Please wait...

Chemistry Test 207
Result
Chemistry Test 207

  • /

    Score

  • -

    Rank
Time Taken: -
  • Question 1/10
    4 / -1

    K₄[Fe(CN)₆] is a

  • Question 2/10
    4 / -1

    What are the products formed in the reaction of xenon hexafluoride with silicon dioxide

  • Question 3/10
    4 / -1

    The hardness of transition elements is due to their

    Solutions

    Transition elements show metallic character as they have low ionization energies and have several vacant orbitals in their outermost shell. This property favors the formation of metallic bonds in the transition metals and so they exhibit typical metallic properties.These metals are hard which indicates the presence of covalent bonds. This happens because transition metals have unpaired d-electrons. The d-orbital which contains the unpaired electrons may overlap and form covalent bonds. Higher the number of unpaired electrons present in the transition metals, more is the number of covalent bonds formed by them. This further increases the hardness of the metal and its strength.

     

  • Question 4/10
    4 / -1

    Sodium nitroprusside reacts with sulphide ion to give a purple colour due to the formation of :

  • Question 5/10
    4 / -1

    To a solution containing equimolar mixture of sodium acetate and acetic acid, some more amount of sodium acetate solution is added. The pH of mixture solution

  • Question 6/10
    4 / -1

    The reason for geometrical isomerism by 2-butene is

  • Question 7/10
    4 / -1

    If chloroform is left open in air in presence of sun rays

  • Question 8/10
    4 / -1

    Ionisation potential of hydrogen is

    Solutions

    Hydrogen has higher ionisation potential than chlorine, because hydrogen has only one electron and small size. This electron experiences the direct attraction of the nucleus and there is no shielding effect. Whereas in Cl the combined effect of the increase in the atomic size and the screening effect more than compensates the effect of the increased nuclear charge. Consequently, the valence electrons become less firmly held by the nucleus and ionisation potential decreases.

     

  • Question 9/10
    4 / -1

    Which is an example of thermosetting polymer?

  • Question 10/10
    4 / -1

    KO2 (potassium super oxide) is used in oxygen cylinders in space and submarines because it

    Solutions

    Because it absorbs CO2 and increases O2 concentration according to the following reaction

    4KO2 + 2CO2 → 2K2CO3 + 3O2

     

User Profile
-

Correct (-)

Wrong (-)

Skipped (-)

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
Get latest Exam Updates
& Study Material Alerts!
No, Thanks
Click on Allow to receive notifications
×
Open Now