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

NCERT Class 11 Chapter 1 Chemistry Some Basic Concepts of Chemistry MCQ | Questions & Answers: Students of Class 11 should utilize this article about NCERT Class 11 Chapter 1 Chemistry Some Basic Concepts of Chemistry MCQ Quiz. Now, attempt the Mutliple Choice Questions regarding the Some Basic Concepts of Chemistry topic and know your final score.

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1. A mixture of sand and iodine can be separated by

A. sublimation

B. crystallization

C. distillation

D. fractionation

2. Difference in density is the basis of

A. gravity separation

B. molecular sieving

C. ultrafiltration

D. molecular attraction

3. Which of the following is an example of a heterogeneous substance?

A. Candle

B. Pieces of copper

C. Table salt

D. Bottled water

4. 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

5. 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.

6. 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

7. Which one of these is not a pure compound?

A. Sucrose solution

B. H₂O₂

C. O₃

D. H₂O

8. One fermi is

A. 10^–13 cm

B. 10^–12 cm

C. 10^–15 cm

D. 10^–10 cm

9. The prefix 10¹⁸ is

A. exa

B. giga

C. kilo

D. nano

10. The prefix zepto stands for (in m)

A. 10^–21

B. 10^–12

C. 10⁹

D. 10^–15

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11. Which has highest weight ?

A. 1 m³ of water

B. 10 liter of Hg

C. A normal adult man

D. All have same weight

12. 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

13. 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

14. Which of the following is not a SI unit?

A. kilogram

B. Newton

C. atomic mass unit

D. mole

15. The prefix 10^–24 is

A. yocto

B. yotta

C. zeta

D. zepto

16. 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

17. 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

18. 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

19. 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

20. 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

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21. Approximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of element would be

A. 26.89

B. 8.9

C. 17.8

D. 26.7

22. The number of moles present in 6 gms of carbon is:

A. 2

B. 0.5

C. 5

D. 1

23. What is the concentration of nitrate ions if equal volumes of 0.1 M AgNO₃ and 0.1 M NaCl are mixed together

A. 0.1 N

B. 0.2 M

C. 0.05 M

D. 0.25 M

24. The -ve charged particles is called:

A. Anion

B. Cation

C. Radical

D. Atom

25. Which is not a unit of pressure:

A. Bar

B. N/m²

C. Kg/m²

D. Torr