CBSE Class 11 Chemistry Some Basic Concepts of Chemistry MCQs Set B

 

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


More Questions...............................

 

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

 

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