 3.929 g (ii) 4.0 g

How would the weight of the sample be reported?

a) 3.9 g

b) 3.93 g

c) 3g

d) 3.929 g

Answer: 3.9 g

 

Question: 0.00016 can be written as ____A ____ in scientific notaiton. Here, A refers to

a) 1.6 × 10–4

b) 24.50 × 10–9

c) 24.50 × 10–7

d) 2.450 × 10–8

Answer: 1.6 × 10–4

 

Question: If the true value for an experimental result is 6.23 and the results reported by three students X, Y and Z are :

X : 6.18 and 6.28

Y : 6.20 and 6.023

Z : 6.22 and 6.24

Which of the following option is correct :

a) Both X & Y neither precise nor accurate, Z both precise and accurate.

b) Both X & Z precise & accurate, Y not precise

c) X precise and accurate, Y not precise, Z precise

d) X precise, Y accurate, Z precise and accurate

Answer: Both X & Y neither precise nor accurate, Z both precise and accurate.

 

Question: The number of significant figures for the three numbers 161 cm, 0.161 cm, 0.0161 cm are

a) 3,3 and 3 respectively

b) 3,4 and 4 respectively

c) 3,4 and 5 respectively

d) 3,3 and 4 respectively

Answer: 3,3 and 3 respectively

 

 

 

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 __________.

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